Cleaning And Inspection; Cam Unit Assembly; Adjustment Of The Differential - GMC T Series 1994 Repair Manual

CLEANING AND INSPECTION

Clean
• All parts with an approved solvent.
Inspect
• All parts for excessive wear and breakage.
• Pinion gear and side gear teeth for wear, cracks,
scoring, and spalling.
• Thrust washers for wear.
• The fit of the side gears on the axle shafts.
• Differential case for cracks and scoring.
• Thrust sleeve for excessive wear.
• All parts and replace them if necessary.
Important
• Do not replace the thrust sleeve unless neces­
sary.
• Side gear bore for scoring. If scoring is present,
Important
If any damage to the differential case is found,
the differential must be replaced.

CAM UNIT ASSEMBLY

Install or Connect (Figures 9 and 12)
1. Cam plate (33) to the side cam gear (40).
2. Wave washer (15).
3. Clutch plates.
• Alternate the plates and position the wave
washer as shown in figure 12.
4. Thrust sleeve (35).
• Press the thrust sleeve flush with the side gear
disc spline.
5. Guide clips (34) to the plates.
• Use a chassis grease in the clips to hold them
in place on the plates.
A. If the side gear or thrust sleeve has been
replaced, measure and record the overall
length of the gear to the back of the thrust
sleeve (35) including the side gear thrust
washer (36).
B. Compare this reading with the reading
obtained earlier.
C. If the new reading is more than 0.0762 mm
(0.003 inch) higher or lower than the origi­
nal, select a side gear thrust washer that will
return the reading closest to the original
reading.

ADJUSTMENT OF THE DIFFERENTIAL

• If it is necessary to replace the cam gear, the right
hand side gear, or the reaction blocks, the entire
differential must be adjusted. The differential is
adjusted using selective thickness thrust washers
behind each side gear, and selective thickness
thrust washers between the reaction blocks.
• It is important to build up the differential properly.
The proper clearance between parts is critical to
the operation of the unit.
• There are three adjustments needed:
(1) Left side gear backlash.
(2) Right side gear backlash.
(3) Thrust block clearance.
Right Side Gear Backlash Adjustment
1. Install the cam unit and side gear thrust washer
(36) to the right case half.
2. Clamp the cam unit in place using a set of wash­
ers, nut, and a bolt long enough to hold the cam
unit in place (figure 13).
3. Place the pinion gears and pinion thrust washers
on the pinion yoke.