Travel Speed Does Not Change While Travel Speed Selection Is Changed - Komatsu PC88MR-10 Shop Manual

E-26 Travel speed does not change while travel speed selection is
changed
(PC88MR-BQ3-400-A-Z0-A)

Travel speed does not change while travel speed selection is changed.

Failure
If Cause 1 occurs, actual travel speed does not lower when travel speed selection is
changed to Lo.
Related
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot
information
be measured at pump controller connector.
No. Cause
Hot short circuit in
1
wiring harness
Defective machine
2
monitor
Pump controller is
3
defective.
Circuit diagram related to travel speed solenoid
PC88MR-10
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V02 and connect T-adapter to female side.
3. Turn starting switch to ON position.
Voltage Between V02 (female) (2) and ground
If no failure is found by check on Cause 1, machine monitor may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no failure is found by checks on Causes 1 and 2, pump controller may be
defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting of electrical system (E-mode)
Max. 4.5 V
40-415