Komatsu PC138USLC Operation & Maintenance Manual page 226

OPERATION
Inversion
When reversing a bucket, there is the danger that the bucket tooth tip
overruns the normal trajectory and interferes with the cab, thus causing a
serious trouble. Pay good attention to the work when reversing a bucket so
that the bucket and the cab may not interfere with each other.
1. Place the bucket in contact with a flat surface.
REMARK
When removing the pins, place the bucket so that it is in light
contact with the ground.
If the bucket is lowered strongly to the ground, the resistance will
be increased and it will be difficult to remove the pins.
NOTICE
After removing the pins, make sure that mud or sand does not get on them.
Dust seals are fitted at both ends of the bushings, be careful not to damage
them.
2. Remove the double nut on the stopper bolt for arm pin (A) and
link pin (B), remove the bolt, pull out arm pin (A) and link pin (B),
and then remove the bucket.
3. Turn the removed bucket. After turning the bucket, align the
arm (5) with link (6) mounting hole (1), then align the link (6)
with arm (5) mounting hole (2) and install.
4. Insert grease-coated pins (A) and (B) into hole (1) and hole (2)
respectively.
WARNING
MACHINE OPERATIONS AND CONTROLS
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