Driver controlled differential lock – Spicer Drive Axles Service Manual Wheel Reduction Drive Axles (EA-50) User Manual

Page 26

DRIVER CONTROLLED DIFFERENTIAL LOCK

INTRODUCTION

The Spicer driver-controlled differential lock provides
exceptional traction and pulling power in both slippery
driving conditions and heavy-duty applications. Such
applications include: pulling double trailers, construction,
and refuse collection. In adverse road conditions, the
Spicer driver-controlled differential lock also protects
against spin-out and shock loading.

The differential lock is activated by a cab-mounted
switch. The lock operates through an air-actuated shift
assembly that is located on the right-side of the differen-
tial carrier. When the differential lock is engaged, an air-
actuated piston moves the clutch collar along splines of
the axle shaft onto mated splines of the differential case.
See F

See F

See Figur

igur

igure 1

e 1

e 12.

When the differential case and clutch collar splines are
engaged, the wheel differential is positively locked. The
shift fork trips an electric switch unit that signals a cab
indiactor light for driver verification. There is no differ-
ential action between the rear drive wheels of the axle
when the differential is positively locked, resulting in
maximum traction to the rear drive wheels. Normal
differential action occurs between the rear drive wheels
of the axle when the differential lock is disengaged. The
cab-mounted indicator light should be off at this time.

Ring and Pinion

Gears

Axle Housing

Differ

Differential

ential

Gears

Differ

Differential

ential

Case Half

se Half

Spline

Splinesssss

Right

Right-Side

-Side

Axle Shaft

Pist

Piston

Plugged Hole (F

Plugged Hole (For

Manual Eng

Manual Engagement)

agement)

Vehicle Air

ehicle Air

Supply Inlet

Electric Switch Unit

Clutch Collar

(Eng

(Engaged)

aged)

Shift F

Shift Fork

ork

DIFFERENTIAL LOCK IDENTIFICATION

FFFFFigur

igur

igure 1

e 1

e 12