Komatsu PC290LC-11 Operation & Maintenance Manual page 432

QUICK COUPLER SYSTEM
REMARK
When during the operation decrease oil pressure in the quick coupler system a warning buzzer will sound inter-
mittently. Action level L03 and an error message appears on monitor display.
In this case stop the machine immediately and ask your Komatsu distributor for inspection and maintenance.
TO PICK UP A NEW BUCKET OR ATTACHMENT
• Check daily that the hoses and fittings in the quick coupler piping system are in good condition.
Pay particular attention to the hoses and fittings at the arm end as these can be damaged easily. In
case of damage or leakage of oil stop work. Loss of oil could lead to the bucket or attachment fall-
ing and killing an exposed person. The damage or leakage must be repaired before continuing
work.
• This machine has a system installed to give a warning if there is a failure to maintain pressure in
the quick coupler system. If the buzzer sounds in the cab make sure that the cause is clarified be-
fore continuing work. In particular check for leaks in the system. If in doubt call your Komatsu dis-
tributor.
1.
Position the quick coupler over the new bucket or attachment.
2.
Operate switch (1), and with switch (1) in position "B" press
and hold button (2) on the left hand lever, to activate quick
coupler.
NOTICE
The switch has a safety lock mechanism to prevent ac-
cidental operation. Slide the lock towards you then
rock the switch. The lamp on the switch will come on
and a warning buzzer will sound.
3.
Depending on the design of the quick coupler it may be
necessary to operate one of the hydraulic functions of the
machine (bucket, boom, arm or swing) to raise the pres-
sure in the hydraulic system. If using the swing function
activate the Swing Lock first. Refer to "SWING LOCK
SWITCH (3-88)" . The quick coupler will move to released
position.
4.
Position the quick coupler in the mating portion of the
bucket or attachment, moving the bucket cylinder, arm and
boom as necessary.
Follow the quick coupler manufacturer's instructions.
5.
Release button (2).
If the bucket or attachment needs a connection to the hydraulic system of the machine, follow all instruc-
tions in ATTACHMENT REMOVAL AND INSTALLATION.
The quick coupler will lock onto the bucket or attachment, if necessary operate one of the machine control
levers to raise the system pressure.
European safety standards require that it is possible to check the locked position of the quick cou-
pler from the operator's position. Failure to check could cause the death of exposed persons.
Check carefully that all the locking of the quick coupler is complete and secure. Follow the manu-
facturer's instructions carefully, including the installation of any safety device, if required.
6.
Return switch (1) to position "A" (OFF).
The lamp will go off and the buzzer stop.
6-6
k k
WARNING
k k
WARNING
ATTACHMENTS AND OPTIONS
KS000874
KS000875