Chevrolet 70 1969 Series, Shop Manual

Page: 149 / 913

REAR SUSPENSION 4A-10
Figure 12~lnier-Axle Air Shift Chamber Components (Baton)
long or black ribbed wire is attached to the bottom
terminal. On air shift units, disconnect air line.
IN S T A L L A T IO N
1. Check condition of rubber seal between
shift unit and carrier. This seal must be in good
condition as it prevents axle lubricant leaking into
shift unit.
N O T E : Seal bears lettering " B O T T O M - F O R ­
W A R D T A N D E M " and "B O T T O M ,- SIN G LE A N D
R E A R T A N D E M ," as indicated in insert of figure
11. Be sure seal is properly positioned at time of
installation.
2. On electric shift units install wires to out­
side terminals. The long black ribbed wire is at-
Figure 13— Inter-Axle Air Shift Chamber and Spring (Eaton)
tached to bottom terminal. Harness is clipped to
cable clip on housing. On air shift units, reconnect
air line.
3. With seal between carrier and shift unit in
place, install shift unit over carrier studs. Make
certain that the swivel block of the shift fork ac­
tuating lever fits into the slot in carrier shift fork.
Tighten stud nuts firmly.
4. Check installation by making a low and high
range shift. Ignition or control switch must be
turned on before check can be made.
N O T E : The shift unit motor is designed to be
reversible and runs equally well in either direc­
tion. If the terminal wires are reversed, the unit
will shift to L O W when the control switch button is
in HIGH position, and will shift to HIGH when the
button is in L O W position.
PIN IO N OIL SEAL REPLACEMENT
Several types of oil seal installations are used
on axles covered by this publication. One type has
the seal assembly installed directly into differential
carrier, while another has the seal installed in a
retainer which is then attached to carrier by cap
screws.
R E M O V A L
1. Remove propeller shaft from yoke at axle
as directed in "P R O P E L L E R S H A F T S " (SEC. 4D).
2. Hold propeller shaft yoke with holding bar
(fig. 7) while removing yoke retaining nut and
washer.
3. Use suitable puller in manner typically il­
lustrated in figure 8 to remove propeller shaft
yoke.
4. On axle where seal and retainer is pressed
into carrier, use available removing tool such as
punch or pry bar. Remove flat washer from coun­
terbore in carrier.
5. On axles where seal and retainer assem­
bly are attached to carrier by cap screws, remove
screws and washers, then lift assembly from car­
rier. N O T E : Some axles also have a cork seal in­
stalled in a groove in pinion cage, which should be
replaced.
IN S T A L L A T IO N
1. Before installing new seal, be sure that
differential carrier is cleaned of all deposits, such
as oil, dirt, etc.
2. On axles where seal and retainer is press­
ed into carrier, install flat washer in carrier, then
install strip sealer around carrier counterbore
and against washer.
3. Coat outer surface of seal retainer with
sealing compound, then position assembly in car­
rier. Use suitable available tool to press or drive
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L