Method For Change-Over And Connect Hydraulic Circuit For Machine Ready For Installation Of Attachment - Komatsu PC290LC-11 Operation & Maintenance Manual

HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
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.
REMARK
If installing 2nd attachment as a field kit, ask the distributor to
change monitor setting to allow 2 attachment mode.
BREAKER MODE SWITCH
When operating breaker using breaker switch, lock the pedal with the lock pin to avoid accidental oper-
ation.
The breaker mode switch operates the breaker.
Press the breaker mode switch to operate breaker and release
to stop.
METHOD FOR CHANGE-OVER AND CONNECT HYDRAULIC CIRCUIT FOR
MACHINE READY FOR INSTALLATION OF ATTACHMENT
NOTICE
• The return circuit when a breaker is installed must return directly to the return filter, so do not use it
in the mode other than B mode.
• The standard set pressure of the safety valve of the service valve is 20.6 MPa {210 kg/cm
select B mode set at the shipment from the plant and it becomes 27.4 MPa {280 kg/cm
or ATT/E mode is selected. Depending on the attachment, it may be necessary to adjust the pres-
sure. Ask your Komatsu distributor for the adjustment.
SWITCHING THE HYDRAULIC CIRCUIT
• Depending on the type of attachment, set the working mode on the monitor as follows.
• The hydraulic circuit and the set pressure of the safety valve in the service valve switch according to the
working mode selected.
Attachment
Breaker or attachment with
one-way circuit
6-18
k k
WARNING
Working mode
Return circuit automatically
B mode
does not pass through con-
ATTACHMENTS AND OPTIONS
Hydraulic circuit
becomes the circuit that
trol valve
2
} if you
2
} when ATT/P
Set pressure of safety valve
of service valve
When shipped from factory:
20.6 MPa {210 kg/cm
2
}