This is the procedure for checking the Duo-Cone seals. Improper assembly of the Duo-Cone seals may cause the Duo-cone seals to leak. Also, the housing for the all wheel drive piston motor could fail. There is one Duo-cone seal in each of the front wheel assemblies.
It is important to use the correct assembly procedures when the Duo-Cone seals are installed. Many of the failures of the Duo-Cone seals are the result of improper seal assembly. Prior to installation, the Duo-Cone seals must be free of oil, dust or other foreign matter. No particles of any kind are permissible on the sealing surfaces. A small piece of paper towel can cause the seal faces to move apart. This would cause the seal to leak.
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.
- Drain the hydraulic oil from the all wheel drive piston motor into a suitable container.
| 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. |
- Remove the all wheel drive piston motor from the wheel assembly.
Reference: Refer to Troubleshooting, "All Wheel Drive Motors".Diagram...
Reference: Refer to Troubleshooting, "Piston Motor (All Wheel Drive)".
Expected Result:
The all wheel drive piston motor has been removed from the wheel assembly.
Results:
- Continue - Proceed to test step 4.
Test Step 4.
- Remove the wheel assembly from the spindle.
- Inspect the Duo-Cone seals for wear or damage.
Reference: Refer to Troubleshooting, "Front Wheel Spindles".Specifications
Reference: Refer to Troubleshooting, "Wheel Drive".
Expected Result:
The Duo-Cone seals are not worn or damaged.
Results:
- Yes - Proceed to test step 5.
- No - Proceed to test step 6.
Test Step 5.
- Install the wheel assembly to the spindle.
Reference: Refer to Troubleshooting, "Front Wheel Spindles".Specifications
Reference: Refer to Troubleshooting, "Wheel Drive".
Expected Result:
The wheel assembly has been installed to the spindle.
Results:
- Continue - Proceed to test step 7.
Test Step 6.
- Replace the Duo-cone seals. Use new Caterpillar parts for replacement.
- Install the Duo-cone seals to the wheel assembly.
Reference: Refer to Troubleshooting, "Conventional Duo-Cone Seals".Parts
Reference: Refer to Troubleshooting, "104-1803 DRIVE GP-WHEEL-LH PIN 5AK1-UP. PART OF 101-8076, 141-3010 AXLE GP-FRONT".
Expected Result:
The Duo-cone seals are correctly installed.
Results:
- Continue - Proceed to test step 8.
Test Step 7.
- Install the all wheel drive piston motor to the wheel assembly.
Reference: Refer to Troubleshooting, "All Wheel Drive Motors".Specifications
Reference: Refer to Troubleshooting, "Wheel Drive".Diagram...
Reference: Refer to Troubleshooting, "Piston Motor (All Wheel Drive)".
Expected Result:
The all wheel drive piston motor has been installed to the wheel assembly.
Results:
- Continue - Proceed to test step 9.
Test Step 8.
- Install the wheel assembly to the spindle.
Reference: Refer to Troubleshooting, "Front Wheel Spindles".Specifications
Reference: Refer to Troubleshooting, "Wheel Drive".
Expected Result:
The wheel assembly has been installed to the spindle.
Results:
- Continue - Proceed to test step 10.
Test Step 9.
- Fill the all wheel drive piston motor with hydraulic oil.
| 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. |
| 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. |
Reference: Refer to Troubleshooting, "Wheel Drive - Lubricate".
Expected Result:
The all wheel drive piston motor is filled with hydraulic oil.
Results:
- Continue - Continue troubleshooting the all wheel drive system. Stop.
Test Step 10.
- Install the all wheel drive piston motor to the wheel assembly.
Reference: Refer to Troubleshooting, "All Wheel Drive Motors".Specifications
Reference: Refer to Troubleshooting, "Wheel Drive".Diagram...
Reference: Refer to Troubleshooting, "Piston Motor (All Wheel Drive)".
Expected Result:
The all wheel drive piston motor has been installed to the wheel assembly.
Results:
- Continue - Proceed to test step 11.
Test Step 11.
- Fill the all wheel drive piston motor with hydraulic oil.
| 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. |
| 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. |
Reference: Refer to Troubleshooting, "Wheel Drive - Lubricate".
Expected Result:
The all wheel drive piston motor is filled with hydraulic oil.
Results:
- Repair Complete - Stop.