schematic 420e

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Hydraulic System420E and 430E Backhoe Loader

© 2008 Caterpillar, All Rights Reserved Printed in U.S.A.

RENR6483-01October 2008

Volume 1 of 2: Single Tilt

420E:HLS1-UPKMW1-UP

430E:NCE1-UPDDT1-UP

EAT1-UPMJT1-UP

Volume 2 of 2: Parallel Li ft / Integrated Tool Carrier



Volume 1 of 2 - SINGLE TILTPage 1 of 2

COMPONENT LOCATION

Description

PartNumber Machine

Location

Schematic

Location420E 430E

PUMP GP. 267-2755 1 C-5

HYDRAULIC TANK 246-5286 2 A-4

TANK GROUP 245-8777 3 A-4

COOLER HYDRAULIC COOLER 4 B-3

FILTER 226-9747 5 B-3

HMU 210-6240 6 A-8

STEER CYLINDER - FRONT N/A 7 A-8

LIFT CYLINDER - ST 228-3509 8 D-12

TILT CYLINDER - ST 200-7128 9 C-12

TILT CYLINDER - MP BUCKET (OPT) N/A 10 B-12

STABILIZER CYLINDER - LH 262-7049 11 I-4

STABILIZER CYLINDER - RH 262-7050 11 I-10

CYLINDER GP - BOOM 268-9049(S) 268-9051(S)210-7076 246-9884

12 I-9

CYLINDER GP - STICK 210-7081(S) 210-7091 13 I-8

CYLINDER GP - SWING 278-1971 14 I-7

CYLINDER GP - BUCKET 210-7087(S) 210-7095(S) 15 I-6CYLINDER GP - E-STICK (OPT). 210-7097(S) 16 I-6

VALVE PILOT 2-BANK

VALVE PILOT-BODY 223-4713 17 E-8

LEVER W/DTNT & SWTCH (OPT) 223-4715 17 E-8

ACCUMULATOR 226-0420 18 H-11

RIDE CNTRL VALVE (OPT) 245-8780 19 E-12

RIDE CNTRL ACCMLTR (OPT) 162-3960 20 E-12

RIDE CNTR PRES. SWTCH(OPT) 131-9203 21 D-12

TEMP. SENSOR (OPT) TEMP SENSOR22 C-4

DIFF. PRES. SWITCH (OPT) 134-0404 23 B-3

LOADER VALVE (ST)

2 BANK 266-2552 27 B-10

3 BANK 266-2553 27 B-10

INLET SECTION 269-1080 27 E-10

LIFT SECTION 269-1091 27 D-10

TILT SECTION 269-1092 27 C-10

AUX SECTION 269-1093 27 B-10

OUTLET MANIFOLD 269-1079 27 B-10



Volume 1 of 2 - SINGLE TILTPage 2 of 2

COMPONENT LOCATION

BACKHOE VALVE (CP)

6 BANK 266-2556 30 H-10

7 BANK 266-2557 30 H-10

8 BANK 266-2558 30 H-10

BOOM SECTION 269-1062 30 G-9

STICK SECTION 269-1063 30 H-8

E-STICK SECTION 269-1066 30 G-6

OUTLET MANIFOLD 269-1059 30 G-3BACKHOE VALVES (COMMON)

