Komatsu PC130-8 User Manual

SEN04124-00 40 Troubleshooting
20 PC130-8
H-18 Machine cannot be steered easily or steering power is low 1
Trouble • Machine cannot be steered easily or steering power is low.
Related
information
• Conduct the troubleshooting in working mode P.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Malfunction of travel PPC
valve
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Travel lever PPC valve output pressure
In NEUTRAL on both sides 0 MPa {0 kg/cm
2
}
Operated on either side
Above 2.7 MPa
{Above 28 kg/cm
2
}
2
Malfunction of pump merge-
divider valve
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Travel lever Solenoid valve output pressure
All levers in NEUTRAL 0 MPa {0 kg/cm
2
}
Position for travel only
(On either or both sides)
2.84 – 3.43 MPa
{29 – 35 kg/cm
2
}
3
Malfunction of travel junction
solenoid valve
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Travel lever Solenoid valve output pressure
All levers in NEUTRAL 0 MPa {0 kg/cm
2
}
Position for travel only on
either side
2.84 – 3.43 MPa
{29 – 35 kg/cm
2
}
4
Malfunction of hydraulic
pump (check valve)
The check valve of the hydraulic pump may have a malfunction or
its sealing may be defective. Check it directly.
5
Malfunction of hydraulic
pump (shuttle valve)
The shuttle valve of the hydraulic pump may have a malfunction or
its sealing may be defective. Check it directly.
6
Malfunction of pump merge-
divider valve
The pump merge-divider valve may have a malfunction. Check it
directly.
7
Malfunction of travel junction
valve
The travel junction valve may have a malfunction. Check it directly.
8
Malfunction of travel control
lever (spool)
The spool of the travel control lever may have a malfunction.
Check it directly.
9
Malfunction of travel control
lever (pressure compensa-
tion valve)
The pressure compensation valve of the travel control lever may
have a malfunction. Check it directly.
10
Malfunction of travel control
lever (suction valve)
The suction valve of the travel control lever may have a malfunc-
tion. Check it directly.
11
Malfunction of travel motor
(safety and check valve)
The safety and check valve of the travel motor may have a mal-
function. Check it directly. (It may be checked by exchanging the
front and rear motors or the right and left motors and checking
change of the phenomenon.)

Komatsu PC130-8 Specifications

General

Brand	Komatsu
Model	PC130-8
Category	Excavators
Language	English