Komatsu PC130-8 User Manual

SEN04124-00 40 Troubleshooting
8 PC130-8
H-3 No work equipment, travel and swing move 1
H-4 Abnormal noise is heard from around hydraulic pump 1
Trouble • No work equipment, travel and swing move.
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 lock
solenoid valve
a Stop engine for preparations. Start troubleshooting at engine
high idle.
Work equipment lock lever Solenoid output pressure
Locked
0 MPa
{0 kg/cm
2
}
Released
2.84 – 3.43 MPa
{29 – 35 kg/cm
2
}
2
Malfunction of self reducing
pressure valve
a Stop engine for preparations. Start troubleshooting at engine
high idle.
Control lever Control circuit source pressure
All control levers in
NEUTRAL position
3.2 ± 0.5 MPa
{33 ± 5 kg/cm
2
}
3 Piston pump defective
The piston pump is suspected of malfunction or an internal failure.
Diagnose it in the following manner.
• Remove the main oil pressure measurement plug and crank the
engine. If oil flows out, it is in normal condition.
4 Damper defective
It is presumed that the pump shaft does not rotate due to some
internal failure of the dumper. Check the damper itself.
Trouble • An abnormal noise is heard from around the hydraulic pump.
Related
information
—
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Hydraulic oil level lowered Make a visual check.
2 Quality of hydraulic oil bad Air may have get mixed with the oil. Make a visual check.
3
Hydraulic tank cap breather
clogged
It is presumed that the breather in the cap of hydraulic tanks is
clogged, thereby causing negative pressure inside the tank. Make
a visual check.
4
Hydraulic tank strainer
clogged
It is presumed that the strainer in the hydraulic tank is clogged,
thereby causing negative pressure in the suction circuit. Make a
visual check.
5 Piston pump defective
The piston pump is suspected of an internal failure. Check the
pump itself.

Komatsu PC130-8 Specifications

General

Brand	Komatsu
Model	PC130-8
Category	Excavators
Language	English