Komatsu PC15MRX-1 Operation And Maintenance Manual page 111

Hydraulic excavator
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OPERATION
REMARK
When installing the bucket, the O-rings are easily damaged, so
fit the O-rings on the boss of the arm end as shown in the dia-
gram. When knocking in the pins, move the O-ring down to the
regular groove.
4.
Install the stopper bolts and nuts for each pin, then
grease the pin.
MACHINE OPERATIONS AND CONTROLS
3-57

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