Komatsu PC300LC-8 Operation & Maintenance Manual page 360

ATTACHMENTS AND OPTIONS
Hydraulic Circuit Connection
When connecting the attachment, connect the hydraulic circuit as
follows.
1. Remove blind plug (1) at the end of the stop valve piping.
(Two spots on the left and right)
Be careful not to lose or damage any part that has been
removed.
2. Connect attachment piping (2) provided by the attachment
maker to the part from which the plug was removed Step 1.
For the mouthpiece size and accumulator add-on, the action to
take differs according to the attachment manufacturer, so
please consult your Komatsu distributor.
MACHINE READY FOR ATTACHMENT
6 - 9