electric switch locks sl-25/sl-26 - hitachi rail...1.2. introduction the sl-25 and sl-26 electric...

SM 5466 1000 Technology Drive, Pittsburgh, PA 15219 645 Russell Street, Batesburg, SC 29006

Electric Switch Locks

SL-25/SL-26

♦ Installation ♦ Operation

♦ Maintenance

Electric Switch Locks SL-25/SL-26

Copyright 2019 SM 5466 Rev. 1, March 2019


Copyright 2019 SM 5466 Rev 1, March 2019 i

Proprietary Notice This document and its contents are the property of Hitachi Rail STS USA, Inc. (formerly known as Union Switch & Signal Inc., and hereinafter referred to as "STS USA"). This document is furnished to you on the following conditions: 1.) That no proprietary or intellectual property right or interest of STS USA is given or waived in supplying this document and its contents to you; and, 2.) That this document and its contents are not to be used or treated in any manner inconsistent with the rights of STS USA, or to its detriment, and are not to be copied, reproduced, disclosed or transferred to others, or improperly disposed of without the prior written consent of STS USA.

Important Notice STS USA constantly strives to improve our products and keep our customers apprised of changes in technology. Following the recommendations contained in the attached service manual will provide our customers with optimum operational reliability. The data contained herein purports solely to describe the product, and does not create any warranties. Within the scope of the attached manual, it is impossible to take into account every eventuality that may arise with technical equipment in service. Please consult an STS USA local sales representative in the event of any irregularities with our product. STS USA expressly disclaims liability resulting from any improper handling or use of our equipment, even if these instructions contain no specific indication in this respect. We strongly recommend that only approved STS USA spare parts are used as replacements.

Copyright© 2019, Hitachi Rail STS USA, Inc. 1000 Technology Drive, Pittsburgh, PA USA 15219-3120

645 Russell Street, Batesburg, SC 29006 sts.hitachirail.com All rights reserved.

http://www.sts.hitachirail.com/


Copyright 2019 SM 5466 Rev 1, March 2019 ii

Revision History REV. ISSUE DATE REVISION DESCRIPTION

0 January 1992 Original Issue 1 March 2019 Hitachi Rail STS Branding


Copyright 2019 SM 5466 Rev 1, March 2019 iii

Table of Contents 1. GENERAL INFORMATION ............................................................................................................... 1-1

1.1. Scope of Manual ....................................................................................................................... 1-1 1.2. Introduction ............................................................................................................................... 1-1 1.3. Optional Features ..................................................................................................................... 1-2

1.3.1. Emergency Key Release Unit ....................................................................................... 1-2 1.3.2. Light Indicator Unit ........................................................................................................ 1-3 1.3.3. Link for Double Padlocking ........................................................................................... 1-3 1.3.4. Heater ........................................................................................................................... 1-3

1.4. Major Assemblies ..................................................................................................................... 1-3 2. INSTALLATION ................................................................................................................................. 2-1

2.1. General ..................................................................................................................................... 2-1 2.2. Mounting ................................................................................................................................... 2-1

3. OPERATION ...................................................................................................................................... 3-1 3.1. Status indicator ......................................................................................................................... 3-1 3.2. Basic Operation ........................................................................................................................ 3-1 3.3. Detailed Operation .................................................................................................................... 3-1

3.3.1. Removing the Padlock .................................................................................................. 3-1 3.3.2. Removing the Hand Throw Lever ................................................................................. 3-4 3.3.3. Replacing the Hand Throw Lever ................................................................................. 3-4 3.3.4. Replacing the Padlock .................................................................................................. 3-5 3.3.5. Resetting the Emergency Key Release Latch .............................................................. 3-5

4. MAINTENANCE AND TEST PROCEDURES ................................................................................... 4-1 4.1. General ..................................................................................................................................... 4-1 4.2. PREVENTIVE MAINTENANCE ................................................................................................ 4-1

4.2.1. Cleaning ........................................................................................................................ 4-1 4.2.1.1. Recommended Cleaning Equipment and Materials (or equivalent) .............. 4-1 4.2.1.2. Procedure ....................................................................................................... 4-1

4.2.2. Inspection ...................................................................................................................... 4-1 4.2.3. Lubrication .................................................................................................................... 4-2

4.2.3.1. Recommended Lubrication Equipment and Materials (or equivalent) ........... 4-2 4.2.3.2. SL-25 and SL-26 Switch Lock Lubrication Procedure ................................... 4-2

4.3. Field Checks and Corrective Field Maintenance ...................................................................... 4-3 4.3.1. Magnet Coils and Back Strap ....................................................................................... 4-3 4.3.2. Armature ....................................................................................................................... 4-3 4.3.3. Armature Bracket and Bearings.................................................................................... 4-3 4.3.4. Armature-Operated Contacts ........................................................................................ 4-4 4.3.5. Pick-Up and Drop-Away Voltages for Armature ........................................................... 4-4 4.3.6. Armature Bar Depressor ............................................................................................... 4-5 4.3.7. Depressor Spring .......................................................................................................... 4-5 4.3.8. Contact Operating Lever ............................................................................................... 4-5 4.3.9. Lock Dog Clearance ..................................................................................................... 4-5 4.3.10. Cam-Operated Contacts (SL-25 Only) ......................................................................... 4-6


Copyright 2019 SM 5466 Rev 1, March 2019 iv

4.3.11. Cam-Operated Contacts (SL-25 with Emergency Key Release and Latch) ................ 4-7 4.3.12. Cam-Operated Contacts (SL-26 Only) ......................................................................... 4-7 4.3.13. Overall Check of Mechanism ........................................................................................ 4-8 4.3.14. Indicator ........................................................................................................................ 4-8 4.3.15. Lever Lock Rod ............................................................................................................. 4-9 4.3.16. Key Release.................................................................................................................. 4-9 4.3.17. Key Release Latch ........................................................................................................ 4-9

4.4. Shop Checks and Maintenance ................................................................................................ 4-9 4.4.1. Armature-Operated Contacts ........................................................................................ 4-9

4.4.1.1. Back Contact Adjustment ............................................................................. 4-10 4.4.1.2. Front Contact Adjustment ............................................................................ 4-10

4.4.2. Pick-Up and Drop-Away Voltages for Armature ......................................................... 4-11 4.4.2.1. Drop-Away Voltage ...................................................................................... 4-11 4.4.2.2. Direct Pick-Up and Working Voltages .......................................................... 4-12

5. RAIL TEAM AND TECHNICAL SUPPORT ...................................................................................... 5-1 APPENDIX-A. PARTS LIST ................................................................................................................ A-1

A.1 Switch Lock Variations ..............................................................................................................A-1 A.2 SL-25 Electric Lock Parts List ...................................................................................................A-6 A.3 SL-26 Electric Switch Lock Variations ......................................................................................A-9 A.4 SL-26 Electric Switch Lock Parts list ......................................................................................A-12


Copyright 2019 SM 5466 Rev 1, March 2019 v

List of Figures Figure 1-1. Switch Lock Name Plate .................................................................................................. 1-2 Figure 1-2. SL-25/SL-26 Assemblies (1 of 3 ...................................................................................... 1-5 Figure 1-3. SL-25/SL-26 Assemblies (2 of 3) ..................................................................................... 1-6 Figure 1-4. SL-25/SL-26 Assemblies (3 of 3) ..................................................................................... 1-7 Figure 1-5. Optional Key Release and Latch Components ................................................................ 1-9 Figure 2-1. SL25/SL26 Sample Layout .............................................................................................. 2-1 Figure 3-1. Padlocked Position........................................................................................................... 3-2 Figure 3-2. Intermediate (Locked) Position ........................................................................................ 3-3 Figure 3-3. Unlocked Position ............................................................................................................ 3-3 Figure 3-4. Emergency Key Release Latch ........................................................................................ 3-6 Figure 4-1. Magnet Coil and Armature Assembly .............................................................................. 4-4 Figure 4-2. Contact Adjustment ........................................................................................................ 4-11 Figure A-1. SL-25 Electric Switch Lock ..............................................................................................A-3 Figure A-2. SL-25 Electric Switch Lock ..............................................................................................A-4 Figure A-3. SL-25 Electric Switch Lock ..............................................................................................A-5 Figure A-4. SL-26 Electric Switch Lock ............................................................................................A-10 Figure A-5. SL-26 Electric Switch Lock ............................................................................................A-11 Figure A-6. SL-26 Electric Switch Lock ............................................................................................A-12


