R2900G Load Haul Dump Caterpillar

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Personal injury or death can result from a brake malfunction. Do not operate the machine if the brake was applied due to a malfunction of the oil system or the brake. Correct any problem before attempting to operate the machine.

Note: Certain Caterpillar machines may be equipped with an optional transmission oil pressure sensor for brake application. The sensor turns on the transmission oil pressure indicator if the transmission oil pressure is low and engages the parking brake if the pressure further decreases (for example, if the engine stalled). If your machine is equipped with the optional transmission oil pressure sensor for brake application, the brake application function needs to be overridden using the 4C-8195 Control Service Tool to enable the brake release function to operate.

Note: Perform Steps 9 through 11 of the following procedure only to machines fitted with the optional transmission oil pressure sensor.

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Illustration 1	g00943687
1DE3048 Portable Hydraulic Pump

1. Connect plug (1) of the 1DE3048 Portable Hydraulic Pump to the machine's 24 volt DC power supply.

   Note: The machine batteries must be fully charged for the operation of the portable hydraulic pump. If battery charge is low, connect to an external 24 volt DC power supply.

2. Depress the service brake pedal at least 80 times to release the oil pressure from the brake hydraulic system.

3. With the operator station door closed, move the joystick control lever several times through the full range of travel to release any pressure in the implement pilot circuits.

4. Move the STIC steering control several times in both directions to release any pressure in the steering hydraulic system.

5. Press and hold the breaker relief valve to release any pressure in the hydraulic tank.

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Illustration 2	g00943686

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Illustration 3	g00943685

6. Remove the caps from quick connect couplers (2) and (3). Connect the hydraulic hoses from the portable hydraulic pump to quick connect couplers (2) and (3) .

7. Turn the battery disconnect switch to the ON position.

8. Turn the engine start switch to the ON position.

9. Connect a 4C-8195 Control Service Tool and a 9EL5720 Service Tool Adapter to the service tool port.

   Reference: For information on using the 4C-8195 Control Service Tool, refer to the Service Manual, "Caterpillar Monitoring System" for the machine that is being serviced.

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Illustration 4	g00946504

10. Use the control service tool to access Mode 6.0 (Transmission Pressure Override) on the Caterpillar Monitoring System display window (7). The default display window reading is "PO-OFF".

11. Operate the clear switch on the control service tool to change the display window reading to "PO-ON".

    Note: Leave the Caterpillar Monitoring System in Mode 6.0 until the procedure has been completed. Changing to another mode will cause the Caterpillar Monitoring System to revert to the default setting and the parking brake will not disengage.

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Illustration 5	g00943691

12. Position switch (8) (from the portable hydraulic pump) inside the operator station.

13. Press and hold switch (8) in the ON position to activate the portable hydraulic pump. Brake accumulator oil pressure indicator (5) will go out when the braking system has full oil pressure.

    Note: Operation of the switch should only take place from inside the operator station. Observe brake indicators and gauges (if equipped) while operating the portable hydraulic pump.

14. When the braking system has full oil pressure, move parking brake control (6) to the OFF position to disengage the parking brake. Hold switch (8) in the ON position until parking brake indicator (4) on the Caterpillar Monitoring System panel goes out. The parking brake is now disengaged.

    Note: The service brakes can be used to stop the machine when the machine has brake oil pressure. Use the service brakes to control the machine when the machine is being towed.

    Note: Using the service brakes will cause the braking system oil pressure to decrease. If brake accumulator oil pressure indicator (5) comes on, operate the portable hydraulic pump to increase the braking system pressure. Ensure that the braking system pressure is maintained for the duration of the towing.

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NOTICE
Operating the portable hydraulic pump for extended periods of time may cause overheating and possible damage of the electric motor. If overheating is observed, stop operating the portable hydraulic pump and allow it time to cool before towing is continued.

Note: For the removal of the portable hydraulic pump from the machine, refer to Steps 15 through 18.

Note: Turning the engine start switch to the OFF position will change the Caterpillar Monitoring System Mode 6.0 to the default setting.

15. Turn the engine start switch to the OFF position.

16. Repeat Steps 2 through 5.

17. Disconnect and remove the portable hydraulic pump from the machine.

18. Install the caps on the quick connect couplers.