Chevrolet 70 1969 Series, Shop Manual

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REAR SUSPENSION 4 A - 1 1
retainer into carrier until seated against flat
washer.
4. On axles where seal and retainer assembly
is attached to carrier by cap screws, install cork
seal in groove or gasket on pinion cage. N O T E : Be
sure that gasket does not cover any oil passage
holes in pinion cage.
5. Install oil seal and retainer assembly over
pinion and against pinion cage. Secure with cap
screws and lock washers, tightened alternately and
evenly.
6. Coat lip of oil seal with axle lubricant, then
install propeller shaft yoke, washer, and nut. Hold
yoke with holding bar (fig. 7) while tightening nut
to recommended torque.
R E M O V A L - R O C K W E L L
It is necessary to partially disassemble the
Rockwell electric two-speed unit to remove it
from axle housing. This may be accomplished in
the following manner:
1. Remove five screws from shift unit hous­
ing cover (refer to fig. 25), then remove cover.
This also drains the lubricant. After cover is
removed, note that drive screw nut is either at
top or bottom (fig. 11 A) depending on whether
axle is in "H IG H " or " L O W " range position.
2. Loosen shift unit-to-differential carrier
stud nuts (fig. 11 A) to remove preload from shift
unit spring.
3. Turn drive screw by hand to run nut to
midway position on drive screw as shown in figure
11B. This is necessary to prevent damage to
drive nut contact bumper.
4. Pull out lever shaft (fig. 11A). Disconnect
torsion spring from push rod, then remove spring
and spring winding lever (fig. 11B).
Figure IJ A — Shift Unit Cover Removed (Rockwell Axle)
Figure 11B— Torsion Spring Removal (Rockwell Axle)
5. Remove shift unit-to-differential housing
stud nuts, then remove shift unit from axle.
6. Remove wire cable clip from shift unit
cover. Note to which terminal each wire is
attached, then disconnect the two wires from shift
unit terminals.
N O T E : If wires are switched, the motor
direction will also be affected.
7. To install two-speed unit, reverse the
above procedure. Torque mounting stud nuts to
30-35 foot-pounds.
INTER-AXLE SHIFT UNIT
REPLACEMENT
The following information covers replacement
of inter-axle shift units as used on Eaton and
Rockwell tandem axles.
R E M O V A L - E A T O N (AIR)
1. Disconnect air line from shift cylinder
cover.
2. Remove four stud nuts and lock washers
attaching cover to inter-axle differential shift cyl­
inder. Remove cover and ring seal (fig. 12).
3. Remove nut, washer, and ring seal (fig. 12)
attaching piston to shift fork shaft.
4. Remove two cap screws and lock washers
attaching cylinder to differential carrier cover.
Remove cylinder and piston assembly (fig. 13).
Remove spring from fork shaft.
IN S T A L L A T IO N - E A T O N (AIR)
1. Position new gasket on differential carrier
cover, also install spring over shift fork shaft
(fig. 13).
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L