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TM 10-3930-671-24
B. Trial Wheel End Assembly for
Differential Bearing Preload Check
(Pinion Gear Not Installed)
The purpose of this trial assembly is to determine the
total combined shim pack thickness to be installed under
the differential carrier bearings when replacement (new)
parts have been installed. Later procedures for checking
gear backlash and tooth contact are used to determine
the individual shim pack thickness to be installed under
each bearing cup.
1 - No New Parts Installed
If all original parts are reused, use original shim pack
thickness and proceed to: D. Pinion Gear Installation
2 - New Parts Installed
If differential carrier, carrier bearings, or wheel end
housings have been replaced (new), use the following
procedure:
1.
Install the differential bearing shims and tapered
bearing cone on the wheel end housing. Start
with original shim pack thickness.
Note
Force a small shop cloth or rag into the
differential side gears and pinions to prevent
them from turning.
2.
Position the differential in the transmission case.
3.
Mount wheel end housings to the transmission
case in position as marked at disassembly. Be
sure differential and bearing cups are aligned
with bearings on wheel end housing. Install
attaching bolts and washers and tighten fully.
4.
Temporarily install axle shaft into side gear of
the differential (w/side gear blocked to prevent
turning).
5.
Measure the differential bearing rolling-torque
pre-load with a torque wrench.
Correct preload torque: 15-20 lb-in. (1.7-2.3 N.M.)
NOTE
Remove wheel end housings, remove bearing
and add or remove differential bearing shims
behind bearing cone to obtain the proper preload
torque. Repeat above procedure.
6.
After correct bearing preload is set, remove the
axle shaft and wheel end housings.
7.
Remove differential assembly.
Remove shop cloth that was used to block gears from
turning.
F-367
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