Copyright 2019 SM 5466 Rev 1, March 2019 vi

List of Tables Table 1-1. SL25/SL-26 Assemblies and Functions ........................................................................... 1-3 Table 1-2. Key Release and Latch Components (See Figure 1-5) ................................................... 1-8 Table 4-1. Operating values for Magnet Assembly (External to the Lock Housing) ....................... 4-12 Table 4-2. Operating Values for Magnet Coils in Service ............................................................... 4-14 Table A-1. SL-25 Electric Switch Lock Variations .............................................................................A-1 Table A-2. SL-25 Electric Switch Lock Variations .............................................................................A-6 Table A-3. SL-26 Electric Switch Lock Variations .............................................................................A-9 Table A-4. SL-26 Electric Switch Lock Parts List ............................................................................A-12


Copyright 2019 SM 5466 Rev 1, March 2019 1-1

1. GENERAL INFORMATION 1.1. Scope of Manual This manual contains the installation, operation, and maintenance procedures for the SL-25 and SL-26 Electric Switch Locks. The corresponding STS USA part numbers are listed in Appendix A of this manual. For a list of SL-25 and SL-26 Electric Switch Locks currently manufactured, refer to the STS USA Price List Catalog. 1.2. Introduction The SL-25 and SL-26 Electric Switch Locks are low profile electric switch locks for locking the hand throw levers of switch machines or switch stands. The switch locks are equipped with a mechanical status indicator to display the various positions of the switch lock, i.e., locked, unlocked, or padlocked. The locks are also designed with a clearance low enough to allow installation between the rails, as required in some applications. The SL-25 and SL-26 are similar in both appearance and operation in many instances. A foot-operated latch with padlock is used to positively lock the hand throw lever of the switch machine. The locking device is a magnetically operated arm which inserts a lock dog in the path of a plunger attached to the foot latch. Circuit controllers are incorporated to indicate the status of the switch locks. The SL-25 is equipped with three light-duty contacts (2 normally-closed, 1 normally-open) for line control, and the SL-26 has six heavy-duty contacts (open in the padlocked position) for direct track shunting in non-electrified territory to generate an occupied indication in the track circuit. Both the SL-25 and SL-26 contain contacts to indicate the position of the magnet armature. Even though the switch locks are similar, there are differences between the SL-25 and SL-26. For example, the SL-26 lock has four external heavy-duty lugs for track connections, whereas the SL-25 lock does not have these lugs. The model number of the switch lock is identified on the escutcheon plate (See Figure 1-1) located on the inside of the cover. This plate lists the model number of lock, the STS USA part number, the resistance of the magnet coils, the minimum operating voltage, and instructions for setting the lever lock rod.



Figure 1-1. Switch Lock Name Plate

1.3. Optional Features See Figure 1-2, Figure 1-3, and Figure 1-4. 1.3.1. Emergency Key Release Unit As an optional feature, the SL-25 and SL-26 Switch Locks may be ordered with an emergency key release unit, either the Yale Key or Switchman's Key types. This key release unit allows a trainman to unlock the hand throw lever when the magnet coils are not energized. The key release unit may also be ordered with an optional latch-out feature. This key release latch provides positive indication whenever the emergency key release is used by latching the cam-operated contacts at their most restrictive indication. Resetting the latch to its unlatched position requires opening the cover of the switch lock. Whenever a trainman (who does not have access to the inside of the switch lock) uses the emergency key release, it is necessary to call a maintainer (who does have access to the inside of the lock) to reset the latch. When the latch is reset, the indication contacts will return to their normal indications. A seal may then be reapplied to the key release cover by the maintainer. The optional latch-out feature may also include a separate set of contacts. In this case, the latch operates and holds these separate contacts instead of operating the cam-operated contacts. This arrangement is shown in Figure 1-5. The operation of this

SWITCH LOCK MODEL NUMBER

ASTS USA PART NUMBER

RESISTANCE OF THE MAGNET COILS

MINIMUM OPERATING VOLTAGE

UN OHMS MIN. VOLTS

6G3.

0003

.00



arrangement is similar to that described above except that the latch bar operates only the separate contacts without moving behind the spring collar (H1). 1.3.2. Light Indicator Unit The optional light indicator unit is used to indicate that the magnet coils are energized. The lamp is wired into the magnet coil circuit. A pushbutton feature is also available for testing that the lamp is functioning properly. 1.3.3. Link for Double Padlocking The standard staple (STS USA Part Number M320232) may be replaced with a link (STS USA Part Number M298563) to accommodate the bails of two padlocks if double padlocking is desired. 1.3.4. Heater An optional heater can be ordered to prevent frost and condensation from forming on the indication contacts. 1.4. Major Assemblies See Figure 1-2, Figure 1-3, and Figure 1-4.

Table 1-1. SL25/SL-26 Assemblies and Functions Item Assembly Function(s)

A Foot Latch Releases the hand throw lever (N) Operates the plunger (C)

B Padlock Bail Passes through the staple to lock the foot latch (A)

C Plunger Connected to the foot latch (A) Moves the cam (G) to operate the cam follower (E) and the spring collar (H1)

D1 Spring Forces against spring the spring collars (H1 and H2) Urges the switch lock to the intermediate position

E Cam Follower Follows the movement of the cam (G) to lift the contact operating lever (F)

F Contact Operating Lever Moves the contacts based on the position of the cam follower (E) Lifts the rigid depressor (F1) to permit the armature bar (Q) to rotate

F1 Rigid Depressor Forces down against the armature bar (Q) to hold the armature in its deenergized position

G Cam Connected to the plunger (C) Moves the cam follower (E) Moves the spring collar (H1)

H1 Spring Collar

Contains the plunger spring (D1) Contacts the lock dog (J) to prevent operation of the latch (A) when the magnet coils are deenergized Supports the lock dog (J) when the foot latch (A) is fully open

H2 Spring Collar Contains the plunger spring (D1) Contacts the plunger (C) to urge the foot latch (A) to its intermediate position

J Lock Dog

Blocks the foot latch (A) from opening when the magnet coils are not energized Lifts via the armature bar (Q) to allow the foot latch (A) to open when the magnet coils are energized

K1 Lock Housing Acts as the mechanical end stop for the spring collar (H1) Guides the cam (G)

K2 Lock Housing Acts as the mechanical end stop for the spring collar (H2) Guides the plunger (C)



Item Assembly Function(s)

M Lever Lock Rod Holds the foot latch (A) in the fully open when the hand throw lever (N) is removed from the latch

N Hand Throw Lever Operates the switch machine or switch stand

P Depressor Spring Presses against the armature bar (Q) to hold the armature bar in its deenergized position

Q Armature Bar Lifts the lock dog (J) when the magnet coils are energized

R Guide Plate Contacts the stop flange of the lock dog (J) to limit the movement of the armature bar (Q) and lock dog Contacts the spring collar (H1) to limit the opening of the foot latch (A)

S Indicator Spring Bears against the lug (T2) of the indicator arm (T1) to display the message "PADLOCKED" Mounted on the contact operating lever (F)

T Indicator Plate Moves via the indicator arm (T1) to display the proper status message in the indicator aperture

T1 Indicator Arm Moves the indicator plate (T) to display the proper status message

T2 Indicator Lug Contacts the indicator spring (S) to move the indicator arm (T1) to display the message "PADLOCKED"

T3 Counterweight Biases the indicator arm (T1) towards the lock dog (J)

T4 Screw Contacts the lock dog (J) to move the indicator arm (T1) to display the message "UNLOCKED"

U Indicator Shield Limits the range of motion of the indicator plate (T)

V Contact Driver Connected to the contact operating lever (F) Operates the movable contact springs to indicate the status of the switch lock

V1 Fixed Contact Springs Make contact with the movable contact springs V2 Contact Spring Stops Prevents the fixed contact spring from bending too far WW, W1, W2 Shims Used to obtain proper alignment of components



Figure 1-2. SL-25/SL-26 Assemblies (1 of 3

V1

"CAM OPERATED" CONTACTS, 6 PROVIDED, 3 ONEACH SIDE OF CONTACT SPRING BOARD.

F1 P

W1QD2W V F

6 1/2

FIG 1DSTYLE SL-26 ELECTRIC LOCK

SHOWN IN LOCKED POSITION

W2

F

E

G

K1 H1 D1 H2 K2 C

J T3T1

T4R

ST

UT2

PADLO

CKED

M

N B

A

FIG 1APADLOCKED POSITION

6G3.

