STRUCTURE, FUNCTION AND MAINTENANCE STANDARD CLSS
10-38 PC58UU-3
Basic principle
1. Control of pump swash plate angle
• The pump swash plate angle (pump deliv-
ery) is controlled so that the LS differential
pressure ∆PLS, which is the difference
between the pump discharge pressure PP
and the LS pressure PLS (actuator load
pressure) at the control valve outlet,
becomes constant.
(LS differential pressure ∆PLS = Pump
pressure PP - LS pressure PLS)
• When the LS differential pressure ∆PLS
reduces below the set pressure of the LS
valve (when actuator load pressure is
high), the pump swash plate angle will
move in the direction of maximum. When
the set pressure is raised (when the actua-
tor load pressure is low), the pump swash
plate angle will move in the direction of
minimum.
★ For the detail of the operation, see the
paragraph of "Hydraulic Pump".
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