Komatsu PC600LC-7 Manual page 107

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
Function
• The travel shuttle valve is installed to the top of
the 4-spool valve control valve. It brings the PPC
valve pressures from the L.H. travel, work equip-
ment, and swing. It also sends pilot pressure to
the straight-travel valve when the travel and work
equipment or travel and swing are operated at
the same time.
1) When control valve is at neutral
Operation
• When the travel FORWARD is operated, pilot
pressure oil flows from the L.H. travel circuit to
port P1 and pushes the spool to the right. Ports
P3, P4, and P5 are interconnected with port P0
through the groove in the spool to the straight-
travel valve.
• However, when the work equipment and swing
control levers are at HOLD, the pilot pressure oil
from the PPC valve does not flow, so it also does
not flow to the straight-travel valve.
PC600, 600LC-7
• When the travel reverse is operated, the pres-
sure oil is sent to port P2 and pushes the spool
to the right.
CONTROL VALVE
10-75