Komatsu PC138USLC Operation & Maintenance Manual page 351

MACHINE READY FOR ATTACHMENT
Selector Valve
This valve (2) selector the flow of the hydraulic oil.
Position (a) : When breaker is used
Position (b) : When general attachment is used (crusher, etc.)
Attachment Control Pedal
This pedal (3) is used to operate the attachment.
Lock Pin
This pin (4) locks the control pedal.
Position (a): Lock
Position (b): Pedal half stroke position (When using an attachment
like the slide arm requiring a small flow rate or a
breaker)
Position (c): Pedal full stroke position (When using an attachment
like the crusher and power ripper requiring a large flow
rate)
Keep the lock pin in the LOCK position when attachment is not
used.
6 - 6
ATTACHMENTS AND OPTIONS