Breaker or attachment with
one-way circuit
B mode
Return circuit automatically
becomes the circuit that
does not pass through con-
trol valve
When shipped from factory:
20.6 MPa {210 kg/cm
2
}
Crusher or other attach-
ment with two-way circuit
ATT/P or ATT/E mode Return circuit automatically
becomes the circuit that
does not pass through con-
trol valve
When shipped from factory:
27.4 MPa {280 kg/cm
2
}
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 (6-24)”
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
2
)
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
2
)
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.
Remove plug (1) (2 places on right and left sides) at the tip
of the stop valve piping.
Be careful not to lose or damage the removed parts.
2.
Connect the attachment piping (2) provided by the attach-
ment manufacturer to the part from where the plug is re-
moved.
REMARK
Method of connection varies depending on the attachment
manufacturer because size of the fitting, added accumula-
tor, etc. are different. Consult your Komatsu distributor.
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
6-19
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