Komatsu PC88MR-10 Shop Manual page 123

Basic principle
Pump swash plate angle control
The pump swash plate angle (pump discharged volume) is so controlled that LS differential pressure
(dPLS), which is the differential pressure between pump discharged pressure (PP) and control valve
outlet LS pressure (PLS) (actuator load pressure), is kept constant.
[LS differential pressure (dPLS) = Pump discharged pressure (PP) - LS pressure (PLS)]
The pump swash plate shifts toward the maximum angle position when LS differential pressure (dPLS) is
lower than the set pressure of the LS valve (when the actuator load pressure is high).
The pump swash plate shifts toward the minimum angle position when LS differential pressure is higher
than the set pressure (when the actuator load pressure is low).
PC88MR-10
10 Structure and function
CLSS
10-45