28. MACHINES READY FOR ATTACHMENTS 3. ATTACHMENT CONTROL PANEL This is used to operate the attachment. When the operator depresses the pedal at the front, neutral or rear portions, the attachment moves as follows. Hydraulic crusher Hydraulic breaker Pedal front a : actuated Pedal front a : actuated Pedal neutral N : stopped Pedal neutral N : stopped Pedal rear b : reversed Pedal rear b : stopped For other attachments, confirm with the manufacturer regarding the relation between pedal operation and attachment movement when the attachment is mounted. Use the attachment only after confirming the above. 4 LOCK PIN This is used to lock the control pedal.
Screw pin a into hole inside of pedal to lock. Screw pin a out the hole to unlock. When the breaker is used, select the breaker operation mode (B.O.) in the monitor and use the pedal with pin in unlocked position. Unlock Lock 5. ADDITIONAL FILTER FOR BREAKER This filter prevents degradation of the hydraulic oil when the breaker is used. Oil flows only when the selector valve is turned to the breaker position. 6. ACCUMULATOR The accumulator is provided to release the pressure remaining in the attachment circuit after stopping the engine. Normally, never touch it.
PC450-ENG 5-6 WARNING The accumulator is filled with high-pressure nitrogen gas, and it is extremely dangerous if it is handled in the wrong way. For han- dling procedure, see 11.19 ”HANDLING ACCUMULATOR’’. WARNING