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Welding Shop

Miller Big 40 Gas ser#HH085788


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Old 02-14-2018, 04:14:30 PM
Beisert Beisert is offline
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Default Miller Big 40 Gas ser#HH085788

Ok bear with me it starts and runs great but the ac plug dosent work and it wont strike an arc. I cleaned the rings with fine sandpaper, checked the wound resistor and got 21ohm, checked the rehostate and it was all over the place so replaced it and still nothing I'm running out of patience,and money. Does anyone know where I can get a service manual for this thing. Also the small capacitor with three teeth on the side what does that control or regulate? any help is very much appreciated!!!!!!!!!
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Old 02-17-2018, 04:08:12 AM
dkamp dkamp is offline
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Default Re: Miller big 40 gas ser#HH085788

Something you can try...

Start it up. Plug an incandescent lamp into the AC plug. Find a big, stout magnet, and stick it on the outside of the generator case, around the exciter area, if you can figure out where that is (oftentimes, it's a smaller looking round segment near the non-driven end, or a belt-driven generator off the back end). When you have it in the 'right' spot, the lamp will glow a bit. At that point, let it run a while that way, and then add another device... like a small electric heater, to the other receptacle... turn it on low, let it run a while, then gradually increase the load. After a while, you'll be able to take the magnet off, and it'll stay glowing. At that point, attempt some low power welding. After a few passes, you'll be good to go.
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Old 02-17-2018, 10:13:08 AM
Beisert Beisert is offline
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Default Re: Miller big 40 gas ser#HH085788

Got it! it was a bad bridge rectifier.
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