Have a machine as listed above and the throttle stopped working. My Dad disconnected the linkage and was able to manually kill the excavator. After doing some research we have torn apart the cab looking for any wires that may have rodent damage with not luck. Also found some info that it could be the throttle stepper motor or the computer. After checking voltage at the steeper motor the 4 prong plug is 24volt and the 3 prong plug is 5volt. Can anyone tell me if this is correct or there is an issue there. Also the throttle dial shows 5 volts, the throttle computer has 2 red lights on each side with a green in middle. Any info would be greatly appreciated.
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Komatsu 120-5 Throttle not working and Key won’t turn of machine.
- Thread starter trwool
- Start date