Hydraulic Circuit - Komatsu ecot3 Operation And Maintenance Manual

MACHINE READY FOR ATTACHMENT

HYDRAULIC CIRCUIT

NOTICE
The return circuit when a breaker is installed must return directly to the return filter, so do not use it except in B mode.
The standard set pressure for the safety valve in the service valve is set when the machine is shipped from the factory. When
B mode is selected, it is set to 20.6 MPa (210 kg/cm
2
, 3980 PSI). Depending on the attachment, adjustment may be necessary. In such a case, please ask your Komatsu distributor
to carry out the adjustment.
Switching Hydraulic Circuit
Depending on the type of attachment, set the working mode on the monitor as follows.
The set pressure of the safety valve in the service valve and the hydraulic circuit switch is according to the working
mode selected.
Attachment
One-way circuit attachment,
such as breaker
Double-acting circuit
attachment, such as crusher
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 (PAGE 6-19)".
Switching Between Breaker and General Attachment
When optional attachment is installed and working mode is set to B mode
(1) Forms breaker circuit (one-way circuit).
(2) Hydraulic oil flowing through breaker circuit passes through additional filter for breaker.
(3) Relief valve is set to low pressure.
When shipped from factory: 20.6 MPa (210 kg/cm
(4) Maximum oil flow can be adjusted in user mode.
When optional attachment is installed and working mode is set to ATT mode
(1) Forms crusher circuit (double-acting circuit).
(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.
6 - 8
2
, 2980 PSI); when ATT mode is selected, it is set to 27.4 MPa (280 kg/cm
Working
Hydraulic circuit
mode
Automatically forms circuit
B mode where return circuit does not
pass through control valve
Automatically forms circuit
ATT mode where return circuit passes
through control valve
2
2
ATTACHMENTS AND OPTIONS
Set pressure of safety valve in
When shipped from factory:
20.6 MPa (210 kg/cm
When shipped from factory:
27.4 MPa (280 kg/cm
, 2980 PSI)
, 3980 PSI)
service valve
2
, 2980 PSI)
2
, 3980 PSI)