T173HL Over-Voltage

[boondockpeterson]

I have a 1992 T173HL, and the voltage while the unit is running is over 17 Volts. I have looked in the repair manual, and it indicates that either the Alternator or Voltage Regulator is the problem. The alternator is being checked right now at a shop beside my workplace, and I will perform the tests outlined in the repair manual on the Voltage Regulator tonight. I called a local parts dealer for Thomas skidsteers, but they want over $300 for the voltage regulator, and apparently Thomas doesn't have any in stock. If this turns out to be the issue, does anybody know what the Kubota part number for the VR is (Engine is v2203-b)?

 

[skidsteer.ca]

Is it a Korean Mondo alternator? There were used on Bobcats of this vintage
If so a common (and cheap @ $65) 60 amp Delco will bolt right up.
You may have to add a diode in one of the small wires, on my 853 the delco would back feed power to the injection pump solinoid and the engine would not shut off. A 1 wire "self exciting" Delco would have also fixed that problem. If yours has a pull to shut off cable instead of an electric shutoff this may not be a issue for you.
Ken

 

[boondockpeterson]

Is it a Korean Mondo alternator? There were used on Bobcats of this vintage
If so a common (and cheap @ $65) 60 amp Delco will bolt right up.
You may have to add a diode in one of the small wires, on my 853 the delco would back feed power to the injection pump solinoid and the engine would not shut off. A 1 wire "self exciting" Delco would have also fixed that problem. If yours has a pull to shut off cable instead of an electric shutoff this may not be a issue for you.
Ken

The problem was a broken wire at the 6 Pin connector from the voltage regulator. The wire that was broken was the voltage sensing wire, so when the engine was running, the voltage regulator was seeing 0V, and was not regulating at all. I fixed the broken wire, removed a bunch of corrosion from the 6 Pin connector, filled the connector with dielectric grease, and tested it again. Now the voltage stays below 14.4V.

 

[boondockpeterson]

The problem was a broken wire at the 6 Pin connector from the voltage regulator. The wire that was broken was the voltage sensing wire, so when the engine was running, the voltage regulator was seeing 0V, and was not regulating at all. I fixed the broken wire, removed a bunch of corrosion from the 6 Pin connector, filled the connector with dielectric grease, and tested it again. Now the voltage stays below 14.4V.

By the way, the voltage regulator is a Nippodenso 026000-2121.