Kubota KX080-4 Workshop Manual page 106

KX080-4, WSM
2. When the control valve is slightly open
When the control valve is only slightly open, it
produces a large difference in pressure between the
pump discharge pressure P and the load pressure, so
the spool (5) of the L/S regulator (4) moves to the left and
the discharge pressure P and the control pin (1) are
connected. When this happens, it creates pressure on
the control pin, thus reducing the swash-plate tilt angle
and reducing the discharge flow.
(1) Control pin
(2) Horsepower control spring
(3) Horsepower control valve
3-M10
HYDRAULIC SYSTEM
(4) L/S Regulator
(5) Spool
RY9212148HYM0063US0
KiSC issued 08, 2015 A