10-75
d.
When the system enters “saturation” condition
•
If the engine speed is reduced during the operation of one or more loads, there will be a corresponding reduction in
the flow from the pump. It follows that the pump will compensate for this by altering the swash plate angle.
•
When the pump reaches its maximum displacement, and thus can no longer increase its delivery, the difference
between the pump delivery pressure
PP
and the pressure
PLS
of the
LS
(pressure difference
∆
PR
) will become
smaller (“saturation” condition).
•
The pressure
PLS
present in chamber
a
of the
LS
valve will be nearly equal to the pressure
PP
and the piston (1) will
be moved left by the combined force of the pressure
PLS
and the spring (2).
The piston thus closes the passage
c
and connects the passages
d
and
e
.
•
The pressurised oil in chamber
X
of the control piston (6) flows through the passages
d
and
e
to reach the pump drain
chamber; in this way the pressure in chamber
X
of the control piston (6) becomes equal to the drain pressure.
•
As a result, the control piston (6) is shifted to the right by the movement of the swash plate determined by the spring
(5) up to the maximum swash plate angle.
M
Min
Max
D0004880
8
7
6
5
2
1
PLS
a
b
X
e
d
c
f
T
PP
PP
PEN
HYDRAULIC SYSTEM
LOAD SENSING VALVE, PRESSURE CUT-OFF VALVE
Summary of Contents for AGROTRON 106 MK3
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