0004

.00



Figure 1-3. SL-25/SL-26 Assemblies (2 of 3)

LOCKED NT3 J

T1T4

RS

TU

T2

W2

F

E

G

K1 H1 D1 H2 K2 C

FIG 1BINTERMEDIATE (LOCKED) POSITION

M

A

Z1

Z2

Z3

FIG 1ESWITCHMANS KEY TYPE RELEASE

Z1

Z3

Z2FIG 1F

YALE KEY TYPE RELEASE

FIG 1JARMATURE OPERATED CONTACTS6G

3.00

05.0

0



Figure 1-4. SL-25/SL-26 Assemblies (3 of 3)

V

W FIG 1HSTYLE SL-25 ELECTRIC LOCK

SHOWN IN LOCKED POSITION

V

V2

FIG 1G"CAM OPERATED CONTACTS"

2 NORMALLY CLOSED AND 1NORMALLY OPEN

M

A

NUNLOCKEDT3 T1 T4 R S T U T2

H1 D1 H2 K2 C

J

W2

F

E

G

K1

FIG 1CUNLOCKED POSITION

6G3.

0006

.00



Table 1-2. Key Release and Latch Components (See Figure 1-5) Item Component Function(s)

L Finger

Mounted on the inside of the key release cover Extends through the keyhole plate (L1) and between the two lugs (L2) on

the keyhole cover Prevents the key release from turning when the switch lock cover is open

L1 Keyhole Plate Covers the key release lock mechanism L2 Lugs Used to mount the keyhole plate (L1) L3 Shims Adjust the position of the latch bar guide bracket (Y3) Y1 Trigger Arm Trips the latch bar (Y2) when the key release is turned Y2 Latch Bar Prevents the spring collar (H1) from closing against the lock housing (K1)

Y3 Latch Bar Guide Bracket Guides the latch bar (Y2) Provides a mounting point for the latch bar spring

Z1 Spring Moves the armature bar (Q) to the energized position when deflected via the spring cam (Z2)

Z2 Spring Cam Deflects the spring (21) when the key is turned in the key release Z3 Seal Holders Hold an optional seal on the key release cover



Figure 1-5. Optional Key Release and Latch Components

K1 L3

1/32

Y3 Y2Y1

POINT XH1

LL2

L2

Y2

Y1

Y3

LL1

CONTACTS

EMERGENCY KEY RELEASE LATCH

EMERGENCY KEY RELW=EASE LATCH USING SEPARATE CONTACTS

6G3.

0007

.00



2. INSTALLATION 2.1. General See Figure 2-1. A sample layout of the SL-25 or SL-26 Switch Lock is shown in Figure 2-1, where it is used to secure the hand throw lever of a T-20 Hand Operated Switch Machine. Although the switch lock is shown here in a single application outside the rails, it can also be used in tandem applications and can be mounted between the rails. Final details of a layout will be in accordance with approved railroad switch plans. The customer is provided with a detailed layout drawing, including installation dimensions and hardware requirements. Therefore, this manual presents only a typical layout drawing to illustrate the working relationship of the components. The customer should refer to his own layout drawing for specific layout information.

Figure 2-1. SL25/SL26 Sample Layout

2.2. Mounting The SL-25 and SL-26 Electric Switch Locks are installed by means of a mounting plate which is bolted to two or more ties. The mounting plate and switch lock should be aligned with the hand throw lever of the switch machine or switch stand so that the hand throw lever does not bind against its guide in the switch lock. The hold-down bolts may then be tightened.



After the hold-down bolts are tightened, the lever lock rod should be adjusted according to the instructions on the escutcheon plate located on the inside of the switch lock cover, i.e., the position of the lever lock rod should be adjusted so that there is 1/16 inch clearance between the end of the lever lock rod and the side of the foot latch. The beveled nose of the lever lock rod should engage the foot latch with a minimum of sideways thrust when the hand-throw lever is moved from normal if properly adjusted, i.e., there should be no significant binding as the lever lock rod slides into the locking position in the foot latch. Similarly, as the hand throw lever is returned to its normal position, the foot latch will be held open by the lever lock rod so that the hand throw lever may be returned to its guide. The recommended voltage across the magnet coils is stamped on the escutcheon plate (See Figure 1-1). This voltage may vary somewhat, due to field conditions, but it should always exceed the minimum recommended voltage. The pick-up and drop-away voltages should stay within the limits specified in Section 4.3.5. The screened elbow ventilators for the switch lock are wired inside the shipping housing. To install the ventilators, remove the thread protectors from the tapped holes and screw in the ventilators as far as possible. The screen must point downward in the final position.



3. OPERATION 3.1. Status indicator The status indicator displays one of three messages to indicate the status of the switch lock:

PADLOCKED The switch lock is in the padlocked position. LOCKED The padlock has been removed and the switch lock is in its

intermediate position. The magnet coils are deenergized. UNLOCKED The magnet coils are energized and the foot latch may be pressed

down to unlock the hand throw lever. 3.2. Basic Operation

1. Remove the padlock from its staple. 2. Push down on the foot latch. 3. Lift the hand throw lever. 4. When finished, replace the hand throw lever. 5. Step on the top portion of the foot latch to access the padlock staple. 6. Replace the padlock in its staple.

3.3. Detailed Operation 3.3.1. Removing the Padlock The removal of the padlock (B) from its staple allows the foot latch (A) and connected plunger (C) to move from the padlocked position shown in Figure 3-1 to the intermediate position shown in Figure 3-2. The plunger (C) moves to the intermediate position as a result of the force of spring (D1). The spring is contained between spring collars (H1) and (H2), which bear against the shoulders of the lock housings (K1) and (K2) to determine the intermediate position. When the plunger (C) moves from its padlocked position to the intermediate position, the cam (G) lifts the cam follower (E). The cam follower (E) is connected to the contact operating lever (F). Thus the movement of the cam follower (E) causes a counter-clockwise rotation (viewed from the latch side) of the contact operating lever (F). If the magnet coils are not energized, the contact operating lever (F) lifts the indicator spring (S), allowing the indicator arm (T) to drop back until it contacts the indicator shield (U). This position of the indicator arm displays the message "LOCKED" in the status indicator window. In addition to changing the status indication, the contact operating lever (F) pulls down on the contact driver (V) to operate the contacts. The contact operating lever (F) also



lifts the depressor (Fl) which normally presses down on the armature bar (Q). Therefore, the armature bar (Q) is free to move when the magnet coils are energized. If the magnet coils are not energized, the lock dog (J) is positioned between the stop (R) and the spring collar (H1). The lock dog blocks further movement of the plunger (C), which prevents the foot latch from being pressed down. If the magnet coils are already energized when the padlock is removed from the switch lock, the armature bar (Q) rotates clockwise (viewed from the latch side) to lift the lock dog (J) from its position between the stop (R) and the spring collar (H1) as shown in Figure 3-3. The lock dog (J) is lifted clear to allow the operation of the foot latch so that the hand throw lever may be removed from the switch lock. The lock dog (J) also lifts the indicator assembly (T1) to force the indicator arm (T) so that the message "UNLOCKED" appears in the status indicator window. Therefore, when the magnet coils are already energized, the message in the status indicator window changes directly from "PADLOCKED" to "UNLOCKED" when the padlock is removed from its staple.

Figure 3-1. Padlocked Position

6G3.

0009

00

PADLO

CKED

N

B

A

H1 D1 J T1 R S T UT2

F

E

G

K1 H2 K2 C M



Figure 3-2. Intermediate (Locked) Position

Figure 3-3. Unlocked Position

F

E

G

K1 H2 K2 C M

A

N

UNLOCKED

H1 D1 J T1 R S T U

6G3.

0011

.00



3.3.2. Removing the Hand Throw Lever To remove the hand throw lever from the switch lock, the operator must press down on the foot latch. The foot latch may only be pressed down after the armature bar (Q) rotates to lift the lock dog (J) from its position between the stop (R) and the spring collar (H1) as shown in Figure 3-3. This rotation of the armature bar (Q) can be caused by either of the following events:

a. The magnet coils are energized to rotate the armature bar (Q). b. An optional emergency key release is used to rotate the armature bar (Q) via a

spring mechanism which presses directly on the armature bar. The lock dog (J) also lifts the indicator assembly (T1) to force the indicator arm (T) so that the message "UNLOCKED" appears in the status indicator window. The foot latch (A) may then be pressed down to release the hand throw lever (N). When the hand throw lever (N) is removed from the switch lock, the lever lock rod (M) moves into position to hold the foot latch in its open position. This feature prevents the possibility of becoming locked out of the switch lock if the magnet coil current is interrupted. Also, the use of the lock rod ensures that the hand throw lever is fully returned to the switch lock before the cam-operated contacts can be returned to their normal positions 3.3.3. Replacing the Hand Throw Lever When the hand throw lever (N) is returned to the switch lock, the lever lock rod (M) is fully removed from the latch, and the foot latch (A) springs back to its intermediate position due to the force of spring (D1). The message "UNLOCKED" continues to be displayed in the status indicator window until the magnet coils are deenergized. When the coils are deenergized, the armature bar (Q) allows the indicator arm (T) to drop back until it contacts the indicator shield (U). This position of the indicator arm displays the message "LOCKED" in the status indicator window. If an emergency key release (without latch ) has been used to unlock the switch lock, the message "UNLOCKED" continues to be displayed in the status indicator window until the emergency key is removed from the lock. When the key is removed, the spring which bears down on the armature bar (Q) is released, which allows the indicator arm (T) to drop back until its contacts the indicator shield (U). This position of the indicator arm displays the messaged "LOCKED" in the status indicator window. If an emergency key release (with latch) has been used to unlock the switch lock, the latch bar (Y3) is placed between spring collar (H1) and the lock housing (K1) . This prevents the armature contacts and the cam-operated contacts from returning to their normal positions. The message "UNLOCKED" remains in the status indicator window, even if the switch lock is padlocked, and the emergency key release latch must be reset (Refer to Section 3.3.5)



