Spicer Tandem Drive Axle Dual Range & Double Planetary 34,000-45,000 lbs - Manual (Page 69)

Axle Shift System Components
Air Shift Unit
I
Description and Operation
Air Shift Unit-Exploded View
(Forward Axle Unit Illustrated)
The Piston Air-Shift Units are The unit consists of an air chamber, shifting the axle into High range.
engineered for efficient perform- piston, compression spring and Exhaust of air pressure permits the
ante and built for reliable, mechanical linkage. When air is heavy-duty spring to return the axle
service-free operation. admitted to the chamber or cylinder, gearing to Low range.
Operation of each unit is
the piston travels downward against
as follows: The shift units are
a compression spring, transferring
mechanically connected to the axle
motion through a push rod and
shift forks and shift axles into Low
actuating lever to the shift fork,
or High range.
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