STRUCTURE AND FUNCTION BRAKING TRAIN Structure and function The brake system is fully hydraulic. Oil is supplied at high pressure by a pump to a priority valve. The priority valve gives priority to the steering circuit. When braking, oil is sent to the brake valve which provides braking pressure to two separate braking circuits (service brakes). In the event of a failure of the power supply, the accumulators provide brake pressure to allow the machine to be safety stopped. A parking brake is provided which is operated by energizing a solenoid valve in the brake valve which sends pressure to the park brake in the transmission. Park brake on solenoid off. 1. Hydraulic oil filter 2.
Hydraulic oil pump (shared with steering system) 3. Priority valve 4. Brake control valve 5. Accumulator - service brake 6. Accumulator - service brake 7. Accumulator - parking brake 8. Pressure switch - stop light 9. Pressure switch - accumulator 10. Pressure switch - parking brake 11. Pressure switch - service brake 12. Brake pedal 13. Swivel joint 14. Service brake cylinder 15. Service brake cylinder 16. Parking brake cylinder 10-21