POWER TRAIN
TM 5-3805-258-24-2
DISASSEMBLY AND ASSEMBLY
23.
24.
25.
26.
27.
FRONT AND REAR DIFFERENTIALS
Install the gasket and retainer (29) on housing
(21).
Install two 5/8”- 11 NC guide bolts in the car-
rier assembly. Install shims (30) of the original
thickness on the carrier assembly.
Fasten a hoist and put the pinion and housing
(21) on the carrier assembly. Do not install the
O-ring seal around housing (21) at this time.
Install three bolts the same distance apart to
hold housing (21) in the carrier assembly.
Make an adjustment of the differential bearing
preload and the gear clearance (backlash)
between the bevel gear and pinion as follows:
a)
b)
c)
d)
e)
Tighten the adjustment nuts until there is a
small amount of preload on the bearings.
Install tool group (D) on the bevel gear as
shown to check the gear clearance (back-
lash) at four locations around the bevel
gear 90° apart. Use the lowest indication
on tool group(D) as the correct gear clear-
ance (backlash) value. The correct gear
clearance (backlash) is 0.20 to 0.43 mm
(.008 to .017 in.).
If the gear clearance (backlash) is too
much, loosen upper adjustment nut (18)
and tighten lower adjustment nut (15) the
same amount to change the gear clearance
(backlash). If the gear clearance (back-
lash) is not enough, loosen lower adjust-
ment nut ( 15) and tighten upper adjust-
ment nut ( 18) the same amount to change
the gear clearance (backlash).
Tighten upper adjustment nut (18) until a
torque of 4.0 ± 0.6 N-m (35 ± 5 lb.in.) is
needed to turn the pinion shaft.
Check the gear clearance (backlash) again
as in Steps b and c.
Make a check of the tooth contact setting
between the bevel gear and pinion after the
gear clearance (backlash) and bearing preload
adjustments have been made as follows:
a) Put a small amount of Prussian blue, red
lead or paint on the bevel gear teeth. Turn
the pinion in both directions and check the
marks made on the bevel gear teeth.
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