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My lincoln ranger 250 no weld output

My lincoln ranger 250 engine driven welder has no welding output. Each time its used the current dial has to be turned up higher to maintain the same output. Now it won't even start an arc. The 240vac side works normal.

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Sounds like the transformer winddings which generate the amperage for the arc are breaking down

Posted on Jul 07, 2010

  • technoid52 Jul 07, 2010

    The is an engine driven generator welder. I thought you guys knew your stuff on here. I called up Lincoln tech service and got free information for the problem to be solved.

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If you check the wire A4 which connects the bridge to the current selector switch, make sure the connections are clean and tight. The sense wire parallels it and dirty connections on A4 can make more current flow through the sense wire than normal.

It is also possible the current sensor may be faulty, or has a bad connection, or is even seeing transient spikes from brush noise. The sensor connects to terminals 3 and 4 of J2 the 4 terminal connector on PCB1. And looks like a plastic and metal donut The sense loop for welding is supposed to be a single loop through and the generator sense should be 3 loops through.

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The engine has low oil level shutdown. It may be the reason for stopping.

Use the welder only at level condition. Check the oil level, before every start.
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No or little ac output


By ac you mean receptacles, not ac welding? 
If so what about welding output on AC (DC)?

If welding is OK then you may have breaker or fuse problem.
If welding output is also low or no output your problem is the generator.
You should check your gen rpm to be normal. If so you may have field problem: rectifier, AVR etc.
If you can measure the field DC voltage at rated rpm, if it is missing (very low) try to find any circuit broken.
If you do not succeed answer this instruction in order to give you more.

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Welding in TIG mode. Weld for 10 minutes, stop


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