INLET MANIFOLD 269-1060 32 G-10

STABILIZER SECTION 269-1061 32 G-10, G-4

SWING SECTION 269-1064 32 G-7

BUCKET SECTION 269-1065 32 G-6

AUX SECTION 269-1067 32 G-5

PATTERN SWITCHING VALVE 257-7724 32 G-7

VALVE GP -CUSHION RELIEF 206-3685 (STD) 33 I-7

VALVE GP -PILOT (BACKHOE) 267-2758 34 E-5

MANIFOLD -PILOT 268-0094 36 D-9



Volume 2 of 2 - PARALLEL LIFT / INTEGRATEDTOOL CARRIER, Page 1 of 2

COMPONENT LOCATION

DescriptionPart

Number MachineLocation

SchematicLocation

420E 430EPUMP GP. 267-2755 1 C-5

HYDRAULIC TANK 246-5286 2 A-4

TANK GROUP 245-8777 3 A-4

COOLER HYDRAULIC COOLER 4 B-3

FILTER 226-9747 5 B-3

HMU 210-6240 6 A-8

STEER CYLINDER - FRONT N/A 7 A-8

LIFT CYLINDER - PL/IT 228-3505 8 D-12

TILT CYLINDER - PL/IT 192-3884 9 C-12

TILT CYLINDER - MP BUCKET (OPT) N/A 10 B-12

STABILIZER CYLINDER - LH 262-7049 11 I-4

STABILIZER CYLINDER - RH 262-7050 11 I-10

CYLINDER GP - BOOM268-9049(S) 268-9051(S)

210-7076 246-9884 12 I-9

CYLINDER GP - STICK 210-7081(S) 210-7091 13 I-8

CYLINDER GP - SWING 278-1971 14 I-7

CYLINDER GP - BUCKET 210-7087(S) 210-7095(S) 15 I-6

CYLINDER GP - E-STICK (OPT). 210-7097(S) 16 I-6

VALVE PILOT 2-BANK

VALVE PILOT-BODY 223-4713 17 E-8

LEVER W/SWITCHES 223-4714 17 E-8

LEVER W/DTNT & SWTCH (OPT) 223-4715 17 E-8

ACCUMULATOR 226-0420 18 H-11

RIDE CNTRL VALVE (OPT) 245-8780 19 E-12

RIDE CNTRL ACCMLTR (OPT) 162-3960 20 E-12

RIDE CNTR PRES. SWTCH(OPT) 131-9203 21 E-12

TEMP. SENSOR (OPT) TEMP SENSOR 22 C-4

DIFF. PRES. SWITCH (OPT) 134-0404 23 B-3

COUPLER VALVE 231-2615 25 B-12

COUPLER CYLINDER 190-3085 26 B-12

LOADER VALVE (ST)

INLET SECTION 269-1080 27 E-10

OUTLET MANIFOLD 269-1079 27 B-10

LOADER VALVE (PL/IT)

2 BANK N/A 28 B-10

3 BANK 266-2563 28 B-10

LIFT SECTION 269-1081 28 B-10, D-10

TILT SECTION 269-1082 28 C-10



Volume 2 of 2 - PARALLEL LIFT / INTEGRATEDTOOL CARRIER, Page 2 of 2

COMPONENT LOCATION

BACKHOE VALVE (CP)

6 BANK 266-2556 30 H-107 BANK 266-2557 30 H-10

8 BANK 266-2558 30 H-10

BOOM SECTION 269-1062 30 G-9

STICK SECTION 269-1063 30 H-8

E-STICK SECTION 269-1066 30 G-6

OUTLET MANIFOLD 269-1059 30 G-3

BACKHOE VALVES (COMMON)

INLET MANIFOLD 269-1060 32 G-10

STABILIZER SECTION 269-1061 32 G-10, G-4

SWING SECTION 269-1064 32 G-7

BUCKET SECTION 269-1065 32 G-6

AUX SECTION 269-1067 32 G-5

PATTERN SWITCHING VALVE 257-7724 32 G-7

VALVE GP -CUSHION RELIEF 206-3685 (STD) 33 I-7

VALVE GP -PILOT (BACKHOE) 267-2758 34 E-5

VALVE GP -PILOT (LOADER) 267-2760 35 C-7

MANIFOLD -PILOT 268-0094 36 D-9



Volume 1 of 2 - SINGLE TILT

TAP LOCATION

Tap

Number

Description Schematic

LocationT1 PUMP DISCHARGE B-7

T2 LOAD SENSE D-5

T3 PILOT PRESSURE D-9

SOS OIL SAMPLING C-4



Volume 2 of 2 - PARALLEL LIFT / INTEGRATED

TOOL CARRIER

TAP LOCATION

Tap

Number

Description Schematic

LocationT1 PUMP DISCHARGE B-7

T2 LOAD SENSE D-5

T3 PILOT PRESSURE D-9

SOS OIL SAMPLING C-4



FLUID POWER SYMBOLS

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTRO L VALVES RESTRICTION LINE RESTRICTION(FIXED)

2-SECTION PUMP

MAIN AUX.

