Travel Speed Does Not Change, Or Travel Speed Is Too Slow Or Fast - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting of hydraulic and mechanical system (H-
mode)
H-23 Travel speed does not change, or travel speed is too slow or
fast
(PC88MR-BQ4-400-A-Z0-A)

Travel speed does not change, or travel speed is too slow or fast.

Failure
Perform all troubleshooting with working mode set in power (P) mode.
If failure codes are displayed, perform troubleshooting for them first.(DW43KA, DW43KB)
Related
Travel speed selector solenoid (ON/OFF) can be checked with monitoring function.
information
(monitoring code: 02300)
No. Cause
Malfunction of travel
1
speed solenoid valve
Malfunction of travel
motor (speed switching
2
section)
*: Travel speed of Lo setting can be adjusted by using adjustment function of machine monitor. If it is changed
from default value, the value changes slightly.
40-500
Procedure, measuring location, criteria, and remarks
a Be ready with engine stopped, then perform troubleshooting with engine at
high idle.
Output pressure of
solenoid valve
Fine operation
If no failure is found by checks on causes (1), speed switching part of travel
motor may malfunction.
Travel lever: Travel speed:
NEUTRAL Lo
Travel lever:
Travel speed: Hi
0 MPa {0 kg/cm 2 }
Approx. 3.14 ± 0.5
MPa
{Approx. 32 ±5 kg/
cm 2 }
PC88MR-10