Komatsu Galeo PC138US-8 User Manual

40 Troubleshooting SEN02468-01
PC138US, USLC-8
13
H-9 Work equipment does not move in its single operation 1
Trouble
• Work equipment does not move in its sin-
gle operation
(1) The boom does not move when operated indepen-
dently.
(2) The arm does not move when operated indepen-
dently.
(3) The bucket does not move when operated inde-
pendently.
Related
information
• Set the working mode at P mode for the troubleshooting.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Malfunction of PPC valve
a Stop engine for preparations. Start troubleshooting at engine
high idle.
Work equipment control lever PPC valve output pressure
NEUTRAL 0 MPa {0 kg/cm
2
}
Operation
Above 2.7 MPa
{Above 28 kg/cm
2
}
2
Malfunction of work equip-
ment control valve (spool)
The spool in the work equipment control valve is presumed to mal-
function. Check the valve itself.

Komatsu Galeo PC138US-8 Specifications

General

Brand	Komatsu
Model	Galeo PC138US-8
Category	Excavators
Language	English