Komatsu Galeo PC800-8 Shop Manual page 277

10 Structure, function and maintenance standard
• The boom raise operation and swing operation
are matched to each other by changing the sig-
nal for the swing circuit throttle valve and control-
ling the delivery of the front pump and rear pump.
1. Swing throttle valve
Swing priority mode
OFF (normal mode) (De-energized)
Swing priority mode
ON (energized)
ON (swing priority)
2. Front and rear pump flow control
Swing priority mode OFF
(normal mode)
Swing priority mode ON
(swing priority)
*Q : Delivery of front pump, QR: Delivery of rear pump
F
PC800, 850-8
Swing throttle
Solenoid
valve
OFF
ON
OFF
Front and rear pump flow
*Q < Q
F R
Q = Q
F R
In compound operation of swing and boom raise, more oil flows
to boom raise side to secure boom raise speed.
In compound operation of swing and boom raise, more oil flows
to swing side to increase swing speed.
SEN00386-03
Effect
35