Komatsu PC500LC-10R Shop Manual page 359

10 STRUCTURE AND FUNCTION
3.
When this pressure exceeds the set pressure, the force of
"Circular area difference between (D1) and (D3) x Pres-
sure" compresses spring (2).
4.
The pressurized oil moves poppet (1) to the left and flows
into chamber (MB) in the circuit on the opposite side.
Set pressure changing mechanism (when machine starts traveling (high pres-
sure set pressure))
1.
When the travel lever is operated, the pressurized oil from
the pump moves spool (14) to the right.
2.
It opens the pilot circuit to the safety valve and flows into
chamber (J) through chamber (G) and passage (H).
3.
It pushes the piston (3) to the right, compresses the spring
(2), and increases the set load.
4.
The safety valve is set to high pressure, and large traction
force is obtained.
PC500LC-10R
COMPONENT PARTS OF TRAVEL SYSTEM
AEP20524
AEP20525
10-265