28. MACHINES READY FOR ATTACHMENTS WHEN USING GENERAL ATTACHMENT SUCH AS CRUSHER When the lock pin is set to the free position and the pedal is de- pressed at the front to rear portitions, the attachment is actuated. Precautions when using Check that the stop valve is at the free position. Confirm that the selector valve is set tot the position for general at- tachments such ast the crusher. For details of the oil path, see 28.2 “HYDRAULIC CIRCUIT’’. For other precautions when using the attachment, see the instruction manual provided by the attachment manufacturer. 28.5 LONG TERM STORAGE If the equipment is not to be used for a long period, do as follows.
Set the stop valve to the LOCK position. Install the blind plugs and O-rings to the valves. Set the selector valve to the ”when not use” position. Lock the lock pin to the lock position. If the pedal is operated when there is no breaker or general attachment installed, it will cause overheating and other problems. 28.6 SPECIFICATIONS Hydraulic specifications Max. oil flow when merged: 600 l/min. Relief set pressure of service valve safety valve: 27400 kPa (280 kg/cm 2 , 3980 psi) Cracking pressure of service valve safety valve:
24500 kPa (250 kg/cm 2 , 3560 psi) In addition, valves with a safety valve relief set pressure of 24500 kPa (250 kg/cm 2 , 3560 psi) and safety valve crackingpressure of 20.000 kPa (205 kg/cm 2 , 2920 psi) are also available, so please contact your Komatsu distributor. PC450-ENG 5-12