STRUCTURE, FUNCTION, & MAINTENANCE STANDARD HYDRAULIC PUMP 12 SDP08889 ➁ Action of spring The spring load of springs (4) and (6) in the PC valve is determined by the swash plate position. If piston (9) moves to the left, spring (6) is com- pressed, and if it moves further to the left, spring (6) contacts seat (5) and is fixed in position. In other words, the spring load is changed by piston (9) extending or compressing springs (4) and (6). If the command circuit input to PC-EPC valve sole- noid (1) changes further, the force pushing piston (2) changes, and the spring load of springs (4) and (6) also changes according to the valve of the PC-EPC valve solenoid command current.
10-42 PC210/240-7K