Komatsu Galeo BR380JG-1E0 Shop Manual page 126

SEN01352-00
Basic principle
1. Pump swash plate angle control
The pump swash plate angle (pump delivery)
q
is controlled so that LS differential pressure
(dPLS) (the difference between pump pressure
PP and control valve outlet port LS pressure
PLS) (load pressure of actuator) is constant.
[LS differential pressure (dPLS) = Pump dis-
q
charge pressure (PP) – LS pressure (PLS)]
16
10 Structure, function and maintenance standard
1
The pump swash plate angle shifts toward the
q
maximum position if LS differential pressure
(dPLS) is lower than the set pressure of the LS
valve (when the actuator load pressure is
high).
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 For details of functions, see the "Hydraulic
pump" paragraph.
BR380JG-1E0