- Load Haul Dump:
- R2900G (S/N: JLK865-UP)
The hydraulic schematic for the brake release system has incorrect information. Replace the information with the following information.
Brake Release System
S/N: JLK865-UP
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| Illustration 1 | g01507754 |
Hydraulic schematic for the braking system (1) Brake release cylinder (2) Pressure tap for the brake release system (3) Brake release sequence valve (4) Connection for the brake release system (5) Parking brake control valve (6) Shuttle valve (7) Shuttle valve (8) Front wheel brakes (9) Parking brake oil pressure switch (10) Pressure tap for the park brake circuit (11) Line to pilot circuit (12) Brake accumulator oil pressure switch - alert indicator (13) Brake accumulator oil pressure switch - brake application (14) Brake accumulator (15) Service brake and transmission neutralizer pedal (16) Service brake pedal (17) Check valve (18) Check valve (19) Residual brake oil pressure switch (20) Service brake oil pressure switch (21) Brake accumulator relief valve (22) Portable hydraulic pump quick connect coupler (23) Pressure tap for the brake accumulator circuit (24) Service brake control valve (25) Brake accumulator charging valve (26) Pilot relief valve (27) Pressure tap for pilot system (28) Pilot oil filter (29) Check valve (30) Portable hydraulic pump quick connect coupler (31) Pilot and braking pump (32) Hydraulic tank (33) Breaker relief valve (34) Rear wheel brakes | |
Recovery Bar
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If the disabled machine is in a stope or dangerous area, the recovery machine must be operated by remote control. The brake release system must only be activated by a recovery bar securely attached to the recovery machine. The recovery bar must be securely attached to the hitch of the disabled machine prior to activating the brake release system. Failure to securely attach the recovery bar may result in the disabled machine moving. Uncontrolled movement of the disabled machine can cause serious personal injury or death. When the disabled machine has been towed to a safe place, ensure that the machine is parked on level ground and the wheels are blocked securely. Be sure that the machine can not move before performing any service work on the machine. Ensure that the disabled machine cannot move before disconnecting the recovery bar. |
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If the parking brake is engaged due to a machine fault and the machine must be towed, the brake release system can be used to release the machine brakes.
The brake release system is activated by a recovery bar compressing the piston in the brake release cylinder. The brake release cylinder is located in the machine towing hitch at the rear of the machine.
The brake release system consists of the following components: brake release cylinder (1), shuttle valve (6), shuttle valve (7), brake release sequence valve (3) and check valve (18).
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| Illustration 2 | g01035032 |
(1) Brake release cylinder (Typical example) | |
Brake release cylinder (1) is located on the rear of the machine.
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| Illustration 3 | g01032557 |
(3) Brake release sequence valve | |
Brake release sequence valve (3) is located on the left side of the rear frame.
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| Illustration 4 | g01032556 |
(6) Shuttle valve (7) Shuttle valve | |
Shuttle valve (6) and shuttle valve (7) are located on the left side of the rear frame.
When the brake release system is activated, the recovery bar compresses the piston rod in brake release cylinder (1) against spring pressure. The hydraulic oil in the brake release cylinder is forced from the cylinder and directed through shuttle valve (6) and (7) to the wheel brakes. The oil pressure then disengages the parking brake section of the wheel brakes.
When the recovery bar is removed, the brake release system is deactivated and the piston rod in brake release cylinder (1) is returned by spring pressure. The hydraulic oil disengaging the parking brake is now returned to brake release cylinder (1). The parking brake will now be engaged.
Recovery Hook
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If the disabled machine is in a stope or dangerous area, the recovery machine must be operated by remote control. The brake release system must only be activated by a tow line securely attached to the recovery machine. The tow line must be securely attached to the recovery hook of the disabled machine prior to activating the brake release system. Failure to securely attach the tow line may result in the disabled machine moving. Uncontrolled movement of the disabled machine can cause serious personal injury or death. When the disabled machine has been towed to a safe place, ensure that the machine is parked on level ground and the wheels are blocked securely. Be sure that the machine can not move before performing any service work on the machine. |
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If the parking brake is engaged due to a machine fault and the machine must be towed, the brake release system can be used to release the machine parking brake.
The brake release system is activated by an external force being applied to the recovery hook. The recovery hook is located at the rear of the machine.
The brake release system consists of the following components: brake release cylinder (1), shuttle valve (6), shuttle valve (7), brake release sequence valve (3) and check valve (18).
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| Illustration 5 | g01513713 |
Rear view of the machine (typical example) (1) Brake release cylinder (35) Recovery hook | |
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| Illustration 6 | g01032557 |
Left side view of the rear frame (3) Brake release sequence valve | |
Brake release sequence valve (3) is located on the left side of the rear frame.
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| Illustration 7 | g01032556 |
(6) Shuttle valve (7) Shuttle valve | |
Shuttle valve (6) and shuttle valve (7) are located on the left side of the rear frame.
When the brake release system is activated, recovery hook (35) compresses the piston rod in brake release cylinder (1) against spring pressure. The hydraulic oil in the brake release cylinder is forced from the cylinder and directed through shuttle valves (6) and (7) to the wheel brakes. The pressure oil then disengages the parking brake section of the wheel brakes.
When the external force on recovery hook (35) is removed the brake release system is deactivated, and the piston rod in brake release cylinder (1) is returned by spring pressure. The hydraulic oil disengaging the parking brakes is now returned to brake release cylinder (1). The parking brakes will now be engaged.