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

LINE RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHA FTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOID andPILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOEITHER DIR

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED



ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit NumberIdentification

Wire Number Identifi cation Codes

Current Standard

Previous Standard

Electrical Schematic Example Hydraulic Schematic Example

325-PK

Wire Color Circuit NumberIdentification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer (Fluid)

Transducer (Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch(Adjustable)

Temperature Switch

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

T



LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pre

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - bYY

HYDRAULICCIRCUIT COLORDESCRIPTIONS

PILOT OIL OUTPUTIMPLEMENT ANDSTEERING PUMPCILIFT CYLINDERCIRCUITBUCKET CYLINDERCIRCUITLOADSENSECIRCUITSTEERING CYLINDERCIRCUITSTICKCYLINDERCIRCUITSUPPLYLINEBOOM CYLINCERCIRCUITTILT CYLINDERCIRCUITLOADERVALVEAUXILIARYCIRCUITDRAIN/ RETURNLINESTABILIZERCYLINDERCIRCUITSWING CYLINDERCIRCUITE-STICKCYLINDERCIRCUITBACKHOEVALVEAUXILIARYCIRCUIBOOSTEDBRAKEOIL PRESSURE

THIS SCHEMATICIS FORTHE 420E AND430E BACKHOE LOADERVOL 1OF 2: SINGLE TILT

MEDIANUMBER: KENR6483-01PARTNUMBER: 268-0120, CHANGE: 01, VERSION: -

Components are shown installed on a fully operable machine.

Refer to the appropriate Service Manualfor Troubleshooti ng, Specifications.

A

B

C

D

E

F

G

H

I

12 11 10 9 8 7 6 5 4 3 2 1

12 11 10 9 8 7 6 5 4 3 2 1

STAB RH BOOM STICK SWING BUCKET E-STICK AUX STAB LH

HMU

PUMP

TANK

BACKHOE VALVE

(7) FRONT STEERCYLINDER

(27) LOADER VALVE (ST) (27) OUTLETMANIFOLD

(6) HMU210-6240

2 BANK(266-2552)3 BANK(266-2553) 269-1079

(27) AUXSECTION269-1093

(27) TILTSECTION269-1092

(27) LIFTSECTION269-1091

(27) INLETSECTION269-1080

(2) HYDRAULIC TANK246-5286

(3) TANK GROUP

(4) HYDRAULICCOOLER

245-8777

(23) DIFF. PRESSSWITCH (OPT)

134-0404

(22) TEMP SENSOR(OPT)

(5) FILTER226-9747

(1) PUMP GP267-2755

(34) VALVE GPPILOT (BACKHOE)

267-2758

AUX

TILT

LIFT

LOADER VALVE

LEFT JOYSTICK RIGHT JOYSTICKSTABILIZER JOYSTICK

BOOSTED BRAKES

BS BT

LEFTBRAKEPEDAL

RIGHTBRAKEPEDAL

TO RELEFTBRAK

TO RERIGHBRAK

DEL

T3

T2

T1SOS

(20) ACCUMULATORRIDE CONTROL (OPT)162-3960

(19) RIDECONTROLVALVE(OPT)245-8780

(21) RIDE CNTR PRESSSWITCH131-9203

(8) LIFT CYLINDER ST228-3509

(9) TILT CYLINDER ST200-7128

(10) MP BUCKET CYL.(OPT)

(36) MANIFOLD-PILOT268-0094

(17) VALVE PILOTBODY

223-4713

(17) LEVER W/DTNT &SWTCH (OPT)223-4715

(18) ACCUMULATOR226-0420

(32) INLET MANIFOLD269-1060

(32) STABILIZERSECTION269-1061

(30) BOOMSECTION269-1062

(30) BACKHOE VALVE (CP)6 BANK (N/A)

