Komatsu PC300LC-8 Operation & Maintenance Manual page 365

MACHINE READY FOR ATTACHMENT MACHINE READY FOR ATTACHMENT
6. After checking that the oil has cooled down, turn the rotor on
the stop valve installed to the piping for the inlet port and outlet
port on the side face of the arm to the LOCK position (L).
7. Remove the hoses on the attachment side. Install the plugs to
the two outlets.
The plugs are used to prevent the attachment from incorrect
operation caused by mixing in of foreign matter. After the plugs
are correctly installed, store the attachment.
8. Pull out the mounting pins (2 places), remove the attachment,
then install the bucket.
For details of the procedure for installing the bucket, see
"BUCKET REPLACEMENT
3-169)".
9. After installing the bucket, check the oil level in the hydraulic
tank.
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AND INVERSION (PAGE
ATTACHMENTS AND OPTIONS ATTACHMENTS AND OPTIONS