Attachment Circuit Is Not Changed; Oil Flow In Attachment Circuit Cannot Be Controlled; Attachment Installation Specification - Komatsu PC210-8 Shop Manual

40 Troubleshooting
H-29 Attachment circuit is not changed

Attachment installation specification

Trouble

• Attachment circuit is not changed.

• When attachment installation specification is employed, service circuit is changed as follows
according to selected working mode.
Related
1) ATT mode: Service circuit is changed to double acting circuit and safety valve is set to low pressure.
information
2) B mode: Service circuit is changed to single acting circuit and safety valve is set to high pressure.
• Safety valve set pressure on only B port side is changed; that on A port side is kept low.
Malfunction of ATT return
1
Possible
selector solenoid valve
causes and
standard value
in normal state
Malfunction of ATT return
2
selector valve
Malfunction of service
3
control valve (safety valve)
H-30 Oil flow in attachment circuit cannot be controlled
Attachment installation specification
Trouble

• Oil flow in attachment circuit cannot be controlled.

• When attachment installation specification is employed, oil flow in service circuit changes according
Related to selected user mode.
information
• Procedure for adjusting oil flow in ATT mode of working mode is different from that in B mode.
For details, see Operation and Maintenance Manual.
Possible
Malfunction of ATT flow
causes and 1
adjustment EPC valve
standard value
Malfunction of service PPC
in normal state
2
valve
PC210, 230, 240-8
Cause Standard value in normal state/Remarks on troubleshooting
a
ATT return selector valve may have malfunction. Check it directly.
Safety valve (B port side) of service control valve may have
malfunction. Check it directly.
Cause Standard value in normal state/Remarks on troubleshooting
ATT flow adjustment EPC valve may have malfunction. Check it
directly.
Service PPC valve may have malfunction. Check it directly.
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Working mode
ATT mode
B mode
UEN00245-02
ATT return selector solenoid
valve output pressure
0 MPa
2
{0 kg/cm }
2.9 MPa
2
{30 kg/cm }
1
1
31