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Millermatic 251 is not longer driving wire

I run a university welding shop and found a bird's nest, near the rollers, that had changed color but not burnt out or melted . now the millermatic 251 is no longer driving wire. the drive wheels are not moving. and thus no wire coming out. electrics are working and running relays, gas control is working fine. not really sure where the problem is. could the motor be burned out? i am really not sure what the problem is, and would appreciate any help.
thanks
brady

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Posted on Jan 02, 2017

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SOURCE: Millermatic 200 will not weld

in put power supply jumper not set to right voltage

Posted on Jan 09, 2009

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  • 225 Answers

SOURCE: millermatic 200 won't weld

first check on the plate that tells imfo of unit ,there is what is called duty cycle.If the duty cycle says per say 30%,that means you can weld full power for 3 minuets before unit will shut down to cool.if it says 100% duty cycle there is no limit on weld time.this is the first thing to understand,if that is not the case check the main contactor where the power imput wires go,pull the gun trigger see if the contactor is pulling in , it should if not no welding amperage.

Posted on Jul 12, 2009

  • 5 Answers

SOURCE: wire doesn't feed

Either the trigger mechanism in the gun is bad, the servo that turns the feed wheel is bad, or you have too much tension on the adjustable tensioner knob. Take the wire out of the feed wheel, plug unit in and see if you can get the wheel to turn. If not, it is the trigger or the servo. If it turns, the tensioner was too tight.

Posted on Jul 25, 2009

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SOURCE: Lincoln Pro-mig 175 w/ no wire feed but relay clicks fan runs

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} The problem with my MIG 175 Pro is the "voltage selector switch" (part # M15750-1). I took it apart and saw all of the contact points where corroded. I can hold the knob between two settings and the machine will work.

I have the same issue only after about a year of very light use. I am not sure how to prevent this from happening again.

Posted on Sep 04, 2009

luis_david
  • 407 Answers

SOURCE: . Hello! I have a millermatic 251 and a 252,

Flux core wires will run on reverse polarity (gorund +), for solid core wires you need straight polarity (ground clamp at negative ). That will take care of the problem.

Posted on Jan 04, 2011

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I have a120 MW snap-on welder that the wire feed works i accidentally touched to ground clamp sparked, and know nothing. is there a fuse or breaker??? the wire feed works still


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Sounds like youve arced it out and the wire is stuck in the end of the contact tip but steel feeding possibly spitting wire out of the drive roll like we like to say birds nest
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First thing to check is that you still have an inlet guide (plastic funnel like) before the drive rolls. This one can be dirty or have enough build up inside that makes the wire feed imposible. Change this one if possible, it will cost you around 5 bucks at your near welding shop. If everything looks ok, then make sure you have the right drive rolls size, 023 or 030 in this case. Then ckeck you liner if it has a kink or dirty in the inside (use compressed air to blow the inside of the gun) then it's useless, change it. Final will be the contact tip just replace it for the right size according to the wire size.

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. Hello! I have a millermatic 251 and a 252,


Flux core wires will run on reverse polarity (gorund +), for solid core wires you need straight polarity (ground clamp at negative ). That will take care of the problem.

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A MIG welder is a complicated machine, unlike the stick welder. You can lose a lot of time if you must wait for someone else to fix the MIG. If you know basic troubleshooting for your welding machines, you can save a lot of time and a lot of money.
See if the wire is feeding properly. A worn drive roller can affect the feed and cause it to slip. When you're checking, look for debris and dirt on the liner. This can also cause bird nesting. Sometimes troubleshooting welding machines is as simple as cleaning it and allowing the wire to move freely.
  • Step 2 Look at the tip near the wire exit, inside of the gun. A worn out tip doesn't allow the electricity to efficiently hit and creates a lot more work on the job. Burn back can cause a bad wire.
  • Step 3 Clean the welding cup of the splatter. This task seems mundane, but troubleshooting welding machines usually involves clean components. Proper gas coverage cannot occur if the cup is plugged.
  • Step 4 Inspect the ground clamp. When this part is coated with oxides, electrons can't readily transfer. A bad ground **** can cause a lot of resistance and change the way that the current comes back to the machine.
  • Step 5 Examine the welding cable for worn spots. A badly worn can cause problems.
  • Step 6 Adjust the brake on the wire spool. Setting it too high or too low can cause problems with your machine operation.
  • Sometimes you can overlook the simplest things when you're troubleshooting welding machines, so always go from the simple to the more complex.
  • Always have a qualified electrician look at the parts on the inside of the machine.
  • Don't continually subject your MIG welder to thermal overload, which could cause permanent damage.
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    Welder skips when welding


    Hello there
    here are some easy steps to see if these will help you ok
    best regards michael
    1. See if the wire is feeding properly. A worn drive roller can affect the feed and cause it to slip. When you're checking, look for debris and dirt on the liner. This can also cause bird nesting. Sometimes troubleshooting welding machines is as simple as cleaning it and allowing the wire to move freely.
    2. Step 2 Look at the tip near the wire exit, inside of the gun. A worn out tip doesn't allow the electricity to efficiently hit and creates a lot more work on the job. Burn back can cause a bad wire.
    3. Step 3 Clean the welding cup of the splatter. This task seems mundane, but troubleshooting welding machines usually involves clean components. Proper gas coverage cannot occur if the cup is plugged.
    4. Step 4 Inspect the ground clamp. When this part is coated with oxides, electrons can't readily transfer. A bad ground **** can cause a lot of resistance and change the way that the current comes back to the machine.
    5. Step 5 Examine the welding cable for worn spots. A badly worn cable can cause problems.
    6. Step 6 Adjust the brake on the wire spool. Setting it too high or too low can cause problems with your machine operation.

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    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.

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    1 - Check the ground connection to the work, including the actual cable to clamp connection.

    2 - Make sure that the wire feed rollers are nice and clean. The wire needs to be clean too.

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    4 - change and or service the contact tip at the end of the gun.

    as always, gently clean out the loose junk inside the case. A clean welder is a happy welder. :-)

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