Komatsu PC15MRX-1 Operation And Maintenance Manual page 209

ATTACHMENTS AND OPTIONS
WHEN USING GENERAL ATTACHMENT SUCH AS CRUSHER
Depress the bottom of the pedal to operate the breaker.
Precautions when using
Check that the stopper valve is in the FREE position.
Check that the selector valve is in the position for 2-WAY
(for crusher and other general attachment).
For details of other precautions when handling the breaker,
read and use correctly the instruction manual provided by
the breaker manufacturer.
MACHINES READY FOR ATTACHMENTS
6-11