TORQUE CONVERTER GP 7T5522 - Caterpillar

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Left side view of the rear frame (11) Brake release sequence valve
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Left side view of the rear frame (10) Shuttle valveWhen the brake release system is activated, the recovery bar compresses the piston in brake release cylinder (3) against spring pressure. The hydraulic oil in brake release cylinder (3) is forced from the cylinder and directed through shuttle valve (10) to wheel brakes (4) and (41). 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 in brake release cylinder (3) is returned by spring pressure. The hydraulic oil disengaging the parking brake is now returned to brake release cylinder (3). The parking brake will now be engaged.Brake release sequence valve (11) ensures that the brake release system is disabled when the parking brake is disengaged.Recovery Hook
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.
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 consists of the following components: brake release cylinder (3), brake release sequence valve (11), check valve (6) and shuttle valve (10).
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Rear view of the machine (3) Brake release cylinder (62) Recovery hookThe brake release system is activated by an external force being applied to recovery hook (62). Recovery hook (62) is located at the rear of the machine.
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Left side view of the rear frame (11) Brake release sequence valve
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Left side view of the rear frame (10) Shuttle valveWhen the brake release system is activated, recovery hook (62) compresses the piston in brake release cylinder (3) against spring pressure. The hydraulic oil in brake release cylinder (3) is forced from the cylinder and directed through shuttle valve (10) to the wheel brakes. The oil pressure then disengages the parking brake section of the wheel brakes.When the external force on recovery hook (62) is removed, the brake release system is deactivated and the piston in brake release cylinder (3) is returned by spring pressure. The hydraulic oil disengaging the parking brakes is now returned to brake release cylinder (3). The parking brakes will now be engaged.Brake release sequence valve (11) ensures that