R3000H Load Haul Dump Braking System Caterpillar

Show/hide table

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.

Introduction

This procedure is used to release the parking brakes, and supply oil pressure to the service brakes when pilot oil pressure is not available.

Required Tools

Illustration 1	g02953577
(H) Tooling

Illustration 2	g02956158
(J1) Control Service Tool

Preparation

1. Connect plug (1) of Tooling (H) to the machine's 24 VDC power supply.

   Note: The machine batteries must be charged fully to operate the portable hydraulic pump. If battery charge is low, connect to an external 24 VDC power supply.

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

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

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

5. Move the joystick control lever several times through the full range of travel to release any pressure in the implement pilot circuits.

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

7. Press and hold the breaker relief valve to release any pressure in the hydraulic tank.
   Show/hide table

   Illustration 3	g02953576

8. Remove the caps from coupler (2) and coupler (3). Connect the hydraulic hoses from the portable hydraulic pump to couplers (2) and (3).

9. Connect Tooling (J) to the service tool port.

   Reference: For information on using Tooling (J), refer to the Service Manual, "Caterpillar Monitoring System" for the machine that is being serviced.

Procedure

Show/hide table

Illustration 4	g02953578
Typical example

1. 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".

2. 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.

   Show/hide table

   Illustration 5	g02953579

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

4. 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) during the operation of the portable hydraulic pump.

5. 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 during the towing.

   Show/hide table

   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 Step 6 through Step 8.

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

6. Repeat Step 3 through Step 7.

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

8. Install the caps on the couplers.