20 Most Recent Century Portable Plasma Cutter 82021 Questions & Answers

These machines are made by Lincoln Electric commercial division.

That right there is how you know it needs replaced. Trust me I have one that is doing the same thing.

yes

sounds like theres a problem with the transformer/diode assy. thats where your weld current comes from. if your inclined, remove the cover you will see a wire wound transformer with a diode or rectifier assy. look at the wire leads, some have tube insulation over them . inside the tube insulation you will most likey find an inline thermal protecter either soldiered or crimped . you can remove it and get a new one through an electronics supply co. you can also look on the circuit board for a fuse there also may be soldered. or worst case, board or diode assy is burnt . hope this helps .

This manual is available for download for $8 at:

http://www.centurytool.net/Century_82021_25_Amp_Plasma_Cutter_Owners_Guide_p/811-656-000.htm

Find out what consumables are going to cost for this machine. eBay is full of Chinese plasma cutters that sell for not much more than $300 and if you watch which one you buy you can get some pretty cheap consumables.

Is this being sold by a dealer or private individual? If a dealer, and they'll at least give you your money back if the machine doesn't work then it should be worth a couple hundred bucks. If a private individual is selling it at least have them hook it up so that you can see that it does, indeed, work and stick to a price below $150.

But check the price of consumables first.

lp

Try changing the O rings

You have a ground problem

electronic circuit is not working properly

Hi, Have you tried replacing your liner? The liner can get worn in the gooseneck. As the wire wears into the liner it creates a groove. The wire has +/- tolerances, and when it gets to the high side, it can cause the wire to catch in the smaller size groove, this will cause a studder effect. You can check your drive roll tension as well. The gun will run better with the cable extended, not looped in circles as is often seen.
As you mentioned it has been doing this from the start, check the liner size against the wire size you are using. You may need a larger liner.
I have found that a very high percentage of feedability issues come from incorrectly cut/sized/maintained liners.
good luck.

http://www.weldingtipsandtricks.com/Mig-welding-tips.html
http://igor.chudov.com/manuals/MX001.pdf

http://www.letstalksnow.com/forums/archive/index.php/t-15449.html
Your unit has severe limitations, "It will not weld 1/4" single pass" (sic) . apparently, check out the Forum above, Also you need to ensure everything is "Just So" as when of limited power as this is, the GROUND or earth must be REALLY GOOD CONNECTION, the INPUT mains supply must be good, and correct wire size used too. http://www.weldingtipsandtricks.com/lincoln-mig-welder.html
Please visit all the links, and read how to make it work better.

Northern Tool ?
They sell about 6 of them, I will need model and serial #.

you have a short in the inner shiled to the outter shiled, go to the welding shop and buy the inner plastic shield and replace it.

Lincoln owns Century and Marquette.