7 BANK (266-2563)8 BANK (266-2558)

(11) STABILIZERCYLINDER LH

262-7049

(11) STABILIZERCYLINDER RH

262-7050

(12) BOOMCYLINDER

268-9049(S)210-7076

(13) STICKCYLINDER

210-7081(S)

(14) SWINGCYLINDER278-1971

(15) BUCKETCYLINDER

210-7087(S)

(16) E-STICKCYLINDER(OPT)210-7097(S)(33) VALVE GP

CUSHION RELIEF206-3685(STD)

(30) STICKSECTION269-1063

(30) OUTLETMANIFOLD269-1059

(30) E-STICKSECTION269-1066

(32) BUCKETSECTION269-1065

(32) PATTERNSW VALVE257-7724

(32) SWING

SECTION269-1064





LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pre

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - bYY

HYDRAULICCIRCUIT COLORDESCRIPTIONS

PILOT OIL OUTPUTIMPLEMENT ANDSTEERING PUMPCIRLIFT CYLINDERCIRCUITBUCKET CYLINDERCIRCUITLOADSENSECIRCUITSTEERING CYLINDERCIRCUITSTICKCYLINDERCIRCUITSUPPLYLINEBOOM CYLINCERCIRCUITTILT CYLINDERCIRCUITLOADERVALVEAUXILIARYCIRCUITDRAIN/ RETURNLINESTABILIZERCYLINDERCIRCUITSWING CYLINDERCIRCUITE-STICKCYLINDERCIRCUITBACKHOEVALVEAUXILIARYCIRCUBOOSTEDBRAKEOIL PRESSURE

THIS SCHEMATICIS FORTHE 420E AND430E BACKHOE LOADERVOL 2OF 2: PARALLEL LIFT / INTEGRATED TOOL CARRIER

MEDIANUMBER: KENR6483-01PARTNUMBER: 268-0120, CHANGE: 01, VERSION: -

Components are shown installed on a fully operable machine.

Refer to the appropriate Service Manualfor Troubleshooting, Specifi cations.

12 11 10 9 8 7 6 5 4 3 2 1

12 11 10 9 8 7 6 5 4 3 2 1

STAB RH BOOM STICK SWING BUCKET E-STICK AUX. STAB LH

HMU

PUMP

TANK

BACKHOE VALVE

AUX

TILT

LIFT

LOADER VALVE

LEFT JOYSTICK RIGHT JOYSTICKSTABILIZER JOYSTICK

BOOSTED BRAKES (REF)

BS BT

LEFTBRAKEPEDAL

RIGHTBRAKEPEDAL

TO REARAXLELEFTWHEELBR

TO REARAXLERIGHTWHEELB

DEL

LOADER JOYSTICK

FLOAT RTD

T3

T2

T1SOS(10) MP BUCKET

CYL.(OPT)

(26) COUPLER CYLINDER190-3085

(8) LIFT CYLINDER PL/IT228-3505

(9) TIFT CYLINDER PL/IT228-3505

(25) COUPLERVALVE

231-2615

(7) FRONT STEERCYLINDER

(6) HMU210-6240

(18) ACCUMULATOR226-0420

(30) BACKHOE VALVE (CP)6 BANK (N/A)

7 BANK (266-2563)8 BANK (266-2558)

(11) STABILIZERCYLINDER RH

262-7050

(12) BOOMCYLINDER

268-9051(S)246-9884

(13) STICKCYLINDER210-7081(S)

(30) STICKSECTION269-1063

(14) SWINGCYLINDER278-1971

(33) VALVE GPCUSHION RELIEF

206-3685(STD)

(15) BUCKETCYLINDER

210-7087(S)

(16) E-STICKCYLINDER(OPT)210-7097(S)

