Description
CONTENTS:
INTRODUCTION
HYDRAULIC – PNEUMATIC – ELECTRICAL – ELECTRONIC SYSTEMS
ENGINE AND PTO IN
TRANSMISSION, DRIVE AND PTO OUT
AXLES, BRAKES AND STEERING
FRAME AND CAB
FRAME POSITIONING
HITCH AND WORKING TOOL
The hydraulic system is protected by limiting its maximum pressure to 20500 – 21500 kPa (2975 – 3120 psi) through the high pressure compensator pressure setting.
When system pressure reaches the setting of the high pressure compensator spool, the pump high pressure compensator spool shifts against its spring, allowing the full pump pressure to be applied to the pump control piston. This destrokes the pump very rapidly from full stroke to almost zero (within 8 to 10 milliseconds). The swash plate stabilizes to provide just sufficient flow to make up for internal leakage.
The pump remains in the high pressure standby mode until the valve in operation returns to neutral. When this occurs, signal line feed from the valve is cut off. Signal pressure drops because the drain orifice plug passage is open to the pump case drain. When there is no signal line pressure, the pump immediately returns to a low pressure standby condition.
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