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SKF TMDS 9Mounting Star

Instructions for use

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Table of contents Page

Safety recommendations . . . . . . . . . . . . . . . . . . . . . 4

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. Components . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Bearings and Accessories . . . . . . . . . . . . . . . . . . . 7

5. (Dis)Mounting procedures for shaft no. 1 . . . . . . . . . . . 7

5.1 Mounting bearing 6208 on shaft 1 . . . . . . . . . . . . . . 75.2 Dismounting of bearing 6208 on shaft 1 (1) . . . . . . . . . 85.3 Dismounting of bearing 6208 on shaft 1 (2) . . . . . . . . . 8

6. (Dis)Mounting procedures for shaft no.2 . . . . . . . . . . . 9

6.1 Mounting bearing 7308 BECBP on shaft 2 . . . . . . . . . . 96.2 Dismounting bearing 7308 BECBP on shaft 2 . . . . . . . . 96.3 Mounting ball bearing 6308 on shaft 2 . . . . . . . . . . . 106.4 Dismounting ball bearing 6308 on shaft 2 . . . . . . . . . . 10


7.1 Mounting bearing 21312 E/C3 on shaft 3 . . . . . . . . . . 117.2 Dismounting bearing 21312 E/C3 on shaft 3 . . . . . . . . . 11


8.1 Mounting bearing 21312 EK/C3 on shaft 4 . . . . . . . . . 128.2 Dismounting bearing 21312 EK/C3 on shaft 4 . . . . . . . . 13


9.1 Mounting bearing 21312 EK/C3 on shaft 5 . . . . . . . . . 149.2 Dismounting bearing 21312 EK/C3 on shaft 5 . . . . . . . . 14

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10.1 Mounting bearing 21312 EK/C3 on shaft 6 . . . . . . . . 1510.2 Dismounting bearing 21312 EK/C3 on shaft 6 . . . . . . . 15

11. (Dis)Mounting procedures for shaft no. 7 . . . . . . . . . . 16

11.1 Mounting self-aligning ball bearing1209 EKTN9/C3 on shaft 7 . . . . . . . . . . . . . . . . . 16

11.2 Dismounting self-aligning ball bearing1209 EKTN9/C3 on shaft 7 . . . . . . . . . . . . . . . . . 16

12. (Dis)Mounting procedures for shaft no. 8 . . . . . . . . . . 17

12.1 Mounting ball bearing 6214 on shaft 8 . . . . . . . . . . 1712.2 Dismounting ball bearing 6214 on shaft 8 . . . . . . . . . 1812.3 Mounting ball bearing 6212 on shaft 8 . . . . . . . . . . 1812.4 Dismounting ball bearing 6212 on shaft 8 . . . . . . . . . 18


13.1 Mounting bearing NU 2212 ECP on shaft 9 . . . . . . . . 1913.2 Dismounting bearing NU 2212 ECP on shaft 9 . . . . . . . 19

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Safety recommendations

Never dismount a bearing from a tapered seating by means of theOil Injection Method without having an hydraulic nut or an SKFlocking nut screwed onto the shaft end.

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1. Description

For a bearing to function properly and to last, it is important that thecorrect mounting method and the suitable tools are being used. Careshould also be exercised with regard to cleanliness. Mounting should,

whenever possible, be carried out in a clean and dust-free room and notin the immediate vicinity of dust producing machines. If the bearing is tobe re-used, dismounting must be conducted with the appropriate care.

SKF has developed methods that simplify mounting and dismounting ofbearings and also eliminate almost completely the risks of damagingthese precise machine elements.

This demonstration unit can be used for presentation of variousmethods including the SKF Oil Injection Method. The use of the SKF Oil

Injection Method saves considerable effort and avoids unnecessarydamages to the parts.

The demonstration unit is used to show the following:

Shaft No. 1 - Mounting and dismounting ball bearing 6208, which isfitted on both shaft and housing.

- Mounting and dismounting ball bearing 6208, which isfitted in housing only.

Shaft No. 2 - Mounting and dismounting angular contact ball bearing7308 BECBP on shaft.- Mounting and dismounting ball bearing 6308 on shaft.

Shaft No. 3 - Mounting and dismounting spherical roller bearing21312 E/C3 with cylindrical bore on shaft.

Shaft No. 4 - Mounting and dismounting spherical roller bearing21312 EK/C3 with tapered bore on shaft.

Shaft No. 5 - Mounting and dismounting spherical roller bearing

21312 EK/C3 with adapter sleeve on shaft.

Shaft No. 6 - Mounting and dismounting spherical roller bearing21312 EK/C3 with withdrawal sleeve on shaft.

Shaft No. 7 - Mounting and dismounting self-aligning ball bearing1209 EKTN9/C3 on a shaft in housing SNL 509 TG.

