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I have an SP170T mig welder and the problem is the wire speed appears to run at max speed no matter the position of the rheostat. I checked the rheostat with a digital ohm meter. It reads zero at the minimum position and 5.75 at the maximum and does seem to work progressively toward the 5.75. Got any idea what may be the problem?

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  • hittman375 Nov 25, 2017

    I would think it has to be the circuit board if the potentiometer is good.

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  • 198 Answers

Posted on Dec 04, 2017

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6ya6ya
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Posted on Jan 02, 2017

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CarlGehrke
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SOURCE: electrical problem with mig welder

Call Lincoln Electric (the manufacturer) at 216-481-8100 and ask them to email you one.

please rate my answer,
Carl

Posted on Dec 03, 2008

luxur4
  • 92 Answers

SOURCE: lincoln mig welder

Check the earth clamp, make sure all the cables or in good condition and secured, if the unit is three phase, get an electrition the ensure all the phased are functioning. test the fuses with a meter, get back to me if all is OK

Posted on Jan 23, 2009

luxur4
  • 92 Answers

SOURCE: need wiring schematic for miller 140 wire feed welder

No problem,email, write or phone for this information, Miller personel are very obliging as are most Welding manufacturers.

Posted on Jan 23, 2009

jeremythious
  • 37 Answers

SOURCE: Mig welder

Sometimes dirt builds up at the beginning of the liner, at the drive. Eventually the dirt jams in there so much that it gets very hard to push the wire through it. Carefully cut the wire between the spool and the drive and secure it to the spool through a hole, so it doesn't unspool into a bird nest, then disengage the drive roller, the wire should pull out of the tip freely. If you feel resistance when you pull it out, either there is dirt at the beginning of the liner, or the contact tip is causing resistance. Without the wire in the drive, turn on the machine and try it watching the drive. Does the drive work freely now? Does it change speed with the rheostat? If its a problem with dirt, this is what I do, after you get the wire threaded back through the drive, liner and contact tip, and everything is working, take a small clean cotton rag and simply tie it around the migwire between the spool and the drive, in a way that the drive can't **** it in. This will constantly clean any dust/dirt off the wire before it goes through your expensive drive and liner. Whenever you change the spool, change the rag. Hope this helps, and please post your results.

Posted on Feb 08, 2009

CarlGehrke
  • 169 Answers

SOURCE: Wire feed not working Miller 250 mig welder

Hi there,
If the knob spins all the way around (and especially of it didn't always do that), it's broken. This could mean that the nut that holds the rheostat in place has come loose, or it could be that the wiper inside the rheostat has broken off the shaft. To find the voltage measurements, correct schematics, etc, I'd need to know the serial number of your welder.

Regards,
Carl

Posted on Feb 23, 2009

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Hi there,
If the knob spins all the way around (and especially of it didn't always do that), it's broken. This could mean that the nut that holds the rheostat in place has come loose, or it could be that the wiper inside the rheostat has broken off the shaft. To find the voltage measurements, correct schematics, etc, I'd need to know the serial number of your welder.

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