3.3.4. Replacing the Padlock The switch lock may be padlocked from either the "LOCKED" or the "UNLOCKED" statuses. The operator presses down on the upper portion of the foot latch to force the latch towards the switch lock case so that the padlock staple is exposed. The plunger (C) moves from the intermediate position (See Figure 3-2) to the padlocked position (See Figure 3-1). As a result of this movement of the plunger (C), the cam follower (E) drops down along the beveled surface of cam (G). Since the cam follower (E) is connected to the contact operating lever (F), the movement of the cam follower (E) causes a clockwise rotation (viewed from the latch side) of the contact operating lever (F). This clockwise rotation is caused by the action of the spring (D2). The contact operating lever (F) pulls down on the indicator spring (S), forcing the indicator arm (T) so that the message 'PADLOCKED" appears in the status indicator window. In addition to changing the status indication, the contact operating lever (F) lifts the contact operating driver (V) to return the contacts to their normal positions. The contact operating lever (F) also engages the depressor (F1) to press down on the armature bar (Q). Therefore, the armature bar is forced to position the lock dog (J) between the stop (R) and the spring collar (H1). The lock dog prevents the plunger (C) from being withdrawn. If the optional emergency key release with latch has been used, the latch bar (Y3) is placed between spring collar (H1) and the lock housing (K1) . The latch bar (Y3) acts as an obstruction to hold the spring collar (H1) in position beneath the lock dog (J). This prevents the armature contacts and the cam-operated contacts from returning to their normal positions. The message "UNLOCKED" remains in the status indicator window, even if the switch lock is padlocked. The switch lock may be padlocked with the latch bar (Y3) blocking the spring collar (H1). The operator presses down on the upper portion of the foot latch to force the latch towards the switch lock case so that the padlock staple is exposed. The plunger (C) moves from the intermediate position (See Figure 3-2) to the padlocked position (See Figure 3-1). However, since the spring collar (H1) is blocked, there is very little clearance between the spring collars (H1 and H2). 3.3.5. Resetting the Emergency Key Release Latch See Figure 3-4. On switch locks equipped with an optional key release, the turning of the key deflects a spring which presses directly on the armature bar (Q). The pressure exerted by this spring is sufficient to move the lock dog (J), the indicator arm (T), and the armature contacts to their "UNLOCKED" positions. The emergency key release with latch (See Figure 3-4) uses a trigger arm (Y1) which is rotated in a clockwise direction (viewed from the key end of the switch lock) when the key is turned in the key release. The trigger arm (Y1) trips the latch bar (Y2) which is held via a spring in its unlatched position against point X of the latch bar guide bracket (Y3).



When the latch bar (Y2) is tripped, the spring pulls the latch bar towards the spring collar (H1) and holds it there until the trainman steps on the foot latch. The latch bar (Y2) is then moved into position behind the spring collar (H1) to block its return. To reset the latch, the maintainer must open the housing cover of the switch lock. The pressure on the latch bar (Y2) is released by pressing down on the foot latch. The latch bar may then be manually reset by moving the latch bar away from the spring collar (H1) until the head of the latch bar snaps back into point X of the latch guide (Y3). The key release cover must be closed during resetting of the latch.

Figure 3-4. Emergency Key Release Latch

A narrow finger (L) is mounted on the inside of the key release cover and extends through the keyhole plate (L1) and between the two lugs (L2) on the keyhole cover. The trigger arm (Y1) is directly coupled to the key release mechanism and cannot be rotated from the inside of the lock when the cover is removed. This prevents the maintainer

K1 L3 Y3 Y2 Y1

LL2

H1 POINT X

L2

Y2 Y1

Y3

L L1

1/32

6G3.

0012

.00



from pushing the trigger arm below the latch bar while resetting the latch. This would raise the lock dog (J), via the spring (Z1), to the unlocked position to which the lock dog would be urged at all times except when the foot latch is padlocked. If the key release cover is held open while resetting the latch, the trigger arm can rotate below the latch bar. In this condition, the cover would not be closed sufficiently to insert the car seal. The end of the finger would strike the face of the key release lug and be restricted from entering the slot. If this occurs, the maintainer would have to place the trigger arm in its proper position before the cover could be properly closed.



4. MAINTENANCE AND TEST PROCEDURES 4.1. General This section contains procedures for preventive maintenance, corrective field maintenance, and shop maintenance for the SL-25 and SL-26 Switch Locks. 4.2. PREVENTIVE MAINTENANCE Sections 4.2.1 through 4.2.3 outline procedures for periodic cleaning, inspection, and lubrication of the SL-25 and SL-26. These procedures must be performed at least once every six months to ensure continued fault-free operation. 4.2.1. Cleaning Extensive cleaning is not required. However, it is imperative that the switch lock is cleaned at the time of inspection (once every six months). Cleaning prevents excessive wear and corrosion. It also ensures that electrical components are not pitted or possibly shorted because of excessive filtration of sand and/or dust. In addition, cleaning prepares surfaces for lubrication. Clean the switch lock as outlined in Sections 4.2.1.1 and 4.2.1.2. 4.2.1.1. Recommended Cleaning Equipment and Materials (or equivalent)

Device/Material Specifications Degreaser --- Cloths Lint-free

4.2.1.2. Procedure

1. Dampen a lint-free cloth with degreaser. 2. Wipe the switch lock components free of any accumulated dust and dirt. Pay

particular attention to ventilators, electrical contacts, terminals, and moving parts, e.g., cams, contact springs, and trunnions.

CAUTION

Do not use degreaser on the magnet coils as mechanical damage may result.

3. Dry the switch lock components with a clean lint-free cloth. 4.2.2. Inspection In general, inspection consists of observing the appearance and integrity of the switch lock components, the associated electrical conduit, and the connection with the hand throw lever and lever lock rod. A judgment is then made as to whether the switch lock appears to be in good condition, or whether a potential or obvious faulty condition exists. When any faulty condition is observed, it is to be corrected immediately. Inspection should be performed following the cleaning, i.e., once every six months.

1. Check the switch lock internal components for any sign of pitting, corrosion, or general deterioration. Any such defective components must be replaced.



2. Check for loose or damaged electrical connections. 3. Check for burned, frayed, or broken insulation. 4. Check for accumulation of dust, dirt, and foreign material. 5. Check the switch lock cover gasket for resiliency and signs of wear. The gasket

should form a tight seal when the hinged cover is closed, i.e., the hinged cover should not be loose. Replace worn gaskets.

6. Check that the conduit to the switch lock is not crimped, nicked, cut, or otherwise damaged.

7. Operate the foot latch as often as necessary and check for the following: a. Proper movement of the plunger and related mechanisms b. Excessive or unusual friction c. Excessive wear or lost motion d. Positive and firm contact between the movable contact springs and the fixed

contact springs 8. Check that the switch lock cover hinge pins, ventilators, cams, contacts, and

other moving parts do not show excessive wear. 4.2.3. Lubrication After the switch lock has been cleaned and inspected, perform the following lubrication procedures. Lubrication should be performed at the time of installation and also following inspection and cleaning, i.e., every six months. The following steps outline the lubrication procedures. 4.2.3.1. Recommended Lubrication Equipment and Materials (or equivalent)

Device/Material Specifications Grease Gun --- Oil Can --- Grease Specification M-7650-01 Oil SAE-30

4.2.3.2. SL-25 and SL-26 Switch Lock Lubrication Procedure

1. Use a grease gun to apply grease, specification M-7650-01, to the Alemite fittings located on either side of the foot latch.

2. Fill the oil holes for the contact operating lever trunnions with SAE-30 oil. 3. Apply a few drops of SAE-30 oil to the cover hinges, hasp pin, and movable parts

of the foot latch. 4. Apply a light coat of oil to the plunger rod, plunger spring, collars, cam, and cam

follower.



