Kubota KX080-4 Workshop Manual page 105

KX080-4, WSM
1. When the control valve is open wide
If the control valve is opened wide (9) in order to
quickly actuates the actuator, the pressure differential
between the pump discharge pressure P and the load
pressure drops temporarily, moving the spool (7) of the
L/S regulator (6) to the right; this connects the control pin
(1) to the horsepower control valve (3). When this
happens, the horsepower control spool (4) moves to the
left, connecting the the control pin (1) to the tank, thus
increasing the swash-plate tilt angle and increasing
discharge flow. This equalizes the differential pressure
and moves the L/S regulator spool back to the left.
(1) Control pin
(2) Horsepower control spring
(3) Horsepower control valve
(4) Horsepower control spool
(5) Reaction pin
3-M9
HYDRAULIC SYSTEM
(6) L/S Regulator
(7) Spool
(8) Compensator spool
(9) Opening area
RY9212148HYM0062US0
KiSC issued 08, 2015 A