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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. |
- Place the direction/speed control in the PARK position.
- Chock the wheels.
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NOTICE When towing the machine, attach tow line to the front tow hooks or rear tow pin only.
- Hook up the towing machine. Refer to Operation and Maintenance Manual, "Towing the Machine" for the guidelines.
- Check the steering on the disabled machine. If the steering needs assistance, use an auxiliary power unit as a separate hydraulic source. Consult your Cat dealer for further information.
Note: Limited steering is provided by the secondary steering system. Refer to Operation and Maintenance Manual, "Operator Controls" for more information on the secondary steering system.
Note: When the engine start switch is moved to the OFF position, solenoid valves will fully deplete the brake oil pressure from the brake accumulators and the steering oil pressure from the steering accumulators.
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Illustration 1 g01582996 Note: This machine is equipped with spring-applied parking brakes. These brakes are released with hydraulic pressure. When the engine is inoperable or when the hydraulics are inoperable, the parking brake will be applied.
- Install a pressure gauge in the pressure tap. The gauge will measure the hydraulic pressure that is needed in order to release the parking brake.
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NOTICE The parking brake must be fully released. Partial brake engagement and brake damage could occur if proper hydraulic pressure is not maintained.
Do not allow the parking brake release pressure to drop below
3445 kPa (500 psi) when the towed machine is moving.Show/hide table
Illustration 2 g03654341 Note: An electric drive pump provides hydraulic pressure in order to disengage the parking brakes. This pump also provides hydraulic pressure to the hoist in order to lower the body when the engine is stopped.
- Move the shift control lever to the N position. Park brake indicator (3) light will turn off to indicate that parking brakes are released.
- Apply the service brake pedal on the disabled machine in order to check the braking. If the brakes are functioning, release the brakes.
- Rotate the steering wheel to each side in order to check the steering.
- Remove the wheel chocks.
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Illustration 3 g03663024 - Remove the padlock on the battery disconnect switch (1). Turn the battery disconnect switch to the ON position, so the accumulators will charge.
- Make sure that the engine start switch is in the ON position.
- Pull the disabled machine with the towing machine.
- During towing, continue to monitor the hydraulic pressure gauge that was installed in Step 5. Do not continue to tow the machine if the hydraulic pressure is below
3445 kPa (500 psi) . As the parking brake release oil pressure decreases, depress the brake release switch. Momentarily hold the brake release switch in order to provide adequate brake oil pressure and prevent the engagement of the parking brake.
