Travel Speed Does Not Change Or Travel Speed Is Low/High - Komatsu PC210-8 Shop Manual

40 Troubleshooting
H-21 Travel speed does not change or travel speed is low/high
Trouble

• Travel speed does not change or travel speed is low/high

Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
1 Malfunction of LS-EPC valve
Possible
causes and
standard value
in normal state
Malfunction of travel speed
2
shifting solenoid valve
Malfunction of travel motor
3
(speed shifting section)
*: Travel speed Lo can be adjusted with the adjusting function of the machine monitor. Accordingly, if the
initial value has been changed, the measured value varies more or less.
PC210, 230, 240-8
Cause Standard value in normal state/Remarks on troubleshooting
a
a
a
Speed shifting section of travel motor may have malfunction.
Check it directly.
Run engine at high idle and carry out troubleshooting
(with monitoring function).
Travel speed Travel lever
Lo
Operated
Mi
Hi
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel speed Travel lever
Lo
Hi Operated
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel speed Travel lever
Lo
Hi Operated
UEN00245-02
Monitoring
code: 01500
663 mA (PC210-8)
578 mA (PC240-8)
(* Reference)
424 mA (PC210-8)
641 mA (PC240-8)
0 mA
LS-EPC valve
output pressure
Approx. 2.9 MPa
Neutral
{Approx. 30 kg/cm
0 MPa
{0 kg/cm
Travel speed shifting
solenoid valve output
pressure
0 MPa
Neutral
{0 kg/cm
Approx. 2.9 MPa
{Approx. 30 kg/cm
1
2
}
2
}
2
}
2
}
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