Travel Speed Does Not Change Or Travel Speed Is Low/High - Komatsu PC200-8M0 Shop Manual

SEN06139-00
H-20 Travel speed does not change or travel speed is low/high
q
Failure Travel speed does not change or travel speed is too low or high
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
1 Malfunction of LS-EPC valve
Probable
causes and cri-
teria
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.
30
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Cause
a Troubleshoot with engine high idle (with monitoring function).
Travel speed
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Travel speed
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Travel speed
Speed shifting section of travel motor may malfunction. Check it.
H-20 Travel speed does not change or travel speed is low/high
Criteria and troubleshooting procedure
Travel lever
Lo
Operation
Mi
Hi
Travel lever
Lo Neutral
Hi Operation
Travel lever
Lo Neutral
Hi Operation
Monitoring
code: 01500
663 mA(PC200-8M0,
PC200LC-8M0)
578 mA(PC220-8M0,
PC220LC-8M0)
(See *)
424 mA(PC200-8,
PC200LC-8M0)
641 mA(PC220-8M0,
PC220LC-8M0)
0 mA
LS-EPC valve
output pressure
Approx. 2.9 MPa
{Approx. 30 kg/cm
0 MPa
{0 kg/cm
Travel speed shifting
solenoid valve output
pressure
0 MPa
{0 kg/cm
Approx. 2.9 MPa
{Approx. 30 kg/cm
PC200, 200LC, 220, 220LC-8M0
2
}
2
}
2
}
2
}