Shaft No. 8 - Mounting and dismounting ball bearing 6214 on shaft.- Mounting and dismounting ball bearing 6212 0n shaft.

Shaft No. 9 - Mounting and dismounting cylindrical roller bearingNU 2212 ECP with cylindrical bore on cylindrical shaft.

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2. Components

Component Designation Qty1) Shaft no. 1 TMDS 9-11 12) Shaft no. 2 TMDS 9-12 13) Shaft no. 3 TMDS 9-13 14) Shaft no. 4 TMDS 9-14 15) Shaft no. 5 TMDS 9-15 16) Shaft no. 6 TMDS 9-16 17) Shaft no. 7 TMDS 9-17 18) Shaft no. 8 TMDS 9-18 19) Shaft no. 9 TMDS 9-19 110) Intermediate ring 1 (Shaft 2) TMDS 9-20 111) Intermediate ring 2 (Shaft 2) TMDS 9-21 112) Disc (Shaft 2) TMDS 9-22 1

13) Distance ring 1 (Shaft 5) TMDS 9-23 114) Distance ring 2 (Shaft 6) TMDS 9-24 115) Support ring (Shaft 5 + 6) TMDS 9-25 116) Stool (Shaft 7) TMDS 9-26 117) SNL 509 TG (Shaft 7) TMDS 9-27 118) Dismounting adapter (Shaft 7) TMDS 6-28 119) Turning Table 2072609 TMDS 9-29 1

3.ToolsDescription Designation Qty

20) Hydraulic Handpump 729124 SRB 121) Hydraulic Nut HMV 12E 122) Electronic Induction Heater TMBH 1 123) Electronic Thermometer TMDT 2 124) Mechanical Fitting Tool TMFT 33 125) Bearing Puller Set TMMD 61 126) Bearing Puller TMMA 3 127) Locknut Spanner TMHN 7 128) Aluminium Heating Ring TMBR NU2212EC 129) Feeler Gauge 729865 A 130) Hook Spanner HN 13 131) Quick Connections Nipple 729100 332) Mounting Fluid LHMF 300/5 133) Dismounting Fluid LHDF 900/5 134) Split Collet Puller Set TMSC 30-60 135) Dial Indicator TMCD 5P 136) Lock Nut Socket TMFS 10 137) Hook Spanner HN 12 138) Hook Spanner HN 8 1

39) High Pressure Pipe 721740 A/300 140) Nipple 227963 141) Strong Back Puller TMBS 50 1

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4. Bearings and Accessories

Bearing Qty Accessory Qty

21312 EK/C3 3 H 312 121312 E/C3 1 AHX 312 16208 1 KM 12 26212 1 MB 12 26214 1 KM 10 11209 EKTN9/C3 1 MB 10 16308 1 H 209 17308 BECBP 2 ASNH 509 1NU 2212 ECP 1 MB 8 1

KM 8 1KM 13 1

Note: Demonstration Unit TMDS 9 includes Turning Table, Shaftsand Accessories (1 to 19).Demonstration Unit TMDS 9/1 includes Turning Table, Shafts,Accessories and Tools (1 to 41).

5. (Dis)Mounting procedures for shaft no.1

5.1 Mounting bearing 6208 on shaft no. 1

Make sure that the bearing bore, as well as the shaft and housingseating are clean. Apply a thin layer of oil. Select the correctcombination of sleeve and impact ring from Fitting Tool TMFT 33,according to the selection chart. Place the bearing to its seating anddrive up using Fitting Tool TMFT 33.

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5.2 Dismounting of bearing 6208 on shaft no. 1 (1)

Select the correct combination of puller arms and withdrawal screw fromball bearing puller TMMD 61, according to the instruction for the tool.Insert the arms between the bearing rings, place the withdrawal screw

in position and dismount the bearing.

5.3 Dismounting of bearing 6208 on shaft no. 1 (2)

Mount bearing 6208 as in procedure 5.1 but without the center part ofshaft no. 1. Select extractor TMSC 30-60 and insert this through bore ofbearing. Tighten the collet nut to expand the extractor behind bearing.Connect the slide hammer, extract by throwing the hammer towards thehandle.

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6. (Dis)Mounting procedures for shaft no. 2

6.1 Mounting bearings 7308 BECBP on shaft no. 2

Mounting bearings with cylindrical bore can best be done byheating them. Bearings should be heated about 80 to 90C abovethe temperature of the shaft, but should never exceed 125C. Tohandle the hot bearings, use clean gloves (TMBA G11) or cleanlint-free cloth.Heat both angular contact ball bearings on the Induction HeaterTMBH 1. When both bearings has reached the desired temperature,push them, one by one, in back-to-back arrangement onto the shaftwithout misalignment. Press the bearing inner rings against theabutment face of the disc until an interference fit is obtained.

