Komatsu PC500LC-10R Shop Manual page 267

10 STRUCTURE AND FUNCTION
FUNCTION OF TRAVEL PPC SHUTTLE VALVE OF CONTROL VALVE
• This valve controls the stroke of arm spool with pilot pressure of travel PPC valve to limit the flow to the
cylinder if arm IN is operated when traveling uphill.
• When the arm stroke is restricted, the pilot pressure of the travel PPC valve acts through the internal circuit
of the control valve.
OPERATION OF TRAVEL PPC SHUTTLE VALVE OF CONTROL VALVE
When travel lever is in NEUTRAL
1.
The oil in stroke limit signal chamber (a) flows through orifices (5) and (6) of pistons (3) and (4) in the travel
spring case, and flows through travel PPC valve and then drained.
2.
When the arm is moved IN, spool (1) moves to the left until it touches the end surface of spring case (2)
(st0).
PC500LC-10R
COMPONENT PARTS OF HYDRAULIC SYSTEM
AEP21627
10-173