Komatsu PC138US-11 Operation & Maintenance Manual page 405

ATTACHMENTS AND OPTIONS
(1) Quick coupler switch
(2) Adjustable pressure regulating valve
TO RELEASE A BUCKET OR ATTACHMENT
Pressure in the system can cause injury. Follow all instructions in ATTACHMENT REMOVAL AND IN-
STALLATION.
If the bucket or attachment has any hydraulic connections to the machine these must be disconnected before
proceeding.
1.
Position the attachment on the ground safely where it is to be left. Take care that it will not roll or slide after
release.
(1) Operation switch
REMARK
The switch has a safety lock mechanism to prevent acci-
dental operation. Slide the lock towards you then rock the
switch. The lamp on the switch will come on and a warning
buzzer will sound.
NOTICE
Operation will only take place if button (2) is also
pressed.
(A) : When depressed at this point quick coupler deactivat-
ed. (Lock bucket/attachment)
(B) : When depressed at this point quick coupler is ready
to be activated. (Release bucket/attachment)
2.
With switch (1) in position "B" press and hold button (2) on
the left hand lever to activate quick coupler.
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.
The quick coupler will now release the attachment/bucket.
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.
(3) Piping (quick coupler lock direction)
(4) Piping (quick coupler release direction)
WARNING
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WARNING
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WENAM00111
QUICK COUPLER SYSTEM
6-5