6.2 Dismounting bearings 7308 BECBP on shaft no. 2

Place bearing puller TMMA 3 around the disc behind both angularcontact ball bearings 7308 BECBP and release the spring of the puller.Dismount both bearings by means of the puller.

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6.3 Mounting ball bearing 6308 on shaft no. 2

Heat ball bearing 6308 with Induction Heater TMBH 1, as described inpoint 6.1. When the bearing has reached the desired temperature, pushit onto the shaft without misalignment. Press the bearing inner ringagainst the abutment face of the longerintermediate ring until an interference fit is obtained.

6.4 Dismounting ball bearing 6308 on shaft no. 2

Place bearing puller TMBS 50 behind ball bearing 6308 accordingto the instruction of the tool and dismount the bearing.

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7.1 Mounting bearing 21312 E/C3 on shaft no. 3

Heat spherical roller bearing 21312 E/C3 with Induction HeaterTMBH 1, as described in point 6.1. When the bearing has reachedthe desired temperature, push it onto the shaft against the abutmentface until an interference fit is obtained.

7.2 Dismounting bearing 21312 E/C3 on shaft no. 3

Place bearing puller TMMA 3 around spherical roller bearing21312 E/C3 and release the spring of the puller and tighten thepuller by hand. Connect high pressure pipe with adapter on the shaft.Connect the quick connection nipple to the adapter and connect pump729124 SRB to quick connection nipple and pump oil between bearingand bearing seat until oil escapes at the end of the contact surface allaround the shaft. While pumping, dismount the bearing by means of thepuller.

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8. (Dis)Mounting procedures for shaft no.4

8.1 Mounting bearing 21312 EK/C3 on shaft no. 4

During drive up the original radial clearance of the bearing is reduced.The easiest and best way of mounting spherical roller and CARBbearings is with the help of the SKF Drive-up Method.Carefully read the step by stepmounting procedure of MP512(Accurate axial drive-up ofspherical roller bearings).Determine whether one or twosurfaces slide during mounting.Lightly oil all mating surfaces with

a thin oil e.g. SKF LHMF300 and carefully put the bearingon the shaft. Rotate the outer ringa few times to allow the rollers toassume their correct positions.Drive the bearing up to thestarting position by applying theHMV 12E-nut pressure found inthe table. Monitor the pressureby the gauge on the SKFHydraulic Pump 729124 SRB.Drive the bearing up the taper tothe required distance from theaxial drive-up starting position.This is monitored by the SKF DialIndicator TMCD 5P, which can beput into the hole of the HMVE-nut.Remove the hydraulic nut after

mounting and screw the shaft nutKM 12 to locking washer MB 12.Return the piston of the hydraulic nut in a vice, having pump 729124SRB (with open release valve) still connected. The oil will flow back intothe pump.

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8.2 Dismounting bearing 21312 EK/C3 on shaft no. 4

Connect pump 729124 SRB viaquick connection nipple 729100to the shaft end. By pumping oil

into the oil duct and distributiongroove, an oil film will appearbetween bearing inner ring andshaft. Release the oil pressure byturning the release valve at thepump. Use hook spanner HN 12to loosen and remove shaft nutKM 12 and locking washerMB 12. Rescrew the shaft nut sofar that a gap of about two

coarses of the thread is leftbetween the bearing and the nut. Tighten the release valve of the pumpagain and build up a new oil film between bearing inner ring and shaft.The bearing will simply be shot off from its seating with force andwithout damaging the seat.

NOTE: Never dismount a bearing from a tapered seating by means ofthe Oil Injection Method without having an hydraulic nut or anSKF locking nut screwed onto the shaft end.

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The tightness of the fit between bearing, adapter sleeve and shaftdepends on how far the bearing is pressed onto the tapered seat. Pushthe distance ring and the adapter sleeve onto the shaft. Then push thespherical roller bearing onto the adapter sleeve until the abutment faceof the distance ring is reached. Screw hydraulic nut with piston facingthe bearing onto the adapter sleeve. For mounting the spherical rollerbearing 21312 follow the instructions described in point 8.1. Place thelocking washer and screw on the sleeves nut. Press the piston of thehydraulic nut back, as described in point 8.1.


Remove the sleeves nut with hook spanner HN 12 and take away thelocking washer. Then screw the hydraulic nut onto the adapter sleeve, sothat the piston is directed away form the bearing. Screw the hydraulicnut only so far that a gap of about two courses of the thread is leftbetween the bearing and the nut. This gap is required to move theadapter sleeve so far that the bearing gets detached from the adaptersleeve. Screw the support nut on the shaft until it is in contact with the

hydraulic nut piston. Pump oil into the hydraulic nut with pump 729124SRB, and the bearing will slide from its seat. Press the piston of thehydraulic nut back, as described in point 8.1.

