10-61
WB97S-5
STRUCTURE AND FUNCTION
CLSS
3.3 INTRODUCTION OF THE LS PRESSURE
Function
•
LS
pressure is the actuator's pressure at control valve output.
•
This pressure actually reduces the pump's
PP
pressure – via the pressure compensation group reducing valve (3)
– to the same
A
pressure of the actuator circuit and then sends it into the
PLS
circuit of the
LS
.
•
In the outriggers control valve, the actuator's pressure
A
is introduced directly into circuit
PLS
of the
LS
3.3.1 Control valve (working equipment not including outriggers).
RKZ09220
PLS
PP
A
b
1
2
3
4
PLSS
c
PA
SA
SLS
a
Functioning
•
When the spool (1) is operated, pump pressure
PP
starts flowing into the circuit of actuator
A
– from the
delivery control valve (2) and from the notch
a
via the
duct
b
.
•
At the same time, the pressure reducing valve (3)
moves to the right thereby making the pump's
pressure
PP
drop as it flows through the bottleneck
c
,
and causing the pressure to flow into the circuit
PLS
of
the
LS
and into the chamber of spring
PLSS
.
•
At this point, the
PLS
circuit of the
LS
is connected to
the tank circuit
T
by means of the by-pass plug (4).
(See the description of the
LS
by-pass plug).
•
The pressure acting on the left side of the reducing
valve (3) is pressure
PA
(=
A
) of the actuator, whereas
the pressure acting on the right hand side is the
reduced pressure
PP
of pump delivery.
•
The reducing valve (3) therefore balances out when
pressure
PA
of the actuators and pressure
PLSS
of
the spring chamber are balanced. This in turn allows
the pressure
PP
– now reduced by the bottleneck
c
–
to be introduced into the
PLS
circuit of the
LS
at the
same pressure
A
as the actuator's circuit.
Summary of Contents for WB97S-5
Page 1: ...WEBM007500 WB97S 5 BACKHOE LOADER SERIAL NUMBER F00003 and up WB97S 5 SHOP MANUAL ...
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Page 161: ...TESTING AND ADJUSTMENTS WB97S 5 20 17 NORMAL OR STANDARD TECHNICAL DATA Fig S RKZ10830 ...
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Page 581: ...40 15 WB97S 5 STANDARD MAINTENANCE CONTROL VALVE RKZ09071 C C B B A A AE AE X View X ...
Page 589: ...40 23 WB97S 5 STANDARD MAINTENANCE CONTROL VALVE ViewX RKZ09591 C C B B A A AE AE ...
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Page 611: ...90 1 WB97S 5 90 OTHER ELECTRICAL DIAGRAM STANDARD VERSION 3 ...
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Page 616: ... 2006 KOMATSU UTILITY EUROPE S p A All Rights Reserved Printed in Europe 06 2006 ...