(11) STABILIZERCYLINDER LH

262-7049

(20) ACCUMULATORRIDE CONTROL (OPT)162-3960

(19) RIDECONTROLVALVE(OPT)245-8780

(21) RIDE CNTRPRESS SWITCH

131-9203

(2) HYDRAULIC TANK246-5286

(3) TANK GROUP245-8777

(4) HYDRAULICCOOLER

(23) DIFF. PRESSSWITCH (OPT)

134-0404

(22) TEMP SENSOR(OPT)

(5) FILTER226-9747

(1) PUMP GP267-2755

(34) VALVE GPPILOT (BACKHOE)

267-2758

(36) MANIFOLDPILOT268-0094




(30) E-STICKSECTION269-1066

(32) BUCKETSECTION269-1065

(32) INLET MANIFOLD269-1060


(30) BOOMSECTION269-1062

(32) PATTERNSW VALVE257-7724

(32) SWINGSECTION269-1064

(35) VALVE GP - PILOT(LOADER)267-2760

(28) LOADER VALVE (PL/IT)2 BANK(N/A)

3 BANK(266-2563)


(27) INLETSECTION269-1080

(28) TILTSECTION269-1082



(17) VALVE PILOTBODY

223-4713

(17) LEVERW/SWITCHES

223-4713

(17) LEVER W/DTNT& SWTCH (OPT)223-4715



BACKHOE VALVE - SINGLE TILT

A B C D E F G H

I

J

K

The pilot manifold can also beaccessed with the floor plate

removed. The pilot pressure tap(T3) is located on the pilotmanifold. The pilot manifold routespilot oil to and from the loader andbackhoe pilot control valves.

Pilot Manifold

View of pilot controlled backhoe valve with floor plate removed.

L

T3



BACKHOE VALVE - PARALLEL LIFT / INTEGRATED TOOLCARRIER

A B C D E F G H

I

J

K

The pilot manifold can also beaccessed with the floor plate

removed. The pilot pressure tap(T3) is located on the pilotmanifold. The pilot manifold routespilot oil to and from the loader andbackhoe pilot control valves.

Pilot Manifold

View of pilot controlled backhoe valve with floor plate removed.

L

T3



BOOSTED BRAKES

The 420E/430E machines are equipped with hydraulically assisted master cylinders, which decreasesthe amount of pedal effort when braking. This illustration shows the boosted brakes valve group, whichuses oil from the pilot accumulator to add boost to the master cylinder. The hydraulic force multiplies thepedal effort so the operator can get more braking force with less effort.

The brake boost valves are connected to the master cylinder (A) at each brake pedal (B). Oil entersthe master cylinder through the supply hose (C) and exits the master cylinder through the return hose(D). The oil flows to the service brakes through the hoses (E) at the bottom of the master cylinder.

The master cylinders can be removed from the machine from inside the operator's compartment.

This illustration shows a sectional view of the boosted brake valve group. When the brake pedal isdepressed, the boost brake valve moves to the left and inlet oil from the pilot manifold is directedto the master cylinder.

To WheelBrake

Boost BrakeValve

From Pilot Accumulator To Tank

MasterCylinder

SlaveCylinder

A BE D C



IMPLEMENT / STEERING PUMP - SINGLE TILT

The implement and steering pump on the420E and 430E machines is similar to the "D"Series machines, but now includes a torquecontrol solenoid (not visible). The torquecontrol solenoid provides an additional pumpsetting.

The implement and steering pump is locatedbelow the floor plate in the cab. The pumpcontrol valve (H) contains a torque controlspool adjustment screw (B) and a flow com-pensator adjustment screw (A). The adjust-ment screws and the load sensing pressuretap (T2) are accessible from the cab. G

D

E

C

Implement andSteering Pump

AB

C

Loader Valve

H

A

B

F

Drain

T2

T2

T2

T1

T1

VIEW ALL CALLOUTS



IMPLEMENT / STEERING PUMP - PARALLEL

LIFT / INTEGRATED TOOL CARRIER

The implement and steering pump on the420E and 430E machines is similar to the "D"Series machines, but now includes a torquecontrol solenoid (not visible). The torquecontrol solenoid provides an additional pumpsetting.

