Rear Differential Dual Pump System Function Test

Rear Differential Dual Pump System Function Test (KX Models 4WD)

Test

1. Decelerating In Forward Gears (2WD mode)





1. Block the front wheels (A), raise the left rear wheel, and support it with a safety stand (B) as shown.

2. Release the parking brake.





3. Hold the left rear tire, and turn it counterclockwise continuously for more than one rotation.

* If the rotation resistants of the wheel remains constant while rotating, the 2WD system when decelerating in a forward gear is normal.
* If the rotation resistants of the wheel increases while rotating, there is a problem in the system. Check the differential fluid. If the fluid is normal, replace the torque control differential (TCD) case kit.

2. Decelerating In Reverse Gears (4WD mode)





1. Block the front wheels (A), raise the left rear wheel, and support it with a safety stand (B) as shown.

2. Relase the parking brake.





3. Hold the left rear tire, and turn it clockwise continuously for more than one rotation.

* If the wheel does not rotate, the 4WD system when decelerating in reverse gear is normal.
* If the wheel rotates, there is a problem in the system. Check the differential fluid. If the fluid is normal, replace the torque control differential (TCD) case kit.

3. Starting And Accelerating In Forward Gears (4WD mode)





NOTE: Do not test repeatedly, or the differential fluid will overheat.

1. Make a mark (A) on either No. 1 or No. 2 propeller shaft (B).

2. Start the engine, and let it idle until the radiator fan comes on at least twice.

3. With the engine at idle, shift to D.

4. Firmly apply the parking brake to lock the rear wheels, and watch the rotation of the propeller shaft.

* If it takes more than 10 seconds to rotate one time, the 4WD system is normal.
* If it takes less than 10 seconds to rotate one time, there is a problem in the 4WD system. Check the differential fluid first. If the differential fluid is normal, replace the torque control differential (TCD) case kit (front pump portion).

4. Starting And Accelerating In R (4WD mode)





NOTE: Do not test repeatedly, or the differential fluid will overheat.

1. Make a mark (A) on either No. 1 or No. 2 propeller shaft (B).

2. Start the engine, and let it idle until the radiator fan comes on at least twice.

3. With the engine at idle, shift to R.

4. Firmly apply the parking brake to lock the rear wheels, and record the time it takes the propeller shaft to rotate 10 times.

* If the recorded time is more than 10 seconds, the 4WD system is normal.
* If the recorded time is less than 10 seconds, there is a problem in the 4WD system. Check the differential fluid first. If the differential fluid is normal, replace the torque control differential (TCD) case kit.