Differential Lock: Testing and Inspection

DIAGNOSIS AND TESTING

UNLOCKED
1. Block tires opposite the axle to be tested to prevent the vehicle from rolling.
2. Place transfer case in 4WD Low and automatic transmission in Park (1st gear if manual transmission).
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 prevent the vehicle from rolling.
2. Place transfer case in 4WD Low and automatic transmission in Park (1st gear if manual transmission).
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 operation. If the pump is operating properly the differential must be repaired/replaced.