Method For Changing Over And Connecting Hydraulic Circuit Of Machines Ready For Installation Of Attachment - Komatsu PC138US-11 Operation & Maintenance Manual

ATTACHMENTS AND OPTIONS
ACCUMULATOR (FOR LOW PRESSURE)
The accumulator (for low pressure) is installed to protect the oil
cooler when the breaker is used.
For necessity of this accumulator, consult the attachment man-
ufacturer.
ATTACHMENT 2 PROPORTIONAL SWITCH
Proportional control rolling switch.
The 2nd-line attachment proportional switch operates the 2nd
attachment circuit (e.g. clamshell rotation). The 2nd-line attach-
ment proportional switch is a roller proportional control switch.
Rolling the switch up produces rotation in one direction, rolling
down produces rotation in the opposite direction. Slight move-
ment of the roller will give slight movement of the clamshell; full
movement of the roller will give faster movement of the clam-
shell.
METHOD FOR CHANGING OVER AND CONNECTING HYDRAULIC CIR-
CUIT OF MACHINES READY FOR INSTALLATION OF ATTACHMENT
METHOD FOR CONNECTING HYDRAULIC CIRCUIT
When installing the attachment, connect the hydraulic circuit as follows.
1.
Check that the rotor of the stop valve installed to the piping
for the inlet port and the outlet port on the side face of the
arm is at LOCK position (b).
(a) FREE: Hydraulic oil flows (direction of arrow is parallel
to longitudinal direction of arm)
(b) LOCK: Hydraulic oil does not flow (direction of arrow is
at right angle to longitudinal direction of arm)
2.
Remove the plug from the stop valve.
Be careful not to lose or damage the removed parts.
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
WENAM00111
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