CAUTION

Do not lubricate the armature or indicator trunnions. Lubrication at these points may interfere with mechanical operation of the switch lock.

5. Apply a light coat of grease to the cover gaskets. 4.3. Field Checks and Corrective Field Maintenance Corrective maintenance at the field level is limited to minor adjustments (such as contact springs), and replacement of those components (such as cover gaskets) easily replaced in the field. It is recommended that more difficult component adjustment or replacement be performed in the shop. Procedures for removing the switch lock as an assembly from its environment are considered obvious and are not included. 4.3.1. Magnet Coils and Back Strap See Figure 4-1.

1. Check that the magnet coils (2) are held tightly against the back strap (1) by use of sufficient compression washers (3) to prevent damage due to vibration. The pressure of the back strap, however, should not be so great that it damages or distorts the coils.

2. Check that the back strap fastening screws (4) are tight and properly locked with locking tabs.

4.3.2. Armature See Figure 4-1. Four stop pins (6) are used to determine the armature air gap (5). The two lower stop pins in the armature (located near the ends and farthest from the trunnions) are filed to 0.035 inch. These lower pins determine the actual air gap. The two upper stop pins in the armature (located near the ends and closest to the trunnions) act as safety pins and are slightly shorter than the lower stop pins.

1. Check that the lower stop pins maintain the air gap. If the armature comes close enough to the magnet cores to engage the upper (safety) stop pins, the armature must be repaired so that the lower stop pins maintain a 0.035 inch air gap.

2. Check that the armature air gap is consistently parallel and that the lower stop pins contact the pole face inserts as nearly flat across their surface as possible. If not, the armature brackets should be adjusted to provide a parallel air gap.

4.3.3. Armature Bracket and Bearings 1. Check that the trunnions in the armature bracket are in alignment with each

other. 2. Check for excessive friction or binding in the bearings. 3. Check that the armature and armature bar assembly are centered. The shaft end

play should not be less than 0.010 inch or more than 0.020 inch.



Figure 4-1. Magnet Coil and Armature Assembly

4.3.4. Armature-Operated Contacts In the following procedures, the term "back" contacts refers to those fixed contacts mounted on the outside edge of the contact spring board below the moveable contacts. The back contacts are closed in the normal deenergized position of the switch lock. The term "front" contact refers to the fixed contact mounted on the center top of the contact spring board above the movable contact. The front contact is open in the normal deenergized position of the switch lock.

1. Check that the silver contact tips meet the contacting surfaces squarely. 2. Energize the magnet coils. The two back contacts should break contact with the

movable contacts at the same time. 3. Deenergize the magnet coils. The two back contacts should make contact with

the movable contacts at the same time. Adjustment of the armature-operated contacts can best be accomplished in the shop, with the magnet coils and contact assembly removed from the switch lock housing. Refer to Section 4.4.1 for adjustment procedures. 4.3.5. Pick-Up and Drop-Away Voltages for Armature If the armature contacts have been adjusted to meet the requirements outlined in Section 4.3.4, the operating values, i.e., the pick-up and drop-away voltages, should be checked that they meet the specifications listed in the applicable table, either Table 4-1 or Table 4-2. These values should also be checked if problems occur with the armature sticking or failing to pick up. This procedure requires removing the switch lock from the field and performing the checks in a shop. Refer to Section 4.4.2.



4.3.6. Armature Bar Depressor 1. Place the switch lock is in its padlocked position. 2. Check that the rigid depressor clears the armature bar by 0.001 inch to 0.015

inch. 3. Remove the padlock from the switch lock latch. 4. Energize the magnet coils so that the armature is in its fully closed (energized)

position. 5. Push down on the foot latch so that the latch is in its fully open position. 6. Insert a 1/2 x 1 inch bar into the lever lock rod slot to hold the foot latch open. 7. Check that the rigid depressor clears the armature bar by 0.015 inch minimum. 8. If the clearance is less than 0.015 inch, place a screwdriver or similar tool under

the depressor surface which strikes the armature bar. Carefully pry upward to bend the rigid depressor to the desired clearance. Be careful not to overbend or distort the rigid depressor.

4.3.7. Depressor Spring See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Place the switch lock is in its padlocked position. 2. Check that the depressor spring (P) bears across the full width of the wearing

piece mounted on the armature bar. 3. Check the pressure of the depressor spring. A force of 36 ounces minimum and

46 ounces maximum should be required to lift the end of the depressor spring just clear of the armature bar.

4. Remove the padlock so that the switch lock latch is in its open position. 5. Check that the depressor spring clears the armature bar. This ensures that the

armature bar can rotate full stroke when the magnet coils are energized. 4.3.8. Contact Operating Lever See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Place the switch lock is in its padlocked position. 2. Check that the cam follower (E) is firmly seated on the cam (G). 3. If the cam follower does not seat on the cam, there may be excessive friction

between the cam follower and the cam. Apply a light coat of SAE-30 oil to the cam and cam follower.

4.3.9. Lock Dog Clearance See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Energize the magnet coils so that the armature is in its fully closed (energized) position.



2. Push down on the foot latch so that the latch is in its fully open position. 3. Check that the bottom of the lock dog (J) clears the large diameter of the spring

housing (H1) by 0.036 inch to 0.042 inch. This clearance is necessary to obtain the correct pick-up voltage.

4.3.10. Cam-Operated Contacts (SL-25 Only) See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Check that the contact springs are aligned with each other. 2. Check that the fixed contact springs make contact approximately at the center of

the contact tip of the movable contact spring. 3. Check that the silver contact tips meet the contact surfaces squarely. 4. Place the switch lock is in its padlocked position. 5. Check the contact gap of the normally-open contacts. They should have an

opening of 0.050 inch minimum. 6. Check the contact compression of the normally-closed contacts. They should be

closed and have a 1/32 inch deflection (measured from the stop). With this amount of deflection, the tension measured at the end of the spring should be nine ounces minimum and twelve ounces maximum.

NOTE

This corresponds to adjusting the normally-closed contacts to just make contact when a 3/32 inch spacer is placed between the stop flange of the lock dog (J) and the guide plate (R). The rigid depressor on the contact operating lever should just touch the armature bar.

7. Remove the padlock from the switch lock latch. The plunger coil spring should force the plunger and latch so that the contact operating arm is fully lifted.

8. Check the contact compression of the normally-open contacts. They should be closed and have a 1/32 inch deflection (measured from the stop). With this amount of deflection, the tension measured at the end of the spring should be nine ounces minimum and twelve ounces maximum.

9. Check that all normally-open or all normally-closed contacts make contact and break contact at the same time. When both normally-open and normally-closed contacts are used, the normally-closed contact gap should not be less than 0.020 inch when the normally-open contacts just make contact.

10. When the latch is in the padlocked position, check that movement of the padlock does not affect the contact compression of closed contacts or the gap of open contacts. This inspection should be made by using a padlock with a bail 5/16 inch diameter in the staple.



4.3.11. Cam-Operated Contacts (SL-25 with Emergency Key Release and Latch)

1. If the SL-25 Switch Lock is equipped with an emergency key release (with latch) the contact adjustment should first be made as described in Section 4.3.10.

2. Use the emergency key release to unlock the switch lock. 3. Push down on the foot latch so that the key release latch enters between the lock

housing and the spring collar. 4. Push down on the upper portion of the foot latch. 5. Apply the padlock. 6. Check the gap of the normally-closed contacts. They should have an opening of

0.025 inch minimum. NOTE

To meet the requirement of the 0.025 inch minimum opening for the normally-closed contacts, it may be necessary to readjust the contacts so that the tension measured at the end of the spring is closer to the nine ounce minimum value as measured in Step 6 of Section 4.3.10.

7. Check that normally-open contacts are closed. 4.3.12. Cam-Operated Contacts (SL-26 Only) See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Remove the padlock from the switch lock latch. 2. Check the clearance between the upper side of the movable contact springs and

their respective rungs on the contact driver. This gap should be between 0.002 inch and 0.010 inch.

3. Check the clearance between each side of the movable contact springs and the contact driver. The minimum clearance is 0.010 inch for each side.

4. Check the compression of the normally-open contacts. The fixed contact spring should have a compression of 0.046 inch to 0.056 inch (deflection measured at the silver tip).

5. Place the switch lock is in its padlocked position. 6. Check the contact gap of the normally-open contacts. They must have a gap of

5/64 inch to 7/64 inch. 7. Check that contact pairs make contact and break contact within 1/64" of each

other. 8. Remove the padlock from the switch lock latch. 9. Press down on the foot latch.



