Chrysler Vehicle User Manual page 122

TJ
DIFFERENTIAL - LOCKER
DESCRIPTION
The differential is a Locker differential, that pro-
vides a positive mechanical connection between the
right and left axle when engauged. The Locker differ-
ential uses a dog clutch to connection the right and
left axle.
OPERATION
The Locker differential is activated by the axle lock
switch located on the dash panel. When the switch is
activated, an air pump with a built-in pressure reg-
ulator sends 5 PSI of air pressure to a accuator dia-
phragm in the differential housing. The diaphragm
then engages a dog clutch and a position switch. The
dog clutch has one gear attached to the differential
case and another gear attached to a differential side
gear. When the dog clutch is engaged the right and
left wheels turn at the same speed. The position
switch lights a lamp on the dash to indicate the sys-
tem has been engaged. The Locker differential works
as standard differential when not engaged.
NOTE: The differential is serviced as an assembly,
the diaphragm and indicator switch are serviced
separately. The differential case must be removed
to service the diaphragm actuator and indicator
switch.
DIAGNOSIS AND TESTING
UNLOCKED
(1) Block tires opposite the axle to be tested to pre-
vent the vehicle from rolling.
(2) Place transfer case in 4WD Low and automan-
tic transmission in Park (1st gear if manual trans-
mission).
(3) Raise both wheels of the axle to be tested off
the ground.
(4) Turn ignition to the ON position and dash
switch to the OFF position.
(5) Rotate one tire by hand. The other tire should
spin in the opposite direction.
NOTE: If wheel cannot be rotated the differential
must be repaired/replaced.
LOCKED
(1) Block tires opposite the axle to be tested to pre-
vent the vehicle from rolling.
(2) Place transfer case in 4WD Low and automan-
tic transmission in Park (1st gear if manual trans-
mission).
FRONT AXLE - 216FBI
(3) Raise both wheels of the axle to be tested off
the ground.
(4) Turn ignition to the ON position and dash
switch to the ON position.
(5) Try to rotate one tire by hand. You should not
be able to rotate the tire.
NOTE: If wheel does rotate verify locker pump oper-
ation. If the pump is operating properly the differen-
tial must be repaired/replaced.
LOCKER INDICATOR SWITCH
(1) Turn ignition switch off.
(2) Disconnect locker indicator switch harness
(Fig. 27) from the differential housing.
Fig. 27 INDICATOR SWITCH CONNECTOR
1 - CONNECTOR
2 - DIFFERENTIAL COVER
(3) Measure electrical continuity across the switch
terminals. Circuit should be closed (zero resistance).
NOTE: If circuit is not closed remove differential
and replace locker indicator switch.
LOCKER PUMPS
(1) Connect a pressure gauge to the front pump.
(2) Place transfer case in 4WD Low and automatic
transmission in Park (1st gear if manual transmis-
sion).
(3) Turn ignition to the ON position and push the
dash switch twice to activate the front pump.
NOTE: If pump is not running, verify pump has (Fig.
28) 12 volts and a ground.
(4) With the pump running the pressure gauge
should show 5 psi..
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