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DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM
Control piston Piston block loading spring
Control spring Piston block
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Drive set Back plate
Pump housing Compensator assembly
Swash plate 1 Control piston rod
Piston RCPH07CCH037F 2 Pressure compensator
Signal line pressure High pressure compensator spool Pump case drain High pressure spring
Control piston pressure Compensator assembly
Piston pump outlet pressure Flow compensator springs
Flow compensator spool Orifice plug
Low pressure stand
When there demand for flow , there pressure signal feedback the and the pump enters low pressure standby mode. Since there place for pump oil flow , pressure builds the pump outlet passage. This pressure through internal passages the pump back the end the compensator spool opposite the
The spring acting the flow compensator spool allows the spool move a 23.527.0 bar ( 340 - 390 psi ) dif ential At this the flow compensator spool moves down and allows oil flow into the passage the pump control
Pressure this control piston tilts the pump swash plate against the swash plate control spring a near neutral this the pump provides just enough flow make for internal thus maintaining a minimum system pressure 23.527.0 bar ( 340 - 390 psi ) .
The pump remains the low pressure standby position long there pressure flow demand from the hydraulic system. this mode, the pump produces very little heat and absorbs very little horsepower from the engine.
Engine Start
Before the engine started, the pump swash plate angle its maximum angle. soon the engine cranked the starter motor , the pressure and flow compensating (PFC) pump produces flow and pressure builds the pump
84318454 14/03/2010
