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3 Brush Generator Back Plate Picture

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Gary_N_WV

06-12-2003 09:43:30

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I just posted a picture in the "Parts & Pieces" Photo Gallery of a 3 brush generator back plate.
Maybe it will help out some of you all when you are giving help to others.

3 Brush Generator

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jeb2n

06-12-2003 17:29:08

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Re: 3 Brush Generator Back Plate Picture in reply to Gary_N_WV, 06-12-2003 09:43:30

Ok, can you post a picture of what the FRONT of a 9N/2N generator looks like? I've asked for this before, but no one could help me. I'm trying to figure out how the pulley goes on, and what keeps it on. It appears that the pulley screws onto the threaded end of the genny shaft (obvious), and there is a groove where I assume a snap ring of sorts goes. HOwever, when I put my original pulley on the original generator (bought both separately), the pulley threads on so far, that it tightens against the housing and keeps the genny from turning smoothly. Is there a spacer that i'm missing here?

I also have about 1/16" of play front to rear. Been thinking about a rebuild kit, but it looks like the genny has been gone through already. I would really like an exploded view of the generator showing all rings, clips, pulley, shaft, and spacers if any. Can anybody get a pic of that for me?

Thanks guys.

Jeb

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Heres another...

06-12-2003 09:54:47

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Re: 3 Brush Generator Back Plate Picture in reply to Gary_N_WV, 06-12-2003 09:43:30

Only it is a '48 3-wire with a 3rd brush...

third party image

Salmoneye

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Gary R OH

06-12-2003 16:34:20

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Re: Re: 3 Brush Generator Back Plate Picture in reply to Heres another..., 06-12-2003 09:54:47

that is the same as mine except there is just a jumper wire connecting the two top posts on mine.

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duey

06-12-2003 10:43:05

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Re: Re: 3 Brush Generator Back Plate Picture in reply to Heres another..., 06-12-2003 09:54:47

Nice picture... but help me out here... is this a bit of an oxymoron... but of what use is a 3rd brush on a 3 wire setup??

Let me rephrase that.... why would an externally regulated generator need a 3rd brush?

Need an endplate and just happen to have one with a deactivated 3rd brush??

Am I a victim of "stupid people games"? A candidate for Letterman??? Inquiring minds and all that... thanks...

duey

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souNdguy

06-12-2003 11:18:58

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Re: Re: Re: 3 Brush Generator Back Plate Picture in reply to duey, 06-12-2003 10:43:05

Ok, I'll second that question... if the purpose of the external regulator is to 'regulate' charge rate by varrying field current... what is the 3rd brush controlling????.. they can't both be controlling field current can they? if so.. what determines priority?? etc,

Soundguy

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Salmoneye

06-12-2003 11:04:17

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Re: Re: Re: 3 Brush Generator Back Plate Picture in reply to duey, 06-12-2003 10:43:05

Quoting from the I&T FO-4 Manual:

"A two-brush, shunt wound, 6-volt generator, part No. 8N10000B, provided with an external vibrating type voltage regulator replaces the early three-brush unit, part No. 9N10000C, 2N10000, and 8N10000A units used on 9N, 2N and early 8N tractors. The generators used on 8N tractors after Serial No. 8N263843 is part No. 8N10001."

I believe my genny is part number 8N10000A, 3-brush and 3-wire...

HTH

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duey

06-12-2003 11:18:25

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Re: Re: Re: Re: 3 Brush Generator Back Plate Pictu in reply to Salmoneye, 06-12-2003 11:04:17

So if the voltage is controlled, then the charge rate (or amperage) takes care of itself, and it still leaves me confused as to the function of the 3rd brush... Understand, getting confused is a *short trip* for me... but nevertheless here I am.... confused.

Does turning the "third brush screw" do anything to the output of your generator???

On the 2N, turning the screw would adjust the maximum amperage output, without much care for what the attendent voltage was.... good reason to run the headlights while plowing, for instance.

Your tractor may NOT have had the CAUTION: CHECK BATTERY WATER FREQUENTLY decal if you have a regulator.... right?

I know, I know, so many questions, so little time... duey

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Gary_N_WV

06-12-2003 11:28:35

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Re: Re: Re: Re: Re: 3 Brush Generator Back Plate P in reply to duey, 06-12-2003 11:18:25

I think...one of the terminals on the side is a "ground" connection....

Check out the page below...scroll down to 8n10000a

Link

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duey

06-12-2003 12:24:32

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Re: Re: Re: Re: Re: Re: 3 Brush Generator Back Pla in reply to Gary_N_WV, 06-12-2003 11:28:35

Thanks, Gary!!

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