10. Place a 1/8 inch obstruction between the spring collar (H1) and the lock housing (K1).

11. Place the switch lock is in its padlocked position. 12. Check the compression of the normally-open contacts. They must make contact

with a minimum compression on the fixed contact spring of 0.025 inch (deflection measured at the silver tip).

4.3.13. Overall Check of Mechanism See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Remove the padlock from the switch lock. 2. Press down on the foot latch. 3. Place a 1/8 inch obstruction between the spring collar (H1) and the lock housing

(K1). 4. Press down on the upper portion of the foot latch. 5. Replace the padlock on the switch lock. 6. Check the cam-operated contacts. The contacts should give the same indication

as though the padlock were removed from the switch lock. The shunt contacts must make contact with a minimum compression on the fixed contact spring of 0.025 inch (deflection measured at the silver tip).

4.3.14. Indicator See Figure 1-2, Figure 1-3, and Figure 1-4.

1. Check that the indicator arm moves freely in its bearings. 2. Check that the indicator spring (S) on the contact operating lever (F) bears

sufficiently on the lug (T2) of the indicator arm (T1) to display the message "PADLOCKED" when the switch lock is in the padlocked position.

3. Check that the counterweight (T3) is adjusted to bias the indicator arm (T1) towards the lock dog (J). For this adjustment, the switch lock should be in the "LOCKED" position. The force required to just move the indicator plate should not be less than 15 grams or more than 18 grams. This force should be applied to the top edge of the indicator plate and exerted in the direction the plate moves.

4. Check that the screw (T4) is adjusted so that when the armature is in its energized position, the lock dog (J) lifts the screw (T1) to move the indicator arm (T4) to display the message "UNLOCKED" in the center of the indicator aperture.

5. Check that the counterweight (T3) and the screw (T4) are locked into position via jam nuts.

6. Check that the indicator reflects the correct status of the switch lock for each of the three status messages.



4.3.15. Lever Lock Rod 1. Check the position of the beveled end of the lever lock rod. It should be

positioned according to the instructions on the escutcheon plate on the inside of the cover. Refer to Section 2.2.

2. Push down on the foot latch. 3. Remove the hand throw lever from the latch. 4. The lever lock rod must enter its slot in the latch without binding.

4.3.16. Key Release See Figure 1-2, Figure 1-3, and Figure 1-4. Switch locks that are equipped with the optional key release should be checked for proper operation using both a new key and a worn key. For this procedure the magnet coils should be deenergized.

1. Turn the key in the lock. There should be no binding, and the release mechanism should turn freely.

2. Turn the key clockwise as far as it will turn (approximately 90°). The armature should move to the same position as when the magnet coils are energized.

3. Remove the key from the lock. The stud on the spring (Z1) should clear the armature by 1/16 inch.

4.3.17. Key Release Latch See Figure 1-5. Adjust the shims (L3) between the latch bar guide bracket (Y3) and the housing so that the trigger arm (Y1) will release the latch bar (Y2) and provide 1/32 inch clearance between the latch bar (Y2) and the shoulder of the lock housing (K1). 4.4. Shop Checks and Maintenance 4.4.1. Armature-Operated Contacts In the following procedures, the term "back" contacts refers to those fixed contacts mounted on the outside edge of the contact spring board below the moveable contacts. The back contacts are closed in the normal deenergized position of the switch lock. The term "front" contact refers to the fixed contact mounted on the center top of the contact spring board above the movable contact. The front contact is open in the normal deenergized position of the switch lock. After removing the magnet and contact spring assembly from the switch lock housing, the assembly must be fastened to a suitable fixture which will hold the lock dog (J) at its proper elevation with respect to the bottom of the magnet frame and also to obtain correct lift of the lock dog. That part of the fixture holding the lock dog must be adjustable so that by raising or lowering it, the lift of the lock dog from the armature open position to that when the armature is fully closed ,should not be less than 0.219 inch or more than 0.234 inch. After the lift of the lock dog has been correctly determined, the contacts can be adjusted.



Any required adjustment to the contacts should be minimal. The contact springs must not be bent excessively or mechanical damage may result. The movable contacts normally should not have to be adjusted. The back contacts should be adjusted first by bending the back contact spring. Normally the back contact stop should not have to be adjusted. The front contact should then be adjusted as required. The required adjustment values for both the front and back contacts are detailed in Sections 4.4.1.1 and 4.4.1.2.

NOTES

When bending a contact spring to increase compression, always bend slightly beyond the desired point then bend back carefully until the proper compression is obtained. Before adjusting the armature contacts, all silver tips should be cleaned.

4.4.1.1. Back Contact Adjustment

1. Energize the magnet coils and check that the armature is in the energized position.

2. Check the contact gap. There should be an opening of 0.050 inch minimum between the back contact and the corresponding movable contact, and the back contact spring should be seated on its respective stop (See Figure 4-2A).

3. Deenergize the magnet coils and check that the armature is in the deenergized position.

4. Check the contact compression. The back contacts should make contact with the corresponding movable contact so that there is 0.015 inch minimum between the back contact spring and its respective stop (See Figure 4-2B).

5. With the back contacts properly adjusted and the magnet coils deenergized, check that the lock dog is seated on its stop.

4.4.1.2. Front Contact Adjustment

1. Deenergize the magnet coils and check that the armature is in the deenergized position. The lock dog should be resting on its stop.

2. Check the contact gap. There should be a clearance of 0.050 inch minimum between the front contact and the movable contact, and the front contact spring should be seated on its stop (See Figure 4-2A).

3. Energize the magnet coils and check that the armature is in the energized position.

4. Check the contact compression. The front contact should make contact with the movable contact so that there is 0.015 inch minimum between the stop and front contact spring and its stop (See Figure 4-2B).



Figure 4-2. Contact Adjustment

4.4.2. Pick-Up and Drop-Away Voltages for Armature If the armature contacts have been adjusted to meet the requirements outlined in Section 4.4.1, the operating values, i.e., the pick-up and drop-away voltages, should be checked that they meet the specifications listed in the applicable table, either Table 4-1 or Table 4-2. Table 4-1 lists values that should be used for magnet assemblies removed from the switch lock housing. Table 4-2 lists values that should be used for magnet assemblies installed in the switch lock. These values should also be checked if problems occur with the armature sticking or failing to pick up. If the actual values fall outside the specified limits, the magnet coils should be replaced. 4.4.2.1. Drop-Away Voltage

1. Apply the charging voltage indicated in Table 4-1 or Table 4-2 to the coil terminals.

2. Gradually reduce the voltage until the armature falls away and the lock dog rests on its stop with the back contacts fully compressed.

3. Note the value at which the armature has fully dropped. This value is the drop-away voltage.

A

B

0.015" MIN.

0.015" MIN.

0.015" MIN.

0.050" MIN.

0.050" MIN.

0.050" MIN.

6G3.

0014

.00



4. Compare the actual drop-away voltage to the value listed in Table 4-1 or Table 4-2. The actual value should not be less than the value specified in Table 4-1 or Table 4-2.

4.4.2.2. Direct Pick-Up and Working Voltages

1. After the drop-away voltage has been measured, open the energizing circuit for one second.

2. Reapply current of the same polarity to the magnet coils. The voltage applied to the magnet coils should be low enough that the armature does not immediately pick up.

3. Gradually increase the voltage until the armature picks up to the fully closed position with the lower stop pins engaging the pole faces.

4. Note the value at which the armature has fully picked up. This value is the pick-up voltage

5. Compare the actual pick-up voltage to the value listed in Table 4-1 or Table 4-2. The actual value should not be greater than the value specified in Table 4-1 or Table 4-2.

