Spicer Drive Axles Service Manual Axle Shift Systems, 2-Speed Single Rear Axles - Manual (Page 23)

20
Air Shift System
General Information
Air Shift Unit
Description and Operation (Shift Unit)
The Air Shift Unit is engineered for efficient performance and
built for reliable, service-free operation.
Operation of the unit is as follows: The shift unit is mechani-
cally connected to the axle shift fork and shifts axle into Low
or High range.
The unit consists of an air chamber, piston, compression
spring and mechanical linkage. When air is admitted to the
chamber or cylinder, the piston travels downward against a
compression spring, transferring motion through a push rod
and actuating lever to the shift fork, shifting the axle into High
range. Exhaust of air pressure permits the heavy-duty spring
to return the axle gearing to Low range.
Note: A harsh environment kit (consisting of a vent filter and
fittings) is available for shift units operating in unusually
wet or dirty conditions. For additional information con-
tact Dana Service Support.
Note: Air Shift Units are also used on Spicer Controlled Trac-
tion Differential and Dual Range Tandem Axles. Refer to
Spicer Service Manuals EA-47, EA-44 and EA-45.
Lock Nut
Housing Cover
(Piston End)
“O” Ring
Lock Nut
Washer
Piston
“O” Ring
Felt Oilers
“O” Ring
Push Rod
Compression
Spring
Piston
Stop
Cover
Bolt
“O” Ring
Housing
Housing Bearing
Actuating Lever, Pin,
and Block Assembly
Clevis Pin
Cover
Bearing
Actuating
Lever Pin
Cap Screw
(Plug)
Cover
Gasket
Housing
Cover Screw and
Washer
Assembly
Oil Filler and
Level Plug