Wheel differential lock – Spicer Convertible Tandem Axles User Manual
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Theor
y of Operation
Theory of Operation
Wheel Differential Lock
The Spicer Wheel Differential Lock is an optional feature for
Spicer Axles. In operation, it positively locks the wheel differen-
tial, to provide improved traction under adverse road condi-
tions.
The differential lock is driver-controlled through an electric
switch or air valve mounted in the cab. The locking mecha-
nism is air-operated to engage a mechanical clutch and lock
the wheel differential. It is spring-operated to disengage the
lock and permit the wheel differential to function normally.
The wheel differential lock consists of three major assemblies.
•
Shift Cylinder Assembly: Operates a shift fork and
push rod assembly.
•
Shift Fork and Push Rod Assembly: Engages and
disengages the differential lock curvic clutch assem-
bly.
•
Curvic Clutch Assembly: Consists of a sliding clutch
splined to an axle shaft and a fixed clutch which is
splined to the differential case hub.
The differential lock also includes a selector switch (electric)
which senses clutch engagement and sends an electrical sig-
nal to a cab mounted indicator light (or an audible signal
device).
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