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Re: Milwaukee 6390 dead
I dont know how old the tool is but when I worked on them it was notorious for exploding the commutator and damaging the brush holders, hopefully yours didn't do that. You have voltage at both brush holder then I would remove the brushes (UNPLUG TOOL FIRST) making sure they are not sticking in the tubes and while they are out rotate the tool by hand and look for any noticable difference in the commutator bars. Check all the connections from the field to make sure the circuit is complete like it sounds that you have done and if so that just leaves the two items I mentioned. Let me know if I can help further.
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Lay the saw on its side with the screw in the handle facing up and battery removed... remove screw along the two half's of the saw.... you will see a seam where the left and right side meet... once screws are removed ( make sure you remember what screw goes where, there may be different sizes) lightly pry apart incase you missed a hidden screw, I'd so remove it... disconnect old broken switch and install new one... may have to order the part in
You can try to lube the bushings, but they will always start to squeal again. I have tried just about everything, 2 cycle oil works good, wd-40 is a little thin, blaster works ok for a while, reg 3m oil forget it, motor oil, no, white grease, hard to get in there, axle grease, yes, but you have to take the bushings out. The oils, you don't have to take the saw apart. Hope this helps.
We can only assume that this circular saw would be used
for small projects. Some tools are a perfect marriage for
batteries but the circular saw would not be one of these.
Cutting a large sheet of plywood and having it slow down
or stop completely in the middle of the cut is both a
nuisance as well as a safety hazard.
If you have already taken these issues into consideration,
then the choices are quite large.ie: Dewalt, Hitachi,Milwaukee,
are starting points. I would stick with the 18 Volt series though.
I would go to Milwaukeetool.com and download a breakdown for this tool. But all you have to do is remove the screws holding the handle assembly to expose the switch area and cord. I think they are a T-20 Torx, after removing the half make a note of the wiring before removing the old cord. trim the leads using the old cord as a guide and reinstall. what you want to do is when you reinstall the screws back them until you feel the first thread so you don't rethread it. These are thread forming screws and after a time they will strip out the threads. It is really quite simple
Could be quite a few, what is the model number. Do you have a volt ohms meter, if so check the cord first (UNPLUG) and across the switch then lock the switch on and check the brush holder leads. If you loose continuity anywhere in this process that is probably the problem. What did the brushes look like, did the mating surface look smooth or burnt. Let me know and I will try and help also give me the model number and brand, the header has 2 listed.
It is probably something like a 6365 and on all the Milwaukee products they have a switch wiring diagram but nothing for the switch. I would recommend going to a local repair center with the switch and match it up with a new one probably less than 15.00 If you give me your location with zip code I can direct you to the closest one. Let me know