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STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
SET PRESSURES VARYING MECHANISM
1. When starting travel (high-pressure setting)
•
When the travel lever is operated, the pressu-
rized oil from the pump actuates counterbalance
valve spool (14), and opens the pilot circuit to the
safety valve. The oil passes from chamber G to
passage H and flows into chamber J, pushes the
piston to the right, and compresses the spring to
make the set load larger.
•
Because of this, the set pressure of the safety
valve is switched to the high pressure setting,
and a large drawbar pull is made available.
2. When stopping travel (low-pressure setting)
•
When the travel lever is placed at neutral, the
pressure in chamber PA drops and counterbal-
ance valve spool (14) returns to the neutral posi-
tion.
•
While the counterbalance valve spool is return-
ing to the neutral position, the pressurized oil in
chamber J passes through passage H, and es-
capes to chamber PA from chamber G. The pis-
ton moves to the left, and the set load becomes
smaller.
•
Because of this, the set pressure of the safety
valve is switched to the low-pressure setting and
relieves the shock when reducing speed.
Set pressure of safety valve
High-pressure setting
(at starting and traveling)
Low-pressure setting
(at stopping)
PC600, 600LC-7
: 37.8 MPa{385 kg/cm
}
2
: 27.5 MPa{280 kg/cm
}
2
TRAVEL MOTOR
10-103
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