METHOD FOR CHANGING OVER AND CONNECTING HYDRAULIC CIR-
CUIT OF MACHINES READY FOR INST
ALLATION OF ATTACHMENT
METHOD FOR CONNECTING HYDRAULIC CIRCUIT OF MACHINES READY FOR
INSTALLATION OF ATTACHMENT
NOTICE
Since the pressure of attachment hydraulic circuit of this machine is set to 17.2 MPa {175
 kg/cm
2
,
2490 PSI}, check the withstand pressure of installed attachment.
When arranging the piping, take care that the bucket does
not interfere with link (a) even if it is moved to the dump
side fully.
Connect the hydraulic circuit according the following procedures when installing the attachment.
1.
For the machine equipped with attachment control pedal,
set the attachment lock cover to LOCK position (L).
2.
Remove the plug.
Be careful not to lose or damage the removed parts.
3.
Connect the attachment piping provided by the attachment
manufacturer
.
Joint screw size is as follows.
Left side of arm
1/2" G
Right side of arm
3/4" G
4.
Change over the hydraulic circuit corresponding to the attachment installed.
5.
After connecting the piping, bleed air from the hydraulic circuit according to the following procedure.
NOTICE
• If the attachment has its own air bleeding procedure specified by the manufacturer, observe
them.
• If the engine is run at high speed or a cylinder is pushed up to its stroke end immediately after
startup, air taken inside the cylinder may cause damage to the piston packing.
1)
Start the engine.
Run the engine at low idle for 10 minutes after starting, and then start the following work.
2)
Operate the work equipment control lever repeatedly to bleed the air completely from the cylinders.
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
6-9
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