Table 4-1. Operating values for Magnet Assembly (External to the Lock Housing)

Ohms Per Pair of Coils

Without Indicator With Indicator Recommended

Minimum Operating Volts

(at 70°F) Charge Volts

Minimum Drop-away

Volts

Maximum Pick-Up

Volts Charge Volts

Minimum Drop-away

Volts

Maximum Pick-Up

Volts

With Armature Contacts

50 7.75 1.08 1.93 10.25 1.24 2.56 3.20 75 9.50 1.33 2.37 12.60 1.52 3.14 3.93

120 12.10 1.69 3.02 16.00 1.94 4.00 5.00 180 15.00 2.10 3.75 19.90 2.40 4.97 6.22 280 18.90 2.64 4.72 25.00 3.02 6.23 7.80 440 24.20 3.38 6.05 32.00 3.87 8.00 10.00 670 30.00 4.21 7.52 40.00 4.82 9.94 12.44

1000 36.40 5.08 9.10 48.00 5.82 12.00 15.00 Without Armature Contacts

50 8.20 0.61 2.05 10.71 0.77 2.68 3.35 75 10.10 0.75 2.52 13.17 0.94 3.29 4.11

120 12.80 0.95 3.21 16.80 1.20 4.19 5.24 180 16.00 1.18 4.00 20.80 1.48 5.22 6.53 280 20.00 1.48 5.00 26.20 1.86 6.53 8.16 440 25.70 1.90 6.43 34.00 2.39 8.38 10.50 670 32.00 2.37 8.00 42.00 2.98 10.42 13.00



1000 38.60 2.87 9.65 50.00 3.61 12.55 15.70



Table 4-2. Operating Values for Magnet Coils in Service

Ohms Per Pair of Coils

Without Indicator With Indicator Recommende

d Minimum Operating

Volts (at 70°F) Charge Volts

Minimum Drop-away

Volts

Maximum Pick-Up

Volts Charge Volts

Minimum Drop-away

Volts

Maximum Pick-Up

Volts

With Armature Contacts

50 7.75 1.08 1.93 10.25 1.24 2.56 320 75 9.50 1.33 2.37 12.60 1.52 3.14 3.93

120 12.10 1.69 3.02 16.00 1.94 4.00 5.00 180 15.00 2.10 3.75 19.90 2.40 4.97 6.22 280 18.90 2.64 4.72 25.00 3.02 6.23 7.80 440 24.20 3.38 6.05 32.00 3.87 8.00 10.00 670 30.00 4.21 7.52 40.00 4.82 9.94 12.44

1000 36.40 5.08 9.10 48.00 5.82 12.00 15.00 Without Armature Contacts

50 8.20 0.61 2.05 10.71 0.77 2.68 3.35 75 10.10 0.75 2.52 13.17 0.94 3.29 4.11

120 12.80 0.95 3.21 16.80 1.20 4.19 5.24 180 16.00 1.18 4.00 20.80 1.48 5.22 6.53 280 20.00 1.48 5.00 26.20 1.86 6.53 8.16 440 25.70 1.90 6.43 34.00 2.39 8.38 10.50 670 32.00 2.37 8.00 42.00 2.98 10.42 13.00

1000 38.60 2.87 9.65 50.00 3.61 12.55 15.70



5. RAIL TEAM AND TECHNICAL SUPPORT

The Rapid Action Information Link (RAIL) team created in 1996 serves the technical needs of current and potential STS USA customers. Convenient 24-hour access and a rapid resolution to customer problems are the trademarks of this organization. The RAIL team, which is staffed primarily by STS USA product and application engineers, is ready to assist and resolve technical issues concerning this or any STS USA product. Direct any questions regarding the contents of this service manual to the RAIL team by telephone at 1-800-652-7276 or through Internet e-mail at [email protected].

mailto:[email protected]


Copyright 2019 SM 5466 Rev 1, March 2019 A-1

APPENDIX-A. PARTS LIST A.1 Switch Lock Variations See Figure A-1 thru Figure A-3.

Table A-1. SL-25 Electric Switch Lock Variations

Item Piece No. (Complete)

Magnet Assembly Key Release Cam-Operated Contact Spring

Board Housing

Part Number Ohms Resistance Switchman Yale

A N249800 N260456 280 N260475 — N262018 N260453 B N263042 N260456 280 — N300354 N262018 N260453 C N263672 N260333 440 — — N262018 N260453 D N267948 N260456 280 N267947 — N262018 N260453 E N268730 N260456 280 — N300354 N268727 N260453 F N269804 N260456 280 — — N262018 N260453 G N272680 N272575 120 N272574 — N262018 N260453 H N273235 N260456 280 — — N262018 N260453 I N274954 N272575 120 N272574 — N262018 N260453 J N276599 N274513 180 — — N262018 N260453 K N277684 N274513 180 — — N262018 N260453 L N278572 N260456 280 N278995 — N262018 N260453 M N280707 N274513 180 N274512 — N262018 N260453 N N283259 N260333 440 — — N262018 N260453 O N283383 N260456 280 N283382 — N262018 N260453 P N295445 N260456 280 — — N268727 N260453 Q N298247 N298246 670 — — N262018 N260453 R N302122 N260456 280 — — N262018 N302121 S N304240 N298246 670 — N300354 N262018 N260453





Board Housing

Part Number Ohms Resistance Switchman Yale

T N308273 N274513 180 N308475 — N262018 N312898 U N309440 N260456 280 — — N268727 N260453 V N309801 N260456 280 — N300354 N268727 N260453 W N317125 N260333 440 — — N262018 N260453 X N317815 N272575 120 N272574 — N262018 N260453 Y N324561 N274513 180 N308475 — N262018 N324567 Z N326691 N260456 280 — — N268727 N260453

Aa N329979 N274513 180 N274512 — N262018 N260453 Bb N337222 N274513 180 N337219 — N262018 N260453 Cc N339480 N260456 280 — N300354 N262018 N260453 Dd N3472222 N260456 280 — — N262018 N260453 Ee N432260 N260456 280 — N432265 N262018 N432262

Ff N432261 N260456 280 N432275 — N262018 N260453

Gg N327774 N260456 280 N327773 — N262018 N260453

Hh N329979-001 N274513 180 N274512-001 — N262018 N260453

Ii N309440-001 N260456 280 — — N268727 N260453

Jj N277684-001 N274513 180 N451532-0201 — N262018 N260453

Kk N277684-002 N274513 180 N451532-0401 — N262018 N260453

LI N432260-001 N260456 280 — N432265 N268727 N260453

Mm N269804-001 N260456 280 — — N262018 N260453



Figure A-1. SL-25 Electric Switch Lock




6G3.

0016

.00

11 553657

30

35

6536 64

90

37 34

10

19

20 21 24 18 13

UNLOCK POSITION

LOCK WITHOUTKEY RELEASE

75

5276 36

74

52

72

YALE KEY TYPERELEASE

73 36

SWITCHMANS KEYTYPE RELEASE

58 36 5271




x x x x x x x x x x x x x x x x x x x x x x x x x x x xx x x x x x x x x x x x x x x x x x x x x x x x x x x x

x x x x x x x x x x x x x x x x x x x xx X x x x x x x x x x x x x x x x

x x x x x x x x x x x x x x x x x x x x x x x x xx x x x x x x x x x x x x x x x x x x x x x x x x

x x x x x x x x x x x x x x x x x

x x x x x x x x x x x x

67

82

8136 7980 50 77 80 78 70 50

JAKE CONNECTOR BOX CONNECTOR

88

83

87

86

36 84 85

LIGHT INDICATORWITH PUSHBUTTON

50

69

68 3689

1-1/4' HOSECONNECTION

LINK

6G3.

0017

.00



A.2 SL-25 Electric Lock Parts List See Figure A-1 thru Figure A-3.


