John deere model A generator

Problems · Feb 3, 2023

I'm restoring my 1940 john deere model A with electric start. I got the generator rebuilt and I'm installing the generator bracket, once I got it all together I noticed the generator will shake once and a while when the tractor is running. The pullys are closely lined up. I took the belt off and the generator bracket still shakes. So I'm assuming it just does that. Should I be concerned? It's mounted to the fan shaft mount, unlike on my 1941 where someone mounted it to the frame. It is also a 12 volt generator so I had to shim the original mounts to line up the pullies. At least it charges good.

used red MN · Feb 3, 2023

What does not shake on them things when they are running? ; > )

deeretails · Feb 3, 2023

Not an expert on these, but that doesn't look like the correct mounting bracket for a styled A. The parts book shows either bracket A3827R or A3380R depending on serial number.

Problems · Feb 3, 2023

My serial number is 491094, there is another spot in the parts book that lists the other 2 possible generator brackets which is B1593R. And that is what this bracket is. I guess since the generator is heavy and the entire bracket is mounted to just the fan shaft mount, plus the vibration of the tractor, it will just shake. I would think eventually because of all the vibration, the bracket would crack, but I've never had a tractor with this kind of bracket setup before.

vvfarms · Feb 4, 2023

Check clutch driver timing & flywheel timing.

Problems · Feb 4, 2023

Timing is good. The tractor barely shakes like my other ones. The front end doesn't bounce. And right where the generator bracket bolts with the 3 bolts I have pictured doesn't move. It's really just the end of the bracket where the generator bolts on is where the shaking occurs. I wonder if because the bracket doesn't have alot of support out where the generator mounts is causing the very little vibration of the tractor to show. Perhaps it can't be corrected.

rick deere · Feb 4, 2023

you need a bolt in the back hole of the bracket as well

Problems · Feb 4, 2023

I'm guessing you mean the back hole as in the back where the generator mounts to the bracket, and I do have a bolt in it shown in the 1st picture, I just didn't put it back in for the 2nd. Even with the generator (what appears to be) properly fastened to the bracket and the 3rd top chrome link, it will shake without the belt hooked up to it. I just saw I can post a video, although it is only 1 second hopefully you will able to see what it does.
<video width=90% src=https://www.yesterdaystractors.com/cvvideos/cvvideo146705.mp4 controls>http://forums.yesterdaystractors.com/cvvideos/cvvideo146705.mp4</video>

J.Wondergem · Feb 4, 2023

WOW, I'd think that you need another brace to the back on the generator some where to steady it.

Looking at the second to top picture, it looks like you could use another spacer on the other top bolt holding the bracket on the fan mount. That would steady it some.
Maybe I'm looking at it wrong. Is the bottom of the bracket attached to the fan mount too? The long bolt at the bottom.

This post was edited by J.Wondergem on 02/04/2023 at 08:40 am.

Problems · Feb 4, 2023

The bottom most long bolt is not connected
to the fan mount. It's is only those 3
carriage bolts, the bottom bolt is for the
generator, there is supposed to be another
one as well towards the back buy I just
didn't put it back when I took the
picture. I would think there would be
another brace like you suggested, but
without making one, I belive there never
was one. I will try equaling the spacers
like you suggested too to see if that will
work.

Problems · Feb 4, 2023

Well the generator still shakes a little,
but it is noticeably less. So I'm going to
call this good enough. I evened out the
spacers and made sure to crank down on
them. Thanks for the suggestion.

Problems · Feb 4, 2023

Here is something interesting I found while watching the john deere film what's new in 1940 apparently this tractor also has the same generator mount as mine. It appears that where the guy in the video is pointing at looks to be some kind of brace that attaches to the very front of the generator bracket, which would explain the extra hole in the casting that is not being used. Would anyone with a model B or A with a similar bracket post a picture of their setup?

55 50 Ron · Feb 4, 2023

Couple suggestions. Try one LONG bolt through the bottom of the generator rather the two bolts you are using. Or use a fully threaded rod in place of the two bolts. Use nuts on both sides of the generator mounts and tighten them very tight.

Is there a reason you are using such long bolts? A wild guess is that those long bolt ends sticking out without support MAY be causing a mechanical resonance which adds to the various vibrations.

One thing more. It looks like you could possibly re-mount the slotted tightener so its non-slotted end is attached to the mounting arm that is below the generator. That would make all vibrations be centered in the generator mounting bracket instead of some in the fan mount bracket.

Hope I'm making some sense. Hard to write all I'm thinking.

John deere model A generator

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