Komatsu WA380-8, Operation & Maintenance Manual, Page: 412 / 432

4.
Check that the lock pins have been removed. The lock pin
indicators (3) may not be visible.
5.
Lower the attachment completely to the ground and set it
in a stable position.
6.
Tilt the coupler forward slowly and lower it slowly so that it
separates from the attachment hook.
7.
Release the quick coupler attachment after checking that
the coupler is released from attachment hook. Put your
hand off the quick coupler switch. The switch returns to its
original position, the pilot lamp (1) for releasing quick cou-
pler goes out, and the alarm buzzer stops sounding.
8.
Drive the machine slowly in reverse and separate the at-
tachment from the machine.
TO INSTALL ATTACHMENT
1.
Set the coupler tilted forward posture on a level ground,
stop the machine at the position just before attachment
hook and the coupler tube come to the same line. Depress
the brake pedal to stop the machine with directional lever
at forward.
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HANDLE QUICK COUPLER ATTACHMENTS AND OPTIONS
6-12