Komatsu PC350LC-8, Operation & Maintenance Manual

Page: 376 / 502

HYDRAULIC QUICK COUPLER PIPING
ATTACHMENTS AND OPTIONS
6-4
OPERATION 6
To release a bucket or attachment
1. If the bucket or attachment has any hydraulic connections to the machine these must be disconnected before
proceeding.
WARNING
Pressure in the system can cause injury. Follow all instructions in ATTACHMENT REMOVAL AND INSTAL-
LATION.
2. Position the attachment on the ground safely where it is to
be left. Take care that it will not roll or slide after release.
3. Operate switch (1).
NOTE: The switch has a safety lock mechanism to prevent
accidental operation. Slide the lock towards you then
rock the switch. The lamp on the switch will come on
and a warning buzzer will sound.(NB Operation will
only take place if button (2) is also pressed).
4. With switch (1) in position "B" press and hold button (2) on
the left hand lever to activate quick coupler.
5. 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 (Swing Lock Switch (3-77)).
6. The quick coupler will now release the attachment/bucket.
To pick up a new bucket or attachment
1. Position the quick coupler over the new bucket or attachment
2. Operate switch (1).
NOTE: The switch has a safety lock mechanism to prevent accidental 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. With switch (1) in position "B" press and hold button (2) on the left hand lever, to activate quick coupler.
4. 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 pressure in the hydraulic system. If using the swing
function activate the Swing Lock first (Swing Lock Switch (3-77). The quick coupler will move to the 'released'
position.
5. 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.
6. Release button (2). The quick coupler will lock onto the bucket or attachment, if necessary operate one of the
machine control levers to raise the system pressure.
Return switch (1) to position "A" (OFF). The lamp will go off and the buzzer stop.
1
B
A
B
2
A:
When depressed at this point quick coupler deactivated
[NB - LOCK bucket/attachment].
B:
When depressed at this point quick coupler is ready to
be activated [NB - RELEASE bucket/attachment].