143H and 163H Motor Graders All Wheel Drive Caterpillar

This is the procedure for checking the orientation of the cam ring. Improper orientation of the cam ring may cause the all wheel drive piston motors to clack while operating in fourth speed forward through seventh speed forward or third speed reverse through sixth speed reverse.

A cam ring is located in each all wheel drive piston motor. The all wheel drive piston motors are located on each of the front wheels. There is a stamped letter "P" on the cam ring. The stamped letter "P" on the cam ring must be aligned with the bleed hole that is on the housing. This will ensure that the all wheel drive piston motors will turn in the correct direction.System Operation

Reference: Refer to Troubleshooting, "Piston Motor (All Wheel Drive)".

Test Step 1. Perform the following test: Machine Preparation for Troubleshooting

Results:

• OK - Proceed to test step 2.

Test Step 2. Perform the following test: Hydraulic Pressure - Release

Results:

• OK - Proceed to test step 3.

Test Step 3. Cam Ring - Check

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

1. Remove the housing from the all wheel drive piston motor.

2. Identify the location of the stamped letter "P" on the cam ring. The stamped letter "P" on the cam ring must be aligned with the bleed hole on the housing.

Reference: Refer to Troubleshooting, "Wheel Drive".System Operation

Reference: Refer to Troubleshooting, "Piston Motor (All Wheel Drive)".How...

Reference: Refer to Troubleshooting, "All Wheel Drive Motors".

Expected Result:

The stamped letter "P" on the cam ring is aligned with the bleed hole on the housing.

Results:

• No - Proceed to test step 4.

• Yes - Proceed to test step 5.

Test Step 4.

1. Identify the location of the stamped letter "P" on the cam ring. The stamped letter "P" on the cam ring must be aligned with the bleed hole on the housing.

2. Replace any parts that are worn or damaged. Use new Caterpillar parts for replacement.

3. Install the housing to the all wheel drive piston motor.

Reference: Refer to Troubleshooting, "All Wheel Drive Motors".Specifications

Reference: Refer to Troubleshooting, "Wheel Drive".Parts

Reference: Refer to Troubleshooting, "114-6577 HOUSING GP-MOTOR PIN 5AK1-UP. PART OF 104-3636, 104-3637 MOTOR GP-PISTON".

Expected Result:

The all wheel drive piston motor has been correctly assembled.

Results:

• Continue - Proceed to test step 6.

Test Step 5.

1. Clean all parts prior to installation in the all wheel drive piston motor.

2. Install the housing to the all wheel drive piston motor.

Reference: Refer to Troubleshooting, "All Wheel Drive Motors".Specifications

Reference: Refer to Troubleshooting, "Wheel Drive".

Expected Result:

The all wheel drive piston motor has been correctly assembled.

Results:

• Continue - Proceed to test step 7.

Test Step 6.

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NOTICE
This procedure must be completed before operating the all wheel drive system. Failure to do so can result in damage to the front motor pistons due to lack of lubrication.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

1. Fill the all wheel drive piston motor with hydraulic oil.

Reference: Refer to Troubleshooting, "Wheel Drive - Lubricate".

Expected Result:

The all wheel drive piston motor has been filled with hydraulic oil.

Results:

• Repair Complete - Stop.

Test Step 7.

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NOTICE
This procedure must be completed before operating the all wheel drive system. Failure to do so can result in damage to the front motor pistons due to lack of lubrication.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

1. Fill the all wheel drive piston motor with hydraulic oil.

Reference: Refer to Troubleshooting, "Wheel Drive - Lubricate".Specifications

Reference: Refer to Troubleshooting, "Wheel Drive".

Expected Result:

The all wheel drive piston motor has been filled with hydraulic oil.

Results:

• OK - Stop.