Chevrolet 70 1969 Series, Shop Manual

Page: 145 / 913

REAR SUSPENSION 4A-6
MAJOR UNIT REPLACEMENT
SINGLE AXLE REPLACEMENT
R E M O V A L
1. Jack up rear of vehicle until load is re­
moved from springs, then place blocks under
frame to prevent accidental dropping of vehicle.
2. Disconnect hydraulic or air brake lines,
whichever is used. Refer to BRAKES (SEC. 5).
3. Disconnect electric wiring or line from
power shift unit, if vehicle is equipped with a 2-
speed axle.
4. Disconnect propeller shafts as directed in
"P R O P E L L E R S H A F T S " (SEC. 4D).
5. Disconnect torque or radius rods, if used,
as directed in " R E A R SPRINGS" (SEC. 4B).
6. Disconnect spring U-bolts as directed in
" R E A R SPRINGS" (SEC. 4B).
7. Roll axle out from under vehicle, then re­
move wheels, hubs, and bearings as directed in
" R E A R HUBS A N D BE ARING S" (SEC. 4C).
8. Whenever another axle is to be installed
instead of the one removed, it may be necessary
to remove two speed shift unit, and brake chambers.
Refer to respective sub-sections for instructions.
IN S T A L L A T IO N
1. If brake chambers or two-speed shift unit
have been removed, they should be reinstalled as
directed in respective sections.
2. Install hubs, wheels and tires as directed
in " R E A R HUBS A N D BE ARIN G S" (SEC. 4C). Roll
axle into position under vehicle.
3. Connect springs to axle as directed in
" R E A R SPRINGS" (SEC. 4B).
4. Reconnect torque rods as directed in "R E A R
SPRINGS" (SEC. 4B). On some vehicles torque rods
are adjustable to secure proper axle alignment.
5. Reconnect propeller shafts as directed in
" P R O P E L L E R S H A F T S " (SEC. 4D).
6. Reconnect electric wiring or line at power
shift unit, if vehicle is equipped with a 2-speed
axle.
7. Reconnect air brake lines as directed in
BRAKES (SEC. 5).
8. Check lubricant level and fill with type and
grade of lubricant in manner instructed in LUBRI­
C A T IO N (SEC. 0). Some types of axles require
additional lubricant at pinion cage when filled in­
itially or after overhaul.
9. Remove blocks and lower vehicle to the
ground. Retighten spring U-bolts as instructed in
"R E A R SPRINGS" (SEC. 4B).
10. After all installation procedures have been
completed, check air lines for leaks, also test
brakes for proper application.
TANDEM AXLE REPLACEMENT
R E M O V A L
1. Jack up rear of vehicle until load is re­
moved from springs, then place blocks under frame
to prevent accidental dropping of vehicle.
2. Disconnect air brake lines at brake cham­
bers. Refer to BRAKES (SEC. 5).
3. Disconnect electric wiring or air line from
power shift unit, if vehicle is equipped with a 2-
speed axle.
4. Disconnect air line from inter-axle differ­
ential lock shift cylinder.
5. Disconnect propeller shafts as directed in
"P R O P E L L E R S H A F T S " (SEC. 4D).
6. On Hendrickson type suspension, disconnect
axle housing from equalizing beam as directed in
"R E A R SPRINGS" (SEC. 4B).
7. On Page and Page type suspension discon­
nect axle housing from spring as directed in "R E A R
SPRINGS" (SEC. 4B).
8. Disconnect torque or radius rods as direc­
ted in " R E A R SPRINGS" (SEC. 4B).
9. Roll axle out from under vehicle, then re­
move wheels, hubs, and bearings as directed in
" R E A R HUBS A N D BE AR IN G S" (SEC. 4C).
10. Whenever another axle is to be installed,
it may be necessary to remove two speed shift unit
and brake chambers as directed in respective
sections.
IN S T A L L A T IO N
1. If brake chambers or two-speed shift unit
have been removed, they should be reinstalled as
directed in respective sections.
2. Install hubs, wheels and tires as directed
in " R E A R HUBS A N D BE AR IN G S" (SEC. 4C). Roll
axle into position under vehicle.
3. On Hendrickson type suspension connect
axle to equalizing beam as directed in " R E A R
SPRINGS’tSEC. 4B).
4. On Page and Page type suspension connect
axle housing to spring as directed in " R E A R
SPRINGS" (SEC . 4B).
5. Reconnect torque rods as directed in " R E A R
SPRINGS" (SEC. 4B). On some vehicles torque rods
are adjustable to secure proper axle alignment.
6. Reconnect propeller shafts as directed in
"P R O P E L L E R S H A F T S " (SEC. 4D).
7. Reconnect electric wiring or air line at
power shift unit, if vehicle is equipped with a 2-
speed axle.
8. Connect air line at inter-axle differential
lock shift cylinder.
9. Reconnect air brake lines as directed in
BRAKES (SEC. 5).
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L