The implement and steering pump is locatedbelow the floor plate in the cab. The pumpcontrol valve (H) contains a torque controlspool adjustment screw (B) and a flow com-pensator adjustment screw (A). The adjust-ment screws and the load sensing pressuretap (T2) are accessible from the cab. G

D

E

C


AB

C

Loader Valve

H

A

B

F

Drain

T2

T2

T2

T1

T1

VIEW ALL CALLOUTS



LOADER VALVE - SINGLE TILT


The 420E/430E machines can be equipped with amechanically controlled loader valve or a pilot

controlled loader valve as shown in this illustration.

The loader valve is accessed from below the floorplate. The loader control valve group contains:

E

D

C

B

A

F

NOTE: 420E/430E machines with a mechanicallycontrolled loader valve or a pilot controlled loadervalve use the same inlet manifold.

View of mechanically controlled loader valve with floor plate removed.

Loader Valve

B C D

THREE BANK VALVE (PILOT OPERATED)

G

H J K L

M

P

R

N

E

For other bank valve configur ationssee RENR6487 (Specific ations Manual).

Outlet manifold ( A ) Solenoid for the A circuit ( H ) Auxiliary control valve ( B ) Makeup and relief valve ( J )Tilt control valve ( C ) B pilot line port ( K )Lift control valve ( D ) A pilot line port ( L )Inlet manifold ( E ) Priority Valve ( M )Load sensing relief valve ( F ) Dead engine lower valve ( N )Solenoid for the B circuit ( G ) A ports ( P )

B ports ( R )

Hydraulic Oil Filter

sos



LOADER VALVE - PARALLEL LIFT / INTEGRATEDTOOL CARRIER


The 420E/430E machines can be equipped with amechanically controlled loader valve or a pilot

controlled loader valve as shown in this illustration.

The loader valve is accessed from below the floorplate. The loader control valve group contains:

E

D

C

B

A

F

NOTE: 420E/430E machines with a mechanicallycontrolled loader valve or a pilot controlled loadervalve use the same inlet manifold.

View of mechanically controlled loader valve with floor plate removed.

Loader Valve

B C D

THREE BANK VALVE (PILOT OPERATED)

G

H J K L

M

P

R

N

E

For other bank valve configur ationssee RENR6487 (Specific ations Manual).

Outlet manifold ( A ) Solenoid for the A circuit ( H ) Auxiliary control valve ( B ) Makeup and relief valve ( J )Tilt control valve ( C ) B pilot line port ( K )Lift control valve ( D ) A pilot line port ( L )Inlet manifold ( E ) Priority Valve ( M )Load sensing relief valve ( F ) Dead engine lower valve ( N )Solenoid for the B circuit ( G ) A ports ( P )

B ports ( R )

Hydraulic Oil Filter

sos



RIDE CONTROL

Travel at high speeds over rough terrain causes bucket movement. Theoptional Ride Control System acts as a shock absorber by absorbingbucket forces, which stabilize the machine.

The Ride Control System components include; ride control relay (A), ridecontrol solenoids (B), ride control accumulator (C), and ride control pres-sure switch (D).

Two solenoids are now used on the "E" Series machines Ride ControlSystem.

The Ride Control System, on machines with the optional autoshift trans-mission, is controlled by the Machine ECM. The Machine ECM monitorsthe position of the ride control switch and determines when to operate theride control system.

B

A

C

D

ECM



SIDESHIFT SLIDE LOCKS

Sideshift machines feature a boom (A) that can be shifted to different positions along a frame (B).Lock pistons (D) are used to lock the boom to the frame rails. Lock piston solenoids, located on thebackhoe valve outlet manifold, actuate the lock pistons.

The stabilizers (C) are used to raise and lower the machine. Sideshift and center pivot machinesuse the same type of control valves to operate the stabilizers

A

B

D

C

schematic 420e

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