QUICK COUPLER SYSTEM
HANDLING QUICK COUPLER
WARNING
Quick coupler operation can be dangerous. There is a risk of death to exposed persons. Follow these
instructions strictly.
• Use only quick couplers which comply with European standard EN474. In particular, it must be possible to
confirm from the operator's position that the locking of the attachment or bucket has been completed.
• Use only quick couplers which include a pilot operated check valve in the locking cylinder. This is to ensure
that there is no risk of the bucket or attachment coming loose in the case of loss of hydraulic pressure. If in
doubt consult the manufacturer of the coupler.
• Read the instruction manual of the quick coupler carefully and follow the recommendations. If in doubt
about the installation or operation consult your Komatsu distributor.
• Pressure regulation valves (5) and (6) allow the attachment pressure and the release pressure for the quick
coupler to be limited according to the coupler manufacturer's recommendation respectively. Maximum cir-
cuit pressure 34.3 MPa (350 kgf/cm
2
)
• Ensure that the quick coupler is installed by a suitably qualified technician. If in doubt contact your Komatsu
dealer.
LOCATIONS
(1) Switch - Quick Coupler
(2) Button - Quick Coupler
(3) Piping (quick coupler lock direction)
(4) Piping (quick coupler release direction)
(5) Adjustable pressure regulating valve (Attach)
(6) Adjustable pressure regulating valve (Release)
OPERATION OF QUICK COUPLER
TO RELEASE A BUCKET OR ATTACHMENT
WARNING
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.
QUICK COUPLER SYSTEM ATTACHMENTS AND OPTIONS
6-4
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