HYDRAULIC SYSTEM Ch 5 page 4 Hydraulic system main function. The hydraulic system has one pump. The steering system, brake system, self leveling suspension, tilting functions and the cooling fan functions are fed by the hydraulic pump (140ccm/rev.), driven by the engine. The emergency steering system is fed by the emergency steering pump (maximum 50 l/min) which is driven by the truck’s motion, either forwards or backwards. The hydraulic system has three primary functions: First primary function : supply the steering power and transmit the drivers steering motion from the steering wheel to the steering cylinders, and safely maintain the steering function if the engine fails.
Second primary function : supply the brake and suspension accumulator with pressure in the accumulator chamber and feed the cooling fan motor which provides sufficient fan speed to maintain the engine operating temperature within given limits. Third primary function : supply power to the tilting cylinders to manage unloading the dumper body. SHOP MANUAL