b. When load on main pump is heavyIn the same way as in the previous item, when the TVC prolix switch is ON, the com- mand current X sent to solenoid (1) becomes constant. For this reason, the force of sole- noid push pin (11) pushing piston (2) is con- stantlf main pump pressures Pa1 and Pa2 ỉn- crease, piston (2) moves íurther to the left than when the main pump load is light, and is balanced at a position tovvards the left.In this case, the pressure from port b flows to port c, so servo piston (9) moves to the left (to make the discharge amount smaller) by the same mechanism as explained in Item 2.1 )-b, and stops at a position further to the left than when the load on the pump is light. In other words, even when the TVC prolix svvitch is ON, the curve for the pump pres-
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