Komatsu PC290LC-11 Operation & Maintenance Manual page 445

ATTACHMENTS AND OPTIONS
Crusher or other attach-
ment with two-way circuit
Depending on the attachment, it is necessary to change the oil flow in the service circuit.
For details of setting the oil flow , see "METHOD FOR OPERATING ATTACHMENT (6-25)"
SWITCHING OF BREAKER AND GENERAL ATTACHMENT
• When optional attachment is installed and working mode is set to B mode
1.
Breaker circuit (one-way circuit) is formed.
2.
Hydraulic oil flowing through breaker circuit passes through additional filter for breaker.
3.
Relief valve is set to low pressure.
When shipped from the factory: 20.6 MPa (210kg/cm
4.
Maximum oil flow can be adjusted in user mode.
• If ATT/P or ATT/E mode is turned on when the optional attachment is installed
1.
Crusher circuit (2-way circuit) is formed.
2.
Hydraulic oil flowing through crusher circuit does not pass through additional filter for breaker.
3.
Relief valve is set to high pressure.
When shipped from factory: 27.4 MPa (280 kg/cm
4.
Maximum oil flow can be adjusted in user mode.
METHOD FOR CONNECTING HYDRAULIC CIRCUIT
When installing the attachment, connect the hydraulic circuit as follows.
1.
Check that stop valve (1) is located at LOCK position (b).
(a) FREE: Hydraulic oil flows (direction of arrow is parallel
to longitudinal direction of arm)
(b) LOCK: Hydraulic oil does not flow (direction of arrow is
at right angle to longitudinal direction of arm)
• When setting the FREE or LOCK position of the stop
valve, remove bolt (1) and washer (2) fit lever (3) and
refit bolt (1) and washer (2) rotate valve to furthest po-
sition clockwise or anti-clockwise. After setting remove
lever (3) and refit bolt (1) and washer (2).
2.
Remove plate (4) at the tip of the stop valve piping. (Right
and left, 2 places).
Be careful not to lose or damage the removed parts.
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
ATT/P or ATT/E mode
2
Return circuit automatically
becomes the circuit that
does not pass through con-
trol valve
2
)
)
When shipped from factory:
2
27.4 MPa {280 kg/cm
6-19
}