Installing Thrust Screw - GMC 1982 Light Duty Truck Service Manual

Fig. 4B5-26-Fitting Bearing Cups
5. Install flat washers and capscrews. Tighten stud nuts or
capscrews to correct torque.
A djusting D ifferen tial Bearing Preload
1. Using dial indicator at backface of gear, loosen the
bearing adjusting nut on the side opposite gear only
sufficient to notice end play on the indicator (Fig. 4B5-
28).
2. Tighten the same adjusting nut only sufficient to obtain
.000 end play.
3. Check gear for runout. If runout exceeds .008 ", remove
differential and check for cause.
4. Tighten adjusting nuts one notch each from .000 end
play to preload differential bearings.
Fig. 4B5-27--lnstalling Bearing Caps
Checking Backlash
If the drive gear is not going to be replaced, use the
established backlash recorded before disassembly. For new
gears, the new backlash should be initially set at .010".
Adjust backlash by moving the gear only. This is done by
backing off one adjusting ring and advancing the opposite
ring the same am ount (Fig. 4B5-29). Install cotter keys.

Installing Thrust Screw

1. Remove carrier from stand and position with back face
of hypoid or spiral bevel gear upward.
2. Remove adjusting screw and lock nut.
3. Install thrust screw and lock nut and tighten thrust
screw sufficient to locate thrust block firmly against
back face of hypoid gear.
4. To secure the correct adjustment of .010" - .015"
clearance, loosen adjusting screw (or thrust screw) 1/4
turn and lock securely with nut (Fig. 4B5-30).
5. Recheck to assure m inim um clearance of .010"
during full rotation of bevel gear.
Fig. 4B5-29--Checking Backlash
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