Spicer Drive Axle Wheel Differential Lock - Manual (Page 5)

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Overview
Operation Overview
Dana's wheel differential lock is driver-controlled and operated by the carrier
mounted air-actuated shift unit. In operation, it positively locks the wheel dif-
ferential to provide improved traction under adverse road conditions. The dif-
ferential lock is controlled through an electric switch or air valve mounted in
the cab. The locking mechanism is air operated to engage a mechanical clutch
that locks the wheel differential. It is spring operated to disengage the lock and
permit the wheel differential to operate normally.
Air pressure applied to the shift cylinder moves the piston, push rod, shift fork
and sliding clutch engages the fixed clutch mounted or machined into the
wheel differential case half. The sliding clutch is splined to the axle shaft.
Engaging the two clutches locks the axle shaft to the differential case half,
which, in turn locks the wheel differential.
Disengaged Position
Note: Zero air pressure to shift system, the spring is keeping shift assembly in
disengaged position. Sliding clutch is splined to the axle shaft.