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Big Blue 400d Airpak big problem


Tue, 31 Aug 2021 09:32:33 GMT
Hello everyone. New to this forum, not so new to welding.  I recently did some trading and got a big blue 400d airpak.  However I has a problem.  The engine runs, and everything spins. Air compressor works properly,   But, I get no output whatsoever out of the welding end.  No voltage from the welder leads, no voltage from the battery charge circuit, and no power from the ac receptacles.  I've already pulled and cleaned the brushes and slip rings.  Now where to go?  I can't seem to find any fuses to check.  An help would be be very much appreciated.Last edited by 7A749; 03-11-2017 at 07:52 PM.
Reply:Got a unit SN?  Might need it to determine the appropriate wiring diagram.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:Jf947528.  I'm thinking possibly is not getting excited?
Reply:That's where I was going.Apply 12VDC (+) to the center brush lead (wire #5) and (-) to the rear brush (wire #6) for a couple seconds and see if it wakes up.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:Sounds good to me, after dinner will go down stairs and give that a try.  Thank you duaneb55.
Reply:By rear brush do you mean closest to outside of case or closest to engine?
Reply:I think Duane means the rear of the machine( outside of machine). I just went through this with a Miller Big 40 last weekSent from my iPhone using TapatalkSteve1990 Miller Dialarc 2501993 Miller Maxstar 140 STR2015 Lincoln MP2101966 Lincoln SA200 Redface
Reply:I fixed your title. Realized you prolly wanted it to say Airpak and not airplane lolExpert Garage Hack....https://www.facebook.com/steven.webber.948
Reply:Flashing the fields fixed it.  Put the power on it for a couple seconds, watched the volt gauge jump up. Checked that their was voltage at the leads, and then proceeded to burn a few rods with it cranked up for a bout 15 minutes.  Worked great!   Thank you for letting me know what the put power to!
Reply:Good deal. The flashing fixed mine as well. As least the no output issue. Had to fix some wiring that a previous "expert" had modified. Sent from my iPhone using TapatalkSteve1990 Miller Dialarc 2501993 Miller Maxstar 140 STR2015 Lincoln MP2101966 Lincoln SA200 Redface
ReplyBig Blue 400d Airpak big problemol.   The only thing that didn't come back to life was the battery charge connections, but I'm not sure how much I will need them.  Would be nice if I can figure that out, but I don't even see that option listed in the owners manual as an option.
Reply:i have a miller 400 air pak kb133100 welder that will not weld, not very electrically inclined but am mechanical, if anyone has any advice on how to excite it it would be appreciated.
Reply:Maybe dancing around it naked, wearing only a welding hood while swinging your stinger would excite it?Sent from my SM-T377V using TapatalkTiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:Southpaw, I think most Big 40 welders would be puking oil out if we did that. Not much excitement in seeing one of us dancing.

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