Flow Rate In Attachment Circuit Cannot Be Adjusted - Komatsu PC130-8 Shop Manual

40 Troubleshooting
H-27 Flow rate in attachment circuit cannot be adjusted
When attachment is installed
Trouble

• Flow rate in attachment circuit cannot be adjusted.

• If an attachment is installed, the flow rate in the service circuit changes according to the selected
Related working mode.
information • How to adjust the flow rate in modes B and ATT is different from that in mode B. For details, see
Operation manual.
Malfunction of attachment
1 flow rate adjustment EPC
valve
Possible causes
and standard
value in normal
state
Malfunction of service PPC
2
valve
PC130-8
Cause
The attachment flow rate adjustment EPC valve may have a mal-
function. Check it directly.
a
Disconnect connec-
tor V30 of attachment
flow rate adjustment
EPC valve.
Standard value in normal state/Remarks on troubleshooting
Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Wiring harness
Service pedal
connector
In NEUTRAL
SEN04124-00
PPC valve output
pressure
0 MPa {0 kg/cm
Above 2.7 MPa
Operated
{Above 28 kg/cm
1
}
2
}
2
27