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magnetic pick-up/speed sensor
- Thread starter jey_c
- Start date
John C.
Senior Member
The current through the TVC is measured in milliamps and generally isn't something you need to do. The manual will give you an ohm reading range which has always worked for me.
Usually when the speed sensor quits working the computer dials you back to about 50% of pump absorption torque. You can shift the prolux switch which if I remember right would give somewhere around 65 - 70 percent.
How do you know the speed sensor is bad?
Usually when the speed sensor quits working the computer dials you back to about 50% of pump absorption torque. You can shift the prolux switch which if I remember right would give somewhere around 65 - 70 percent.
How do you know the speed sensor is bad?
John C.
Senior Member
jey_c
I was just asking to make sure I didn't steer you down the wrong path for troubleshooting your machine. I hope you didn't take offense with my question.
Here is an observation I've seen with the Komatsu speed sensor issue. When the speed sensors over heat and burn out from the bell housing being full of oil, the computer doesn't put out a fault code. I figured it was because the sensor is shorted through and the computer would sense a voltage on the ground side. What I have found was when there was a fault code, there was an issue with the wiring harness.
Good Luck!
I was just asking to make sure I didn't steer you down the wrong path for troubleshooting your machine. I hope you didn't take offense with my question.
Here is an observation I've seen with the Komatsu speed sensor issue. When the speed sensors over heat and burn out from the bell housing being full of oil, the computer doesn't put out a fault code. I figured it was because the sensor is shorted through and the computer would sense a voltage on the ground side. What I have found was when there was a fault code, there was an issue with the wiring harness.
Good Luck!