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PUMP AND VALVE CONTROL SYSTEM
Operating conditions of 2-stage relief function
•
When the machine travels
•
When swing lock switch is ON
•
When boom is lowered
•
When one-touch power maximizing function is operated
•
In L mode
Variable back pressure function
Variable back pressure function is a function that changes the set pressure of the back pressure valve according
to the operating state of the machine.
Operating condition
During swinging or travel
During state other than swinging or travel
10-104
10 STRUCTURE AND FUNCTION
Relief pressure
34.8 MPa {355 kg/cm
37.2 MPa {380 kg/cm
Setting of back pressure valve
High-pressure set
Low-pressure set
2
}
↓
2
}
PC500LC-10R
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