Komatsu PC15MRX-1 Operation And Maintenance Manual page 206

ATTACHMENTS AND OPTIONS
MACHINES READY FOR ATTACHMENTS
SELECTOR VALVE
This valve (2) selector the flow of the hydraulic oil.
Position (1): When breaker is used
Position (2): When general attachment is used (crusher, etc.)
ATTACHMENT CONTROL PEDAL
This pedal (3) is used to operate the attachment.
REMARK
When depressing the rear of the pedal (mainly when operating
the breaker), put the tip of your foot on plate (1) at the bottom
left of the handrail and depress the pedal with your heel. This
makes it possible to operate the pedal smoothly.
6-8