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MACHINE READY FOR ATTACHMENT (DELUXE HCU SYSTEM)
HYDRAULIC CIRCUIT
NOTICE
When a breaker is installed, it is necessary to connect the return circuit directly to the return filter, so
use only B mode. Do not use any other mode.
The standard set pressure of the service valve safety valve depends on the mode selected when the
machine is shipped from the factory.
If B mode is selected: 20.6 MPa (2987.8 PSI)
If A or E mode is selected: 27.4 MPa (3974 PSI)
Adjustment may be needed depending on the attachment, so in such a case, please contact your
Komatsu distributor.
Switching Hydraulic Circuit
Depending on the type of attachment, set the working mode on the monitor as follows.
The set pressure of the service valve safety 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 ( 6-18 )".
Switching Between Breaker and General Attachment
When a possible attachment (if equipped) is installed and B mode is selected:
1) The circuit becomes a circuit for breaker operation (1-way circuit).
2) The hydraulic oil flowing in the breaker circuit flows to the additional filter for the breaker.
3) The relief valve is set to a lower pressure.
When shipped from factory: 20.6 MPa (2987.8 PSI)
4) It is possible to adjust the maximum flow with the select mode.
When a possible attachment (if equipped) is installed and A mode or E mode is selected:
1) The circuit becomes a circuit for crusher operation (2-way circuit).
2) The hydraulic oil flowing in the crusher circuit does not flow to the additional filter for the breaker.
3) The relief valve is set to a higher pressure.
When shipped from factory: 27.4 MPa (3974 PSI)
4) It is possible to adjust the maximum flow with the select mode.
6-8
Working mode
Return circuit automatically
B mode
switched so that it does not
pass through control valve
A mode
Return circuit automatically
or
switched so that it passes
E mode
through control valve
ATTACHMENTS AND OPTIONS
Hydraulic circuit
Set pressure of service
safety valve
When shipped from factory :
20.6 MPa
(2987.8 PSI)
When shipped from factory :
27.4 MPa
(3974 PSI)
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