The above reply is very good. If the contactor is buzzing, it will need to be blown out with high pressure air. When I was a welding repair shop manager, we washed every machine out with a pressure washer and then we blew the machine out with high pressure air. When dealing with high electronic machine, you have to avoid getting the electronics wet and high pressure air can damage circuits and wiring. Contractors are easily taken apart and cleaned. WARNING: Any work done on the inside of the machine should only be done with the machine unplugged or locked out. Good luck.
What I did to clean the machine involved using a siphon gun and compressor, first with a distilled water and detergent solution. Next, I thoroughly rinsed all of it with distilled water. Next, I rinsed thoroughly again with denatured alcohol to displace the water. I then used compressed air to blow the moisture away. I then waited two days before I tried it, possibly not long enough. But it sounds like I can take the contactor apart and clean it, hope so. Thanks for the help.
It sounds like you did a very good job. Yes the contractor can be taken apart. Be careful, make sure you either mark all the wires or separate them so you know where they go. Also there will be springs inside the contractor. Take your time.
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If water gets into electrical equipment the big danger comes from current flowing through the water / moisture where it shouldn't and damaging something.
The equipment needs to be dismantled and completely cleaned and then dried before applying power to it. This usually involves leaving it in a warm dry atmosphere for days, best with a dehumidifier and/or fan going.
Once current has done damage it usually means components need to be repaired or replaced, so be patient and wait until all moisture has been totally removed before applying power.
It may be possible to recover the welder even after it has been powered up by dismantling and thoroughly cleaning and drying if no permanent damage was done. All traces of silt and moisture must be removed from every electrical part before voltage is applied.
Good luck.
SOURCE: blower won't come on, contactor won't close
Check capacitor. Common problem. Replace if you need to. It will be swollen or oily if bad. Russ
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