FUNCTION FUNCTION 2) 1 2 3 4 5 6 LS pressure 12 13 X 11 8 9 10 L B 7 X L1 S 13 12 4 10 75796WE33 1 Drive shaft 2 Swash plate 3 Shoe plate 4 Counter piston 5 Piston 6 Counter spring 7 Pressure & flow compensator valve 8 Piston shoe 9 Cylinder 10 Control piston 11 Control plate 12 Pressure compensator spool 13 Flow compensator spool The steering pump and loader pump are variable displacement piston pump. The steering pump and loader pump are flow controlled by LS signal. When the steering and loader are not being used, the pumps are at low pressure standby. The load sensing pressure that is sensed from steering and loader hydraulic systems flows to flow compensator spool (13).
This spool keeps the pump output at a level that is necessary to fulfill the requirements for the system flow and for the pressure. The pressure compensator spool (12) also limits maximum system pressure. The pressure compensator spool (12) prevents damage to the steering and loader hydraulic components from excessive pressure. The swivel angle of the pumps is controlled by counter piston (4) and control piston (10). Counter spring (6) cause swash plate (2) to move at maximum displacement or causes swash plate (2) to upstroke. Control piston (10) has a larger area (diameter) than counter piston (4). Control piston (10) causes swash plate (2) to destroke the pump.
Flow compensator spool (13) and/or pressure compensator spool (12) changes pump output by regulating the pump discharge pressure that is acting on control piston (10). 6-12