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  1. #1
    Join Date
    May 2010
    Location
    denver
    Posts
    9

    Default Millermatic M-100 gun not firing, replacement or repair?

    Hi guys, I dont post much but was hoping for some insight?

    I have a Passport Plus (now discontinued) w/ the M-100 gun. Ive put several spools of wire through and countless hours. Ive noticed lately the gun wont fire, meaning when I go to start my weld it wont spark or feed?

    I checked the ground cable connections and they look good. Are the M-100 guns prone to breaking or should I be concerned with the machine itself?

    Looks like they sell a replacement trigger, which is what I suspect this might be?

    Any suggestions on what I should be looking for?

    Also, if I do need to in fact get a new gun what are my options for my setup. NOTE: I do a lot of tight spaces welding, so a smaller nozzle is nice.

    Cheers,

  2. #2
    Join Date
    Nov 2012
    Location
    Northern Arizona
    Posts
    499

    Default

    Pull the plug off from the machine and test for continuity through the trigger. Otherwise check the amphi connector at the machine for an good connection.
    MillerMatic 251
    CST 280 w/tig torch (for sale)
    Cutmaster 42
    Victor Journeyman OA

    A rockcrawler, er money pit, in progress...

  3. #3
    Join Date
    Dec 2010
    Location
    Andover, Ohio
    Posts
    101

    Default

    Did you contact Miller?

  4. #4
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    Trigger wire off in gun...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  5. #5
    Join Date
    May 2010
    Location
    denver
    Posts
    9

    Default

    Thanks for the reply, I will check the continuity and gun connection.

    I have not contacted Miller, it looks like the warranty on this has expired. My machine is 3+ years old now.

    Any suggestions on what a good replacement gun would be. Keep in mind I would prefer a smaller nozzle design for tighter areas.

  6. #6
    Join Date
    Jul 2008
    Location
    Delhi, Ontario:
    Posts
    1,971

    Default

    Quote Originally Posted by tarbellb View Post
    Thanks for the reply, I will check the continuity and gun connection.

    I have not contacted Miller, it looks like the warranty on this has expired. My machine is 3+ years old now.

    Any suggestions on what a good replacement gun would be. Keep in mind I would prefer a smaller nozzle design for tighter areas.
    You might want to try a gun from Praxair ( Prostar ) .
    I've been buying them lately & I'm very impressed.
    I really like the fact I can turn the neck 360 degrees when welding out of position !
    They run from 150 amps. to 400 amps.

    Norm

    Sunrise Outside My Shop In Delhi, Ontario

    - Arcair- K 4000 CAC.

    - LN-25 Wire Feeder

    - Lincoln Ranger 8- Engine Drive- CC\CV:



    - Lincoln Power Mig 180C
    - Spoolgun.
    - DeWalt Chop Saw .
    - DeWalt Compressor - 13cfm, @ 100 psi.

    www.normsmobilewelding.blogspot.com

  7. #7
    Join Date
    May 2010
    Location
    denver
    Posts
    9

    Default

    So it turns out I have a M-10 gun, not the M-100. Red trigger.

    Is the M-100 a upgrade from the M-10? Should I jump to a Bernard or Prostar? Budget wise Id like to keep in near $150?

  8. #8
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    Quote Originally Posted by tarbellb View Post
    So it turns out I have a M-10 gun, not the M-100. Red trigger.
    Its a new part number for the same gun...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  9. #9
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    1,009

    Default

    Just fix the gun and be done with it. You can often pull the trigger apart, then pull the micro switch apart and lightly sand the contact points. Otherwise a new trigger is about $20. Pull the connector at the welder and insert a bent paperclip into the terminals to jumper it and verify drive motor operation. Ohm out the trigger before you pull it all apart.

  10. #10
    Join Date
    Jul 2008
    Location
    Delhi, Ontario:
    Posts
    1,971

    Default

    Quote Originally Posted by tarbellb View Post
    So it turns out I have a M-10 gun, not the M-100. Red trigger.

    Is the M-100 a upgrade from the M-10? Should I jump to a Bernard or Prostar? Budget wise Id like to keep in near $150?
    The Prostar guns I've bought , run about a dollar per amp. = 150 amp.... $150.

    Norm

    Sunrise Outside My Shop In Delhi, Ontario

    - Arcair- K 4000 CAC.

    - LN-25 Wire Feeder

    - Lincoln Ranger 8- Engine Drive- CC\CV:



    - Lincoln Power Mig 180C
    - Spoolgun.
    - DeWalt Chop Saw .
    - DeWalt Compressor - 13cfm, @ 100 psi.

    www.normsmobilewelding.blogspot.com

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