Spicer Drive Axles Service Manual Axle Shift Systems, 2-Speed Single Rear Axles - Manual (Page 26)

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Air Shift System
Lubrication
Lubricant — Use SAE 10 motor oil* for temperatures above
0° F (-18° C). For temperatures below 0° F (-18° C), mix three
parts of SAE 10 motor oil with one part of kerosene. This cold
weather mixture can be safely used up to 32° F (0° C).
Note: *Commercially available automatic transmission fluid
may be used in place of SAE 10 motor oil. Automatic
transmission fluid can be used for all temperatures. Do
not mix kerosene with automatic transmission fluid.
Lubricant Check and Level — Each 20,000 miles or six
months, remove pipe plug in shift unit housing cover to check
lubricant level. Lube should be level with bottom of filler hole.
Lubricant Change — At least once a year remove shift unit
housing cover and drain old lubricant. Wash parts thoroughly
and air dry. Reinstall cover. Remove pipe plug in cover. Fill
through pipe plug opening until lube is level with bottom of
filler hole.
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.
“0” Rings, Felt Oilers and Gasket — Replace “0” rings, felt
oilers and cover gasket when piston air shift unit is disassem-
bled 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
push 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.