Flow Rate In Attachment Circuit Cannot Be Adjusted - Komatsu Galeo PC138US-8 Shop Manual

SEN02468-01
H-26 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
26
Cause Standard value in normal state/Remarks on troubleshooting
The attachment flow rate adjustment EPC valve may have a mal-
function. Check it directly.
a
Wiring harness
Disconnect connec-
tor V30 of attachment
flow rate adjustment
EPC valve.
Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Service pedal
connector
In NEUTRAL
Operated
40 Troubleshooting
1
PPC valve output
pressure
0 MPa {0 kg/cm }
2
Above 2.7 MPa
{Above 28 kg/cm }
2
PC138US, USLC-8