28. MACHINES READY FOR ATTACHMENTS 28.4 OPERATION WARNING If the pedal is operated inside the deceleration range, the engine speed will rise suddenly. Be careful. If the operator rests his foot on the attachment pedal while operating the machine, if he carelessly depresses the pedal, the attachment may move suddenly and result in serious trouble. Never place your foot on the pedal except when actu- ally performing pedal operation. The operation of the attachment is as follows. WHEN USING BREAKER When the front portion of the pedal is depressed after the lock pin is set at the free position, the breaker is actuated. select the working mode for breaker (B.O).
Precautions when using Check that the stop valve is at the FREE position. Check that the selector valve is at the position for using the breaker. For details of the oil path, see 28.2 “HYDRAULIC CIRCUIT’’. Consult with the attachment manufacturer as to whether the accumulator is required for the attachment circuit or not. For other precautions when using the breaker, see the instruction manual provided by the breaker manufacturer. When the breaker is used, the hydraulic oil degrades faster than in normal operation. Shorten the maintenance interval of the hydraulic oil and filter element. See 23.2 “MAINTENANCE INTERVAL WHEN USING HYDRAULIC BREAKER’’. PC450-ENG 5-11