Item No. Description STS USA Part Number

1 Housing (Complete) See Variations Table

2 Cover (Complete) N260451

3 Magnet Assembly (Complete) See Variations Table

4 Cam-Operated Contact Spring Board See Variations Table

5 Contact Operating Lever M260265

6 Depressor Bracket M260335

7 Depressor M260336

8 Depressor Spring M260337

9 Depressor Reinforcing Spring M260338

10 Cam Follower M260339

11 Shim M260340

12 Spring M262020

13 Pin M184180

14 Armature Dog Guide M260347

15 Latch Pin M260348

16 Latch Pin Lock M260349

17 Latch M271491

18 Push Rod M260350

19 Cam M260351

20 Stop Sleeve (Complete) N260353

21 Sleeve (Complete) N260355

22 Trunnion M260356

23 Trunnion Lock Nut M260357

24 Spring M262023

25 Hasp (Complete) N102112

26 Tee Bolt M103344

27 Eye Bolt M260438

28 Ventilator (Complete) N070109

29 Conduit Outlet, 1-1/4" P.T. M268731

30 Screw, 3/8"-16 X 1", Hex. J507349-0116

31 Screw, 1/4"-20 X 7/8", Hex. J500097-0114

32 Screw, 1/4"-20 X 3/4", Hex. J500097-0112

33 Screw, ¼"-20 X 1/2", Hex. J500097-0108




34 Screw, #10-32 X 7/8", Fil. Head J525272-0114

35 Lock Washer, 3/8" J475121-0113

36 Lock Washer, 1/4" J475121-0111

37 Lock Washer, #10 J475121-0109

38 Jam Nut, 1/2"-20, Hex. J048181

39 Cotter, 3/16" X 1-1/8" J048632

40 Lubricating Fitting, 1/8" P.T., 67-1/2° J039142

41 Lubricating Fitting, 1/8" P.T., 30° J039155

42 Shim M260374

43 Screw, #10-32 X 1/2", Fil. Head J525272-0118

44 Screw, #6-40 X 7/16", Fil. Head J052394

45 Lock Washer, #6 J475121-0107

46 Name Plate M437676

47 Rivet J049984

48 Shim M262021

49 Screw, #10-32 X 3/8", Rd. Head J052564

50 Gasket M262025

51 Pipe Thread Protector, 1/2" J032922

52 Gasket M262024

53 Washer M041210

54 Lock Washer, 1/2" J475121-0115

55 Indicator (Complete) N260441

56 Spring M260448

57 Screw, #14-24 X 1-1/8", Fil. Head M451358-2718

58 Screw, 1/4"-20 X 1-1/8", Hex. J050020

59 Spring (Complete) N260469

60 Spring M260466

61 Screw, #10-32 X 7/16", Fil. Head J052360

62 Screw, 3/8"-16 X 3/4", Hex. J050051

63 Washer, 5/16" J047642

64 Filler Plate M331701

65 Screw, 1/4"-20 X 3/4", Fil. Head J052201

66 Pipe Plug, 1-1/4" C.I. Black J032912

67 Tag —

68 Screw, 1/4"-20 X 1", Hex. J050019

69 Hose Connection, 1-1/4" R451435-0103

70 Gasket M266855




With Switchman's Type Key Release

71 Switchman's Type Key Release (Complete) See Variations Table

With Yale Type Key Release

72 Yale Type Key Release (Complete) See Variations Table

73 Screw, 1/4"-20 X 7/8", Hex. J500097-0114

74 Stop Plate M300136

Without Key Release

75 Cover Plate M263673

76 Screw, 1/4%20 X 3/4", Hex. J500097-0112

With Box Connector

77 Box Connector, 1-1/2" —

78 Adapter for Box Connector N271518

79 Gasket N266855

80 Gasket N271516

81 Screw, 1/4"-20 X 7/8", Hex. J500097-0114

With Jake Connector

82 Jake Connector, 1-1/2" —

With Light Indicator (With Pushbutton)

83 Light Indicator with Pushbutton (Complete) N317816

84 Screw, 1 /4"-20 X 2-3/4", Hex. J050029

85 Washer M073099

86 Pipe Plug, 1-1/2" C.I. Black J032913

87 Conduit Outlet, 1-1/2" P.T. M260359

With Light Indicator (Without Pushbutton)

88 Light Indicator Without Pushbutton (Complete) N327973

With Double Padlocking

89 Link M298563

With Single Padlocking

90 Staple M320232

Coil, Magnet Assemblies

91 Coil, Magnet Assemblies

• 60 Ohms N243618

• 90 Ohms N237888

• 140 Ohms N197744

• 220 Ohms N183228

• 335 Ohms N184065

With Heater




Heater N451817-0201

A.3 SL-26 Electric Switch Lock Variations See Figure A-4 thru Figure A-6.




Board Housing

Part Number

Ohms Resistance Switchman Yale

A N260400 N260333 440 — — N260334 M271491

B N273071 N260333 440 — — N273455 M306167

C N284723 N264965 280 — — N260334 M271491

D N274514 N274513 180 N274512 — N260334 M271491




475355

2079

19

1771

5143 60

21

15

42

18

14

4050

16

484951

89 4451

90 91 7713 30

3122

57 23 5082

25

244150

5837

65

4551

38

6637

3950

24 63 64

5145

6

6261

7 9 87652

3

5681

34

59 5 12 1 95 5188

805436

75

87

6874

31

6G3.

0018

.00




6G3.

0020

.00

86

68

84

YALE KEY TYPERELEASE

51 85

SWITCHMANS KEYTYPE RELEASE

73 5168

83

11

52 4672 51

70 41 50

94

10

27

28 32 29 26

67




A.4 SL-26 Electric Switch Lock Parts list See Figure A-4 thru Figure A-6.

Table A-4. SL-26 Electric Switch Lock Parts List


1 Housing (Complete) N260331

2 Cover (Complete) N260451

3 Magnet Assembly (Complete) See Variations Table

4 Shunt Contact Spring Board (Complete) See Variations Table

5 Contact Operating Lever M257102

6 Depressor Bracket M260335

7 Depressor M260336

8 Depressor Spring M260337

9 Depressor Reinforcing Spring M260338

10 Cam Follower M260339

11 Shim M260340

12 Spring M260436

13 Guide M260342

14 Contact Bracket Insulation M260343

15 Plate M260344

16 Bushing M260345

17 Left-Hand Contact Bracket M260433

18 Right-Hand Contact Bracket M257394

19 Inside Contact Bracket M257395

20 Bond Wire Clamp M188796

21 Insulation M260346

6G3.

0021

.00

6992

93 4451 4451

35

33

65

FILLER BLOCK JAKE CONNECTOR COVER PLATEOR

CONDUIT OUTLET




22 Armature Dog Guide M260347

23 Pin M260348

24 Latch Pin Lock M260349

25 Latch See Variations Table

26 Push Rod M260350

27 Cam M260351

28 Stop Sleeve (Complete) N260353

29 Sleeve (Complete) N260355

30 Trunnion M260356

31 Trunnion Lock Nut M260357

32 Spring M260437

33 Cover Plate or Conduit Outlet M263673

34 Hasp (Complete) N102112

35 Tee Bolt M103344

36 Eye Bolt M260438

37 Ventilator (Complete) N070109


39 Screw, 3/8"-16 X 4-1/2", Hex. J050072

40 Screw, 3/8"-16 X 1-3/4", Hex. J050059

41 Screw, 3/8"-16 X 1", Hex. J050053

42 Screw, 3/8"-16 X 3/4", Flat Head J052045

43 Bolt, 1/4%20 X 7/8", Hex. J050017

44 Screw --

● Screw, 1/4"-20 X 7/8", Hex. (With 1-1/2" Box Adapter) J500097-0114

● Screw, 1/4"-20 X 1", Hex. (With Hose Connector) J050019

● Screw, 1/4"-20 X 3/4", Hex. (With Cover Plate) J500097-0112

45 Screw, 1/4"-20 X 1/2", Hex. J050012

46 Screw, #10-32 X 7/8", Fil. Head J052299

47 Bolt, 1/2" M189429

48 Screw, #14-24 X 3/4", Fil. Head J051342

49 Washer, 17/64" X 9/16", Copper J047818

50 Lock Washer, 3/8" J475121-0113

51 Lock Washer, 1/4" J047775

52 Lock Washer, #10 J047733

53 Lock Washer, 1/2" J047751

54 Jam Nut, 1/2"-20, Hex. J048181

55 Nut, 1/2"-13, Hex. J480287




56 Cotter, 3/16" X 1-1/8" J048632

57 Lubricating Fitting, 1/8" P.T., 67-1/2° J039142

58 Lubricating Fitting, 1/8" P.T., 30° J039155

59 Shim M260374

60 Screw, #10-32 X 1/2", Fil. Head J052355

61 Screw, #6-40 X 7/16", Fil. Head J052394

62 Lock Washer, #6 J047662

63 Name Plate M437676

64 Lock Washer, 1/4" J049984

65 Gasket M262025

66 Pipe Thread Protector, 1/2" J032922

67 Pin M184180

68 Gasket M262024

69 Filler Block M273453

70 Indicator (Complete) N260441

71 Spring M260448

72 Screw, #14-24 X 1-1/8", Fil. Head J052328

73 Screw, 1/4"-20 X 1-1/8", Hex. J050020

74 Spring (Complete) N260469

75 Spring M260466

76 Screw, #10-32 X 7/16", Fil. Head J052360

77 Tag --

78 Loop Washer M157273

79 Tag --

80 Lock Washer, 1/2" M041210

81 Lock Washer, 1/2" J047783

82 Screw, 3/8"-16 X 3/4", Hex. J050051

With Switchman's Type Key Release

83 Switchman's Type Key Release (Complete) See Variations Table

With Yale Type Key Release

84 Yale Type Key Release (Complete) See Variations Table

85 Cap Screw, 1/4"-20 X 7/8", Hex. Head S., Tin Pl. J500097-0114

86 Stop Plate M300136




Without Key Release


88 Cap Screw, 1/4"-20 X 3/4", Hex. Head S., Tin Pl. J500097-0112

With Box Connector

89 Box Connector, 1-1/2" —

90 Adapter for Box Connector N271518

91 Gasket M266855

92 Gasket M271516

With Jake Connector

93 Jake Connector, 1-1/2" —

With Single Padlocking

94 Staple M320232

Coil, Magnet Assembly

95 Coil, Magnet Assembly

● 90 Ohms N237888

● 140 Ohms N197744

● 220 Ohms N183228

With Heater

Heater N451817-0201



End of Document

electric switch locks sl-25/sl-26 - hitachi rail...1.2. introduction the sl-25 and sl-26 electric...

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