Gravely Convertible 7.6 Service Manual page 22

6. Lift off clutch housing and remove shims.
7. Remove internal parts of differential mechanism.
Carefully examine all parts for damage or abnormal wear.
Check for scoring on back of shifting train pinion. Check
the spider arms for scoring, check the bore of
gears for scoring.
8. Examine the internal surface of the bronze gear for wear.
An even wear pattern is normal. Check the pinned gear and
differential gear for wear or damage.
9. Reassemble the differential mechanism, using new thrust
bearings, if any other parts are replaced. Assemble on two
opposite spider arms, in this sequence, spider gear, shifting
train pinion, needle thrust bearings, needle thrust race,
shims, then spider thrust washer. On two remaining spider
arms, assemble in this sequence, spider gear and thrust
spacer. Install in bronze gear.
10. Using a differential gear, check shimming of spider gears.
Adjust shims so that gear sits solid on all four spider gears.
11. Install shims, differential gear, shifting ear and clutch
housing on worm ear. Install bolts using new locking
plates. Torque to 20 ft. lbs.
12. Check end play of shifting gear .0 - .010 maximum. If
necessary, remove clutch housing and adjust shims
accordingly. Reinstall clutch housing, bolts and locking
plates. Torque to 20 ft. lbs. Secure locking plates to bolts.
Gears should turn freely.
13. Using wire cutters, remove wire securing bolts from each
side of worm gear.
14. Secure differential assembly in a vise, shifting gear side
up.
15. Remove bolts securing clutch housing to worm gear,
remove clutch plate, gears and shims.
16. Turn worm gear over and remove pinned housing and
gears.
17. Tilt differential mechanism and remove from worm gear.
The mechanism does not ride on the inside surface of the
gear.
18. Disassemble the differential mechanism- carefully check
the bore of the gears and the spider arms for scoring check
the backs of the shifting train pinions.
Fig. 31
19. Reassemble the differential mechanism using new
thrust needle bearings if any other parts were replaced.
On the two spider arms with snap ring grooves at the
end, assemble in this sequence, spider gear, shifting
train pinion, bearing, spacer and snap ring. On the
other two arms assemble in this sequence: spider gear,
race, bearing, spacer and snap ring.
20. Tilt the differential mechanism and install it in the
worm gear.
21. Install the pinned gear and differential gear on the
pinned housing and install it on the worm gear.
Torque bolts to 20 ft. lbs.
22. Turn worm gear over and install the clutch housing,
with differential gear, shifting gear and shims on the
worm gear. Torque bolts to 20 ft. lbs.
23. Check end play of shift gear .00 - .010 maximum.
Remove clutch housing and adjust shims as necessary.
Torque bolts to 20 ft. lbs.
24. Insert wire through one bolt head, cross and insert
through other, then twist ends together securely. Trim
twist to 1/z inch length. Repeat, securing other bolts.
Repeat on bolts on other side of gear.
25. Install differential on L.H. axle in L.H. axle housing.
(Pinned housing side of differential assembly in axle
housing.)
Be sure thrust pin is in place in the differential
assembly so it will be between the axles.
26. Place equal amount of shims and a shellacked gasket
on each axle housing. Install L.H. axle housing and
differential assembly in tractor. Secure axle housing to
tractor.
27. Install R.H. axle housing on tractor, being sure the
shifting clutch fits on the shifting gear. Secure axle
housing to tractor. Torque bolts to 45 ft. lbs.
28. Remove the engine and high-low planetary or the
advance casting and the forward-reverse planetary.
Using a screwdriver or similar tool, check the
differential assembly for play. Running clearance
should be .008-.012. Adjust by adding or removing
au equal amount of shims from each axle housing.
Adjust axles for .008-.012 end play. Add or remove
shims behind the bearing cap.
Fig. 32
21