Chevrolet 10 Series 1968, Service Manual

Page: 221 / 713

REAR SUSPENSION AND DRIVE LINE 4-52
Fig . 98—Removing Tool J-8 1 0 7
on shift fork. Check shift fork seal spring for dis­
tortion and tension.
2. Inspect housing for cracks and cylinder bore for
worn or grooved condition. Check piston stop cushion
for worn or cracked condition.
3. Inspect piston for a worn or grooved condition. Check
felt wipers for distortion. Felt wipers are oil soaked
to insure proper lubrication of the cylinder wall.
Check " O ” rings for worn condition.
4. Inspect compression spring for distortion, tension
and other visual defects. Check push rod and ac­
tuating lever for elongated holes, worn or cracked
conditions.
5. Inspect bearing surface on actuating arm for wear.
6. Inspect bushings in both the housing and housing
cover for wear.
7. Replace faulty or doubtful parts as required.
Reassem bly
1. Soak felt wipers in SAE-30 oil for one hour and in­
stall felt wipers, “ O” ring on piston and
“ O”
ring
on push rod.
2. Install piston stop cushion in cylinder bore if
removed.
3. Install actuating lever in housing.
4. Install piston and washer on push rod and torque
self-locking nut to 135 in. lbs. Install push rod,
spring and piston into cylinder bore using 9/16”
socket on piston self-locking nut and Tool J-8107
clamp to push piston into bore. Care must be taken to
insure proper fit of felt wipers and “ O” ring on
piston (fig. 98).
5. Install clevis pin at push rod and actuator arm
connection (fig. 97).
6. Install housing cover and gasket. Torque cover
screws to 100 in. lbs.
7. Install new
“ O”
ring in housing and install piston
housing cover. Torque piston housing cover nuts to
F ig . 99—Removing or In stalling Piston, Push Rod and
Compression Spring
120 in. lbs.
Installation
1. Place shift fork seal on differential carrier mounting
studs and install seal spring.
2. Place shift unit on mounting studs, make sure shift
fork actuating lever engages slot in shift fork. In­
stall stud nuts and lock washers. Torque nut to
60 ft. lbs.
3. Fill unit with lubricant.
4. Connect air line to shift unit and check shift unit
system for proper operation.
Drive Pinion Oil Seal (Figure 92)
Replacement
NOTE:
The pinion oil seal may be replaced
with the carrier assembly installed in the
vehicle.
1. Disconnect propeller shaft and remove pinion flange
and deflector.
2. Remove bolts retaining the oil seal retainer to car­
rier, and withdraw retainer from pinion.
3. Pry old seal from bore, using care so as not to dam­
age machined surface of retainer.
4. Thoroughly clean all foreign matter from seal con­
tact area in retainer.
5. Pack the cavity between the seal lips with a high-
melting point bearing lubricant, position seal on
suitable installer so that seal shoulders against
installer drive surface.
6. Press seal into retainer until it bottoms against
shoulder.
7. Carefully position seal retainer over pinion to pre­
vent damage to seal, and torque retaining bolts to
specifications.
8. Reinstall pinion flange and propeller shaft.
CHEVROLET TRUCK SERVICE MANUAL