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SA generator again ???

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Mike Settle

03-13-2001 08:07:02




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After the very helpful advise of Gene, Red, and David I ran both tests on the regulator and had no luck. I know very little about these old generators "but I'm learning" What and where is the commentator, and if it's fried how would that explain the generator charging after I spray contact cleaner in it. Sorry about all the questions but I've just always been a what for, how to, how come, sort of person plus it will give me and others who visit the board a better understanding of whats going on here. Thanks again.

Mike, Cynthiana Ky.

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Mike Settle

03-14-2001 04:27:37




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 Re: SA generator again ??? in reply to Mike Settle, 03-13-2001 08:07:02  
I cleaned everything very well last year when I went in for open generator surgery. I'm going to go through it one more time and double check everything and make sure I didn't over look anything. It just really gets my goat that after all of that work a little spray of cleaner will make it charge for awhile. It's going to be 60 degrees here in Ky today so between the hunny do stuff I may get a chance to look at it. I've got a new battery and a little 1 amp 6v charger so I don't have to get in a big rush. Have you ever had a little problem like this that just gets under your skin and you can't seem to get it out of your system?

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Bob M

03-14-2001 11:17:11




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 Re: Re: SA generator again ??? in reply to Mike Settle, 03-14-2001 04:27:37  
Mike - I've been there (little problem that defies resolution) more times than I can recall! Back in December the generator became very erratic on my Super H. Would charge fine on startup, then would cut out and back in without any pattern, other than that a hammer hit ANYWHERE on the tractor would always get it to work for a minute or two. I put on a new regulator, took apart the generator and turned commutator and put in new brushes, swapped generators, etc. without effect. Finally out of desperation I ran a temporary ground (wire with a couple alligator clips) between the regulator base and the battery ground post. Instantly the problem went away. Turned out the regulator mounting bracket (a 1/4" plate stamping bolted to the motor block) had enough corrosion between it and the block casting to cause in intermittant open to ground. This screwed up the regulator and hence the entire charging system. Live and learn! ...Bob M

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Mike Settle

03-14-2001 12:21:44




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 Re: Re: Re: SA generator again ??? in reply to Bob M, 03-14-2001 11:17:11  
I went through my generator last year everything is very very clean and I have new brushes. In the past I could open the dust cover and spray a little contact cleaner in it and it would start charging. Well today I said what the heck, I didn't have any contact cleaner so I sprayed a little, and I mean very little WD40 in it, it started charging to beat the band. If it does like it has in the past it will keep charging for a week or so or about 4hr of running time. Now if I can just figure the connection between spraying it and it charging I'll be all set. haha

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Bob M - w/link to photos

03-13-2001 18:15:34




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 Re: SA generator again ??? in reply to Mike Settle, 03-13-2001 08:07:02  
Mike - Sometimes a picture or two is helpful. The link below is to before and after shots of a bad starter commutator from a Super M. (The commutator on a generator is almost identical). If yours looks like the "before" shot, you've likely found your problem!

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gene b

03-13-2001 17:43:06




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 Re: SA generator again ??? in reply to Mike Settle, 03-13-2001 08:07:02  
sometimes finding a gen shop is hard to do the slots between the comutator bars need to be cleaned and the end will have to be turned on a lathe get a price as you can get a rebuilt one for 75exchange field coils will probably run 40 or so installed the arm can run another 45 or so that is why I do my own work if the fields are bad or an armature is bad the best way is a rebuilt cheaper in the long run get a good estimate first

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Bama Binder

03-13-2001 08:25:46




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 Re: SA generator again ??? in reply to Mike Settle, 03-13-2001 08:07:02  
The commutator is the copper contacts that the brushes "brush" up against. My experience is limited, but I have taken a generator apart (it wasn't working and full of dirt dauber nests) and cleaned everything inside the generator and used a dremel tool with wire brush to take the carbon/dirt off the commutator.

I put everything back together and Voila!!! It wasn't hard, but it did take 4-5 hours because I didn't know what I was doing and had to figure out the hard way. You have to polorize your regulator after you do this (I did anyway).

My theory on why it worked for a little while is that the liquid in the spray helped because it was a conductor and helped the electricity pass from the commutator to the brushes. It cut through all the "junk" until it dried out.

My thought is shine up your commutator and try it then....best of luck...BB

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The Red

03-13-2001 08:20:39




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 Re: SA generator again ??? in reply to Mike Settle, 03-13-2001 08:07:02  
Mike I should have looked in the parts book before speaking yesterday. Your armature is probably bad. Take the generator to an alternator/starter shop and they should beable to fix you up.



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Glenn

03-13-2001 10:05:05




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 Re: Re: SA generator again ??? in reply to The Red, 03-13-2001 08:20:39  
If you take your regulator in with the generator, they can usually test it, too. The shop I deal with can test regulators.



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