Travel Speed Does Not Change - Komatsu PC200-8M0 Shop Manual

400 Troubleshooting of electrical system (E-mode)
E-16 Travel speed does not change
E-16 Travel speed does not change
1) When travel speed selector switch is operated, display of travel speed monitor does not
Failure
change.
q
Related information
Cause
1 Defective machine monitor
Failure 2) When selection of travel speed is changed, actual travel speed does not change.
q
Related information
q
Cause
Hot short circuit in wiring harness
1
(contact with 24 V circuit)
2 Defective machine monitor
3 Defective pump controller
Circuit diagram related to travel speed solenoid
PC200, 200LC, 220, 220LC-8M0
Signal of travel speed selector switch can be checked with monitoring function.
(Code: 04504 Monitor 1st, 2nd line switches)
Machine monitor may be defective. (Since this is an internal defect, trouble-
shooting cannot be performed.)
When failure due to cause 1 occurs, actual travel speed does not decrease when travel speed
setting is changed to "Lo".
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot be
measured at pump controller connector.
1. Turn starting switch to OFF position.
2. Disconnect connector V04 and connect T-adapters to female side.
3. Turn starting switch to ON position.
Between V04 (female) (2) and ground
If no problem is found in check on cause 1, machine monitor may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no problem is found in checks on causes 1 and 2, pump controller may be
defective (Since this is an internal defect, troubleshooting cannot be per-
formed.)
Procedure, measuring location, criteria and remarks
Procedure, measuring location, criteria and remarks
SEN06138-00
Voltage Max. 3 V
35
40-400