Komatsu PC450-8 Operation & Maintenance Manual page 372

MACHINE READY FOR ATTACHMENT
HYDRAULIC CIRCUIT
NOTICE
q
It is necessary to return the return circuit directly to the return filter when a breaker is used, so use
only the B mode. Do not use any other mode.
q
When the machine is shipped from the factory, the standard set pressure of the safety valve in the ser-
vice valve is set as follows:
When B mode is selected: 17.2 MPa (175 kgf/cm
When P or E mode is selected: 20.1 MPa (205 kg/cm
The set pressure may have to be adjusted depending on the attachment. In such cases, please ask
your Komatsu distributor to carry out the adjustment.
Switching Hydraulic Circuit
q
Depending on the type of attachment, set the working mode on the monitor as follows.
q
The set pressure of the safety valve in the service valve and the hydraulic circuit switch is according to the
working mode selected.
Attachment
Breaker or other attachment
with one-way circuit
Crusher or other attachment
with two-way circuit
Adjusting Oil Flow
Depending on the attachment, it is necessary to change the oil flow in the service circuit.
For details of setting the oil flow, see "ATTACHMENT OPERATIONS (6-21)".
Switching Between Breaker and General Attachment
q
If an attachment is installed as an option, and the mode is set to B mode:
(1) The system is set to the breaker operation circuit (1-way circuit).
(2) The hydraulic oil flowing to the breaker circuit flows to the additional filter for the breaker.
(3) The relief pressure valve is set to low pressure.
Set pressure when machine is shipped from factory: 17.2 MPa (175 kgf/cm
(4) It is possible to use the selector mode to adjust the maximum oil flow.
q
If an attachment is installed as an option, and the mode is set to P or E mode:
(1) The system is set to the crusher operation circuit (2-way circuit).
(2) The hydraulic oil flowing to the crusher circuit does not flow to the additional filter for the breaker.
(3) The relief pressure valve is set to high pressure.
Set pressure when machine is shipped from factory: 20.1 MPa (205 kgf/cm
(4) It is possible to use the selector mode to adjust the maximum oil flow.
6-12
Working
Hydraulic circuit
mode
Return circuit automatically
B mode switched so that it does not
pass through control valve
Return circuit automatically
P mode or E
switched so that it passes
mode
through control valve
ATTACHMENTS ANDD OPTIONS
2
)
2
).
Set pressure of safety valve in ser-
2
2
vice valve
When shipped from factory :
17.2 MPa (175 kgf/cm
When shipped from factory :
20.1 MPa (205 kgf/cm
)
)
6
6
2
)
2
)
6
6