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  • Another MM 135 motor issue

    Ive read a lot of the posts out there with the same issues. I ordered two new PTC fuses (incase I mess one up.. its 0.50$)

    My welder will feed no issue with no wire tension. If you click the trigger about 20 times, the PTC will heat up and stop the motor. Ive checked the other circuits in the board and they are all good. I cleaned out the motor and put new grease on the gears. If you add wire to the machine and tension it to "3" (advertised), the welder will weld for like 5 seconds then stop feeding. If you remove the wire, and power off the machine and turn it back on, the machine feeds again.


    I put my finger on the PTC1 and it got hot enough fast to burn me (oops), I know this is the function of this device, but how can you test them to be good? Are they just bad if you test them with a open circuit while cold? or can they degrade?

    It still feeds with no pressure on the wheel for a few clicks of the trigger. I saw some replace the Transistors, I didnt think it was needed as the welder still feeds, just not for long.


    I just wanted to make sure Im going in the right direction!

    Thanks.

  • #2
    Probably not, Id be replacing the gun liner, replacing the diffuser & tip and checking the tension on the wire drive. Something is causing too much strain on the drive and over amping it

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    • #3
      Originally posted by cruizer View Post
      Probably not, Id be replacing the gun liner, replacing the diffuser & tip and checking the tension on the wire drive. Something is causing too much strain on the drive and over amping it

      I thought the same thing cruizer, But i can get it to do it with no wire being fed as well. So with no "load" on the drive rollers the PTC is overheating. This eliminates the gun, liner, etc. I pulled the motor apart and cleaned it and the gears.

      Do PTC's just fail open, or can they degrade over time?

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      • #4
        Not entirely sure what a PTC is, though the drive in this unit I think is a worm and gear. generally the worm piles. Drives in this unit is cheap

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        • #5
          Originally posted by cruizer View Post
          Not entirely sure what a PTC is, though the drive in this unit I think is a worm and gear. generally the worm piles. Drives in this unit is cheap
          PTC as in the resettable fuse (thermal) on the board. (PTC1 location)
          Last edited by Dugan; 04-02-2015, 08:32 AM.

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          • #6
            I replaced the Re settable Fuse PTC 1 on the board with Mouser part

            576-60R185XF
            60R185XF
            60V POLYFUSE 1.85A

            Works great now!

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