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The tightness of the fit between bearing, withdrawal sleeve and shaftdepends on how far the bearing is pressed onto the tapered seat.Therefore, it is necessary to measure the radial clearance of theunmounted spherical roller bearing. Place the bearing upright and rotatethe inner ring a few times to allow the rollers to assume their correctpositions. The clearance is measured, using the feeler gauge 729865 A,between the outer ring and the uppermost rollers.After determination of the radial clearance (values of GeneralCatalogue), the spherical roller bearing is pushed manually on the shaftuntil the abutment face of the distance ring is reached. Push the

withdrawal sleeve under the bearing as far as possible. Screw on locknut KM 10 by the Lock Nut Socket TMFS 10 until the bearing is pressedfar enough on the withdrawal sleeve. This is the case when the requiredreduction is obtained.Since the bearing is positioned on the shaft, the clearance is nowmeasured between the lowest rollers and the outer ring.Remount shaft locknut KM 10 to locking washer MB 10. Finally, checkagain the clearance of the bearing.


Unscrew the KM 10 Lock nut and take away the locking ring MB 10 fromthe shaft. Screw Lock Nut KM 13 on the withdrawal sleeve using the HN13 spanner. Use as much force as needed to dismount spherical rollerbearing 21312 EK/C3.

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11.1 Mounting self-aligning ball bearing 1209 EKTN9/C3on shaft no. 7

Take the shaft out of the holder. Place adapter sleeve H 209 over theshaft. Place self-aligning ball bearing 1209 EKTN9/C3 and lockingwasher MB 9 over the adapter sleeve. Hand tighten the assembly withlocknut KM 9. Place the shaft and bearing assembly in its holder so thatthe bearing assembly fits in its housing. Tighten the nut according to theinstructions of the TMHN 7.

11.2 Dismounting self-aligning ball bearing 1209 EKTN9/C3on shaft no. 7

Unlock locknut KM 9 a few turns. Gently hammer against thedismounting adapter which is placed against the bearing inner ring, sothat the bearing will slide from the sleeve. The bearing assembly is loosenow and can be taken away.

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Shaft no. 8 will show the big differences in dismounting forces betweenball bearing 6212, which will be dismounted without Oil InjectionMethod, and ball bearing 6214, which will be dismounted with Oil

Injection Method.

12.1 Mounting ball bearing 6214 on shaft no. 8

Mounting bearings with cylindrical bore can best be done by heatingthem. Bearings should be heated about 80 to 90C above thetemperature of the shaft, but should never exceed 125C. To handle thehot bearings use clean gloves (TMBA G11) or clean lint-free cloth.Heat ball bearing 6214 on the Induction Heater TMBH 1. When thebearing has reached the desired temperature, push it onto the shaft

seat without misalignment. Press the bearing inner ring against theabutment face until an interference fit is obtained.

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12.2 Dismounting ball bearing 6214 on shaft no. 8

Place bearing puller TMMA 3 around ball bearing 6214 and release thespring of the puller. Connect high pressure pipe with adapter on theshaft. Connect the quick connection nipple to the adapter and connect

pump 729124 SRB to quick connection nipple and pump oil betweenbearing and bearing seat until oil escapes at the end of the contactsurface all around the shaft. While pumping, dismount the bearing bymeans of the puller.

12.3. Mounting ball bearing 6212 on shaft no.8

Ball bearing 6212 should be mounted the same way as ball bearing6214 (see point 12.1).

12.4. Dismounting ball bearing 6212 on shaft no. 8

After shaft and bearings are cooled down, place bearing puller TMMA 3around ball bearing 6212 and pull the bearing off.

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13.1 Mounting bearing NU 2212 ECP on shaft no. 9

Slide away inner ring from bearing NU 2212 ECP and heat it withInduction Heater TMBH 1, as described in point 12.1. When the ring hasreached the desired temperature press it against the abutment face ofthe shaft until an interference fit is obtained.

13.2 Dismounting bearing NU 2212 ECP on shaft no. 9

Take away cage and roller assembly. Coat the inner raceway with anoxidation resistant oil, which can stand heating. Heat aluminium ringTMBR NU2212EC to temperature of approx. 280C by means of a hotplate or an open fire. (An ordinary kitchen hot plat can do this job). Placethe aluminium ring round the bearing inner ring and press the handlestogether. Wait for a short time, then try to rotate the tool with ring until itcomes loose from the shaft, then pull it off. Carefully open the handlesand take away the bearing inner ring.

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In line with our policy of continuous development ofour products we reserve the right to alter any part ofthe above specification without prior notice.

SKF Maintenance Products Copyright SKF 2002/04

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