Ch 5 page 7 HYDRAULIC SYSTEM 8. Test Block Located on the left side, over the hydraulic tank, has all the test ports from the hydraulic system. Also, most of the pressuresensors are mounted on the test block, and are responsible to send information to the VCU. 9. Tilt Cylinders The Tilt Cylinders are located on the rear wagon on each side of the dumper body. The specs for them are: HA30 HA45 Double acting Cylinder diameter 115mm 125mm Piston rod 70mm 85mm Stroke 2290mm 2614mm 10. Brake Valve The pedal brake is located on the cab front wall (firewall). Access is obtained by tilting the cab. The pressure setting is 120±5 bar, measured at brake port A.
Pilot flow from brake valve to relay valve, 1:1. 11. Parking Brake Cylinder The parking brake cylinder is spring actuated, hydraulic released, self-centering, single disc brake mounted at the fixed propeller shaft in rear chassis. 12. Emergency Steering Pump The hydraulic system is equipped with a ground driven radial piston pump fitted at the transmission. This pump makes the truck manoeuvrable if the engine stops or main pump drive fall out. 13. Fan Drive Motor The Fan Drive Motor is located at the front end of the engine, just behind the cooler package. Access is obtained by removing the bonnet. 14.
Suspension cylinder The suspension cylinders are located on each side of the front frame, behind the fenders. HA30 HA45 Double acting Cylinder diameter 125mm 125mm Piston rod 100mm 100mm Stroke 200mm 300mm 15. Self leveling accumulator The 4.0 liter self leveling accumulator is placed behind the suspension cylinders on the front frame LHS and RHS. 16. Wheelhub with brake 17. Wheelhub without brake 18. Relay valves VS relay valve provides high flow directly from the accumulators to the brakes, proportional to the control pressure, i.e. directly proportional to the pedal position. The braking is progressive. As soon as brake pedal is released, VS transfers oil from brakes to the tank.
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