Travel Speed Does Not Shift, Or It Is Too Slow Or Fast - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02633-03
H-21 Travel speed does not shift, or it is too slow or fast
Trouble • Travel speed does not change or travel speed is low or high.
Related infor-
• Set the working mode in P-mode before start.
mation
1 Malfunction of LS-EPC valve
Possible causes
and standard
value in normal
state
Malfunction of travel speed
2
selector solenoid valve
Malfunction of travel motor
3
(speed shifting section)
24
Cause Standard value in normal state/Remarks on troubleshooting
a
Travel
speed
Lo
Mi
Hi
a
Travel
speed
Lo
Hi
a
Travel
speed
Lo
Hi
Speed shifting section of travel motor may have malfunction. Check
it directly.
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel lever
Fine control
(such as releasing
decelerator)
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel lever
Neutral
Lifting operation
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel lever
Neutral
Operated
40 Troubleshooting
Monitoring [15]
690 mA
740 mA
0 mA
LS-EPC output pressure
Approx. 1.4 MPa
2
{Approx. 14 kg/cm }
2
0 MPa {0 kg/cm }
Solenoid valve output pressure
2
0 MPa {0 kg/cm }
2.84 – 3.43 MPa
2
{29 – 35 kg/cm }
PC300, 350-8
1