Komatsu PC500LC-10R Shop Manual page 360

COMPONENT PARTS OF TRAVEL SYSTEM
Set pressure changing mechanism (when machine stops traveling (low pres-
sure set pressure))
1.
The pressure in chamber (PA) decreases and spool (14)
returns to the neutral position when the travel lever is set
to NEUTRAL position.
2.
The pressurized oil in chamber (J) continues to flow to
chamber (PA) through passage (H) and chamber (G), until
spool (14) returns to the neutral position.
3.
Piston (3) moves to the left and reduces the set load.
4.
The safety valve is set to low pressure, and reduces the
shocks during deceleration.
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10 STRUCTURE AND FUNCTION
PC500LC-10R
AEP20526