Spicer Tandem Drive Axle Dual Range & Double Planetary 34,000-45,000 lbs - Manual (Page 70)

Air Shift Unit Replacement
Remove Unit Install Unit
Disconnect air line at shift unit
1. Lubricate
shift fork. Slide seal 3. When axle is installed in vehi-
cover. Remove nuts, flat washers and spring assembly over fork and cle, fill shift unit housing to level
and piston air-shift unit from differ- seal on differential carrier studs. of filler plug with SAE 10 oil or
ential carrier. Shift axle into Low Range. automatic transmission fluid (see
NOTE: When shift unit is removed, 2. Place shift unit on mounting
Lubrication on
following page).
provide container to catch oil that studs and make certain shift fork Coat threads of filler plug with
escapes from reservoir. Remove actuating lever engages slot in shift
sealer and install plug.
shift fork seal and spring. fork. Install flat washers and stud
4.
Connect air lines to shift unit
nuts. Tighten nuts to 55-61 ft-lbs. cover.
I
(74-82 Nm).
Air Shift Unit Overhaul
Disassemble Unit
1.
Remove cap screws, lock
washers, cover and gasket from
housing. Drain lubricant.
2.
Remove bolts, locknuts, cover
at piston end of housing.
Remove "O" ring.
CAUTION:
DURING THE
FOLLOWING PROCEDURE, THE
PISTON WILL POP OUT OF
HOUSING UNDER SPRING
PRESSURE. EXERCISE CAUTION
TO PREVENT POSSIBLE INJURY.
3.
Remove locknut, flat washer,
and piston from push rod.
Remove "O" ring and felt oilers
from piston.
4.
Remove compression spring
and piston stop from bore of shift
unit housing.
5. Remove clevis pin, then
remove
push rod from shift unit housing.
Remove "O" Ring from push rod.
6.
Remove actuating lever and pin
assembly from shift unit housing.
Do not disassemble actuating lever.
Parts Inspection
Shift Fork Seal
- Inspect shift fork
seal for defects and tight fit on
shift fork. A spring is used to
assure a closer fit of seal around
shift fork. If this spring is not
present on axle being serviced,
install one when reassembling unit.
"O" Rings, Felt Oilers and Gasket -
Replace "O" rings, felt oilers
and cover gasket when piston air-
shift unit is disassembled for repair.
Compression Spring -
Inspect
spring for distortion, cracks, or
other visual defects, Replace a
faulty spring.
Actuating Lever and Pins -
Inspect lever pins and bearings
for worn or grooved condition.
Inspect actuating lever and pus
rod for worn or elongated holes
at point where they are connected.
Replace faulty parts.
Piston
- inspect piston friction
surface for worn, grooved or
damaged condition which will
affect the piston movement in
cylinder. Replace a faulty piston.
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