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TM 10-3930-671-24
3- Ring and Pinion Gear Replaced
If only the ring and pinion were changed, the following
procedure is used:
SHIM PACK THICKNESS CALCULATIONS Use a
micrometer to measure the original shim pack thickness.
1.
If the new pinion mounting distance (etched on
ring gear) is larger than the pinion mounting
distance (etched on original ring gear), you must
subtract the difference (see following example):
5.904
etched on new ring gear
-5.901
etched on original ring gear
0.003
difference
D.
Pinion Gear Installation
1.
Install the pinion inner bearing cup shim pack
and bearing cup in the transmission case.
2.
If outer bearing is removed or replaced, install
outer pinion bearing cup in transmission case.
3.
Assemble the inner pinion bearing on the pinion
shaft.
4.
Position the output gear in the case with the long
hub of the gear outward as shown.
5.
Position the pinion shaft and inner bearing into
the case and through the output gear.
6.
Install the output gear retainer ring on the pinion
shaft. Be sure the retainer ring is fully seated into
the ring groove.
0.031
original shim pack
-0.003
difference
0.028
FINAL SHIM PACK (E)
2.
If the new pinion mounting distance is smaller
than the pinion mounting distance on the original
ring gear, you must add the difference (see
following example).
5.905
etched on new ring gear
-5.901
etched on original ring gear
0.004
difference
0.031
original shim pack
+0.004
difference
0.035
FINAL SHIM PACK (E)
7.
Assemble the outer bearing shims and outer p i
n ion bearing on the pinion shaft. If a new pinion
shaft is used, a nominal shim pack of .062 in.
(1.575 mm) can be used initially.
8.
Install the pinion shaft nut and tighten to torque
spec: 200-250 lb-ft. (271-339 Nom). Hold or
block the pinion shaft with a brass bar or similar
soft material to prevent the shaft from turning.
9.
With pinion shaft free to turn, use a torque
wrench to measure the pinion shaft bearing
rolling-torque preload.
Preload torque spec. 7-15 lb-in. (0.8-1.6 N-m)
NOTE
Remove pin ion shaft nut and bearing and add or
remove shims behind pinion shaft outer bearing
cone to set correct bearing preload torque.
F-369
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