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Personal injury or death could result when towing a disabled machine incorrectly. Block the machine to prevent movement before releasing the brakes. The machine can roll free if it is not blocked. |
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| Illustration 1 | g00295683 |
Note: This can be seen on machines that are equipped with the Electronic Monitoring System (EMS).
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| Illustration 2 | g00284659 |
Note: This can be seen on machines that are equipped with the Vital Information Management System (VIMS).
- When possible, engage the parking brake.
- Remove the drain plugs for the final drives. Drain the oil into a suitable container.
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. 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 in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 3 | g00295727 |
- Remove the covers from each of the rear wheels.
- Remove the axle shafts. Refer to Disassembly and Assembly, SENR5691, "Power Train" for the procedure.
- Remove any damaged final drive components that may rotate when the machine is towed.
- Attach a 8T-0857 Pressure Gauge and a line in the pressure tap at one of the junction blocks. The junction blocks are located in the parking brake release lines.
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| Illustration 4 | g00290093 |
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| Illustration 5 | g00297279 |
- Hook up the towing machine. Refer to Operation and Maintenance Manual, "Towing the Machine" for the guidelines.
| NOTICE |
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When towing the machine, attach tow line to the front tow hooks or rear tow pin only. |
- If the steering needs assistance, use a 1U-5000 Auxiliary Power Unit . Refer to Special Instructions, SEHS8715, "Using 1U-5000 Auxiliary Power Unit (APU)" for instructions.
- Move the parking brake switch to the OFF position. Turn the engine start switch to the ON position. Open the guard and move the brake retract switch to the ON position. Hold the brake retract switch until the pressure that is shown on the pressure gauge stops rising.
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| Illustration 6 | g00295729 |
Parking Brake Switch | |
Note: This can be seen on machines that are equipped with the Electronic Monitoring System (EMS).
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| Illustration 7 | g00284659 |
Parking Brake Switch | |
Note: This can be seen on machines that are equipped with the Vital Information Management System (VIMS).
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| Illustration 8 | g00295728 |
Brake Retract Switch | |
Note: This can be seen on machines that are equipped with the Electronic Monitoring System (EMS).
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| Illustration 9 | g00283715 |
Brake Retract Switch | |
Note: This can be seen on machines that are equipped with the Vital Information Management System (VIMS).
- Apply the service brake on the disabled machine in order to check the braking. If the brakes are functioning, release the brakes. Pull the disabled machine with the towing machine. Watch the pressure gauge that was installed in Step 6. Do not continue to tow the machine if the oil pressure is below 3445 kPa (500 psi) .
| NOTICE |
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Do not allow oil pressure to drop below 3445 kPa (500 psi) while towing. Partial brake engagement could occur and can result in brake damage. Brakes must be fully released when towed machine is moving. |
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| Illustration 10 | g00295731 |
Note: This can be seen on machines that are equipped with the Electronic Monitoring System (EMS).
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| Illustration 11 | g00290065 |
Note: This can be seen on machines that are equipped with the Vital Information Management System (VIMS).
Note: The air pressure in the air system must be at 550 kPa (80 psi) in order to tow the machine. If there is not sufficient air pressure in the air system, the air system can be charged with air from another source.
| NOTICE |
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Do not exceed the air pressure of 830 ± 35 kPa (120 ± 5 psi) or damage can occur to the air system components. |
- After completing the repairs, install the axle shafts and the covers. Refer to Disassembly and Assembly, SENR5691, "Power Train" for the procedure.
Note: The wheel bearings are not in oil when the final drives are drained. The maximum distance for towing is 30.5 m (100 ft) when the final drives are drained.
Note: If the final drive fails, clean the system before you tow the machine. Debris in the wheel can cause extensive damage to the machine when you tow the machine.
- Fill the final drives. See Operation And Maintenance Manual, "Refill Capacities". Before you operate the machine, check the oil level in the final drives. If necessary, add oil.