Adjustment For The Final Drive Bearings [PDF]

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D7G TRACTOR / POWERSHIFT / 92V02127-11897 (MACHINE) POWERED BY ... Page 1 of 8



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Previous Screen Product: TRACK-TYPE TRACTOR Model: D7G TRACK-TYPE TRACTOR 92V Configuration: D7G TRACTOR / POWERSHIFT / 92V02127-11897 (MACHINE) POWERED BY 3306 ENGINE



Disassembly and Assembly D7G TRACTOR POWER TRAIN Media Number -SENR7119-02



Publication Date -01/02/1983



Date Updated -14/10/2004 SENR71190014



Adjustment For The Final Drive Bearings SMCS - 4059-11 ; 4059; 4075-12



Adjustment For The Final Drive Bearings



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1. Loosen bolt (2) and open track adjuster access panel (1)



The adjuster cylinder for the track is under high hydraulic pressure. Do not visually inspect the relief valve to see if grease is released when it is open. Look to see that the track has loosened. Use this warning any time the tracks are loosened or tightened. 2. Loosen the track as follows:



a) Turn relief valve (3) one turn counterclockwise to permit grease to be released from the vent hole below the relief valve. If the track does not loosen, go to Step b. b) Turn fill valve (4) one turn counterclockwise to permit grease to be released from the vent hole below the fill valve. If the track still does not loosen, start the machine and move it forward and backward. If grease is still not released go to Step c. c) Put a 3 in. diameter by 3.5 in. long (76.2 mm) diameter by (88.9 mm) long slug in position on the sprocket teeth. The slug must be in a position where it will make contact with the track bushing when the sprocket is turned in reverse. Move the machine to the rear. This will put tension on the track and move the front idler and track adjuster to the rear against the force of the recoil spring. This will push grease out of the vent holes.



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Typical Example



3. Lift the machine so the track will clear the floor and install tooling (A) and (B) under the machine. The sprocket assembly must turn while the adjustment to the final drive bearing is made.



4. Remove guard (5) from the track roller frame. 5. Remove cap (6) from the support.



6. Remove gasket (7).



7. Remove bolt (8) and the nut. Remove lock (9).



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NOTE: All the parts must be clean. The bearings must have final drive compartment oil on them. The adjusting nut must turn freely on the threads and the bearing cage must move freely in the holder. 8. Install tooling (C) as follows:



a) Install trunnion group (12) [use holes (Y)] on the track roller frame support assembly (10). The trunnion arm with the identification "X" must be fastened to the first hole with threads clockwise from grease fitting (11). See decal (13).



b) Install driver group (15) on the trunnion. Pin (14) must be in the retracted position as shown.



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c) Push pin (14) down between two lugs on adjusting nut (16).



9. Install tooling (D). Start the machine and turn the sprocket slowly while adjusting nut (16) is tightened with tooling (C) and (D) to a torque of 2500 ± 300 lb.ft. (3380 ± 410 N·m).



10. Tighten nut (16) in a counterclockwise direction. On the left side of the machine, the nut is tightened in a counterclockwise direction also. 11. Remove the 9S7351 Torque Wrench and install a ratchet wrench. Turn adjusting nut (16) clockwise (about six to ten lugs) to lower the torque to less than 350 ± 10 lb.ft. (475 ± 14 N·m). NOTE: If it is not possible to get a torque below 350 ± 10 lb.ft. (475 ± 14 N·m) after the adjusting nut is loosened, a separation of the tracks must be made to make the adjustment of the bearing. 12. Remove the 5P3508 Torque Multiplier and install tooling (E). Tighten adjusting nut (16) to a torque of 350 ± 10 lb.ft. (475 ± 14 N·m).



13. Move the driver group out of the way and put a mark (18) on adjusting nut (16) and holder assembly (17) in alignment with each other. Put a mark (19) on holder assembly (17) counterclockwise from mark (18) [distance (Z)] that is 5.84 ± .06 in. (148.3 ± 1.5 mm) from mark (18).



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14. Install driver group (15) on the shaft of the trunnion group. 15. Install torque multiplier (20) [part of tooling (D)] and tighten the adjusting nut until marks (18) and (19) are in alignment.



NOTICE If necessary, tighten adjusting nut (16) more to install lock (9) in one of the notches of the adjusting nut. Do not loosen adjusting nut (16).



16. Install lock (9) and the bolt (8) and nut that holds it in place. 17. Remove tooling (C).



18. Install the gasket and cap (6). 19. Install guard (5).



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Typical Example



20. Remove tooling (A) and (B) from under the machine.



21. Tighten relief valve (3) and fill valve (4) to a torque of 25 ± 5 lb.ft. (35 ± 7 N·m). 22. Make an adjustment of the track. See SPECIFICATIONS.



23. Close track adjuster access panel (1) and tighten bolt (2).



Copyright 1993 - 2010 Caterpillar Inc.



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