Chevrolet 70 1969 Series, Shop Manual

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REAR AXLE 4-51
Figure 2 7 — In te r-A x le D ifferen tial C o v e r Installed
loosen adjusting screw 1/4 turn; then lock securely
with nut.
5. Recheck to assure m inim um clearance of 0.010 inches
- 0.015 inches during full rotation of drive gear.
IDLER GEAR AND SHAFT ASSEMBLY
(FORWARD AXLE)
1. Install snap ring in idler gear hub groove.
2. Press idler gear inner bearing cup into idler gear until
seated against snap ring.
3. Install idler gear bearing cup spacing sleeve in hub
against opposite side of snap ring (fig. 24).
4. Press opposite bearing cup into idler gear until seated
against spacing sleeve.
5. Install inner and outer bearing cones in gear with spa­
cers between cones.
6. Position idler gear assembly in adapter case (fig. 9)
with bearing cones aligned with idler shaft opening in
case.
7. T ap idler shaft through the adapter case and idler
gear assembly (fig. 25). Install idler shaft washer and
nut.
IDLER GEAR BEARING ADJUSTMENT
(FORWARD AXLE)
1. M oun t ad apter case in a vise with jaw s clam ping flats
on end of idler shaft.
2. Tighten idler shaft nut to 500 foot-pounds torque.
3. M o un t dial indicator to adapter case with stem
against face of idler gear.
4. The correct adjustm ent of idler gear bearings is zero
to .005 inches loose as indicated by dial indicator.
5. W henever end play of gear does not fall within these
limits, install a thicker or thinner spacer com bination
of spacer as required to obtain proper limits.
ADAPTER CASE INSTALLATION
(FORWARD AXLE)
1. Install helical drive gear bearing cup in ad apter case.
Allow cup to project slightly beyond surface of case
2.
Clean bolting surface of ad apter case and differential
carrier. Install new gasket to differential carrier.
3.
Position adapter case assem bly to differential carrier
and secure with ten cap screws and lock washers.
Tighten cap screws alternately and evenly to recom ­
m ended torque.
DRIVE GEAR INSTALLATION
(FORWARD AXLE)
1. Press bearing cones onto each end of helical drive
gear, if they were removed.
2. If removed, press bearing cup into bearing cage until
seated against shoulder.
3.
Install gear and bearing assem bly in case, with long
hub of gear tow ard front.
4.
Install cage and cup assem bly in case, using sam e
shim pack rem oved at tim e of disassembly.
5. Tighten cap screws to recom m ended torque. Use dial
indicator at end of gear to check end play, which
should be 0.001 inches to 0.005 inches. R em ove or
add shims between cage and adapter case to obtain
correct end play. Secure cap screws with lock wire
when correct adjustm ent has been obtained.
INTER-AXLE DIFFERENTIAL ASSEMBLY
(FORWARD AXLE)
1. Position thrust washer and rear side gear into rear
half of differential case.
2. Install spider with pinions and thrust washers over
rear side gear.
3.
Install forw ard side gear and thrust w asher over spi­
der pinions.
4.
Install front half of differential case being sure that
alignm ent m arks on case halves are m atching each
other.
5. Install cap screws holding tw o halves of case together.
C heck for free rotation of differential gears.
6. Tighten cap screws to recom m ended torque, then
check again for free rotation. Secure cap screws with
lock wire.
7.
Press bearing on front half of differential case, using
spacing washer between bearing and differential case.
INTER-AXLE DIFFERENTIAL
INSTALLATION (FORWARD AXLE)
1. Position inter-axle differential assembly in adapter
case (fig.
26).
2. T ap assem bly into place so th a t rear half of differen-
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L