Komatsu PC200-8M0 Shop Manual page 156

SEN06120-00
Basic principle
Pump swash plate angle control
The pump swash plate angle (pump discharge)
q
is controlled so that LS differential pressure
(dPLS), which is the difference between pump
discharge pressure (PP) and LS pressure
(PLS)) (load pressure of actuator) at control
valve outlet, is constant.
q [LS differential pressure (dPLS) = Pump dis-
charge pressure (PP) - LS pressure (PLS)]
q The pump swash plate angle shifts toward the
maximum position if LS differential pressure
(dPLS) is lower than the set pressure of the LS
valve (when the actuator load pressure is
high).
14
10-402
402 Hydraulic system, Part 2
If it becomes higher than the set pressure
q
(when the actuator load pressure is low), the
pump swash plate angle shifts toward the mini-
mum position.
LS differential pressure (dPLS) and pump
swash plate angle
a See "Main pump" for the explanation of the
operation.
PC200, 200LC, 220, 220LC-8M0
CLSS