Lincoln SP175+ sputtering

A broken wire where the gun connects to the machine or maybe a broken wire at the bottom end of the gun housing? The break probably won't be visible, but should show up with an ohmmeter or test light.
BobH
Reply to
BobH
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I changed the trigger on my gun a couple of days ago, thinking this would
fix my sputtering problem. It didn't.
When I take a shunt of wire, and pull the two trigger wire push on
terminals, and arc it straight across, it does the same thing. On, off, on,
off. If I hold it there a while, it eventually comes on. But it just runs
intermittently. Now that I have ruled out the gun, is there anything to do
short of taking it in for repairs? The circuit breaker is not popping.
Steve
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Reply to
Steve B
Is the drive roller positioned correctly for the wire size? Does the roller appear to run intermittently or is it that the wire is coming out in fits and starts?
Reply to
ATP
Check your primary power contactor and clean up the contacts. Use of the striker from a book of matches works rather well. Or 400 Emory paper
Gunner
"A conservative who doesn't believe? in God simply doesn't pray; a godless liberal wants no one to pray. A conservative who doesn't like guns doesn't buy one; a liberal gun-hater wants to disarm us all. A gay conservative has sex his own way; a gay liberal requires us all to watch and accept his perversion and have it taught to children. A conservative who is offended by a radio show changes the station; an offended liberal wants it banned, prosecuted and persecuted." Bobby XD9
Reply to
Gunner Asch
I'm going to take that side of the case off today and see what I can see. I'm also going to take the roller tensioner off so it can freewheel, and see if it still is cranky when the drive roller is disengaged. I did try wiggling the wires with the trigger pressed on, and that didn't make any difference, indicating that it wasn't a broken wire at that connection. Will look much closer today, and see if I can get this figured out. Contact points sounds like a good place to start.
Reply to
Steve B
Make sure the wire drum and feed system run freely. Roll out some wire and turn the machine OFF. Then pull on the wire with pliers and see if it all feeds smoothly. You may have some wire trapped underneath or between other turns on the drum.
Dave
Reply to
Dave, I can't do that
Oh..something I do on all my MIgs..is take a piece of Scotchbright and wrap it around the wire and tie it down with a cable tie. Right at the start point at the feed mechanism. Sometimes its weeks between uses, so this tends to help prevent rust from collecting in the feed tube etc etc
Change out the piece of scotchbright every so often, as it does wear out. Ive got a standard 4x6 piece inside each welder, that looks like the moths have gotten to them..but have been there for years. Doesnt take much each time I replace a piece. 1x1" or so.
Gunner
"A conservative who doesn't believe? in God simply doesn't pray; a godless liberal wants no one to pray. A conservative who doesn't like guns doesn't buy one; a liberal gun-hater wants to disarm us all. A gay conservative has sex his own way; a gay liberal requires us all to watch and accept his perversion and have it taught to children. A conservative who is offended by a radio show changes the station; an offended liberal wants it banned, prosecuted and persecuted." Bobby XD9
Reply to
Gunner Asch
Shot in the dark : Is this an issue of internal over voltage - e.g. the spark gap (if you have one) is burnt out and the voltage exceeds a level and the machine detects and shuts down... ?
Martin
Martin H. Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net "Our Republic and the Press will Rise or Fall Together": Joseph Pulitzer TSRA: Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal. NRA Second Amendment Task Force Originator & Charter Founder IHMSA and NRA Metallic Silhouette maker & member. http://lufk> I changed the trigger on my gun a couple of days ago, thinking this would
Reply to
Martin H. Eastburn
I was going to work on it today, but a friend of mine was thrown from his horse, and broke his shoulder. Called us from his cell, about fifty miles away. Lucky he had cell coverage there. He was with a friend up in the mountains. We had to drive up there, and get him into our truck and take him to the hospital. I had to drive his truck back with the two horses.
I am going to probably pull the cover tomorrow, and look at the contacts. If that isn't it, it has to go to the shop.
It's always something.
Steve
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Reply to
Steve B
Hey Steve,
Looking at this post, and the other replies.. I didn't see anyone mention the liner.. Have you changed that out?
Reply to
tnik
The liner has less than one roll of wire on it. I just talked to the Lincoln rep on the phone. Boy, are they helpful. He gave me the specs on motor voltage and how to check it. A clogged or kinked liner can cause the motor voltage to go up, and the circuit board automatically shuts it down. They do make a .045" liner for that model, which I will be putting on there anyway. I have done that with all my hardwire MIGS, and they last forever before clogging. $14.
So, I need to go out there and do several things to isolate the problem. Could be liner, could be circuit board. Might even have oversized wire in the wrong liner, or the wrong tip. Got a raft of stuff to do today besides, and yesterday was lost rescuing my friend from the woods after a fall from a horse. Maybe this evening after it cools off, or maybe tomorrow.
Will advise when I find out for sure so that this will be archived in case anyone else runs into this in the future. Thanks for everyone's help.
Steve
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Reply to
Steve B

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