Diagram of Farmall Cub transmission??

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Diagram of Farmall Cub transmission??

Postby Gourdfather » Tue Apr 13, 2004 5:32 pm

I have a (supposedly) 1951 Cub. Apparently some sort of "idler" gear has a broken tooth, and it makes one heck of a clatter in Reverse and in 2nd Gear.

1st and 4th are fine (why I think it's some sort of gear common to 2nd and Reverse)

So, does anyone have a diagram of the transmission that I can check out BEFORE I start tearing into it???? :) :D
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Postby Bigdog » Tue Apr 13, 2004 5:39 pm

This will take you to the transmission manual on Rudi's site. The home button will take you to the home page of that site. You might want to bookmark it. It is a valuable resource along with the fellows on this board.

Transmission Manual
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Postby Gourdfather » Tue Apr 13, 2004 5:43 pm

Wow, thanks!!! Can't get much quicker than that!!!
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Postby Bigdog » Tue Apr 13, 2004 5:50 pm

We aim to please! Ya'll come back now! Ya'hear?
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Postby Rudi » Tue Apr 13, 2004 5:59 pm

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Postby Harold R » Tue Apr 13, 2004 7:33 pm

If you go to TM Tractor parts website, he has a good picture of the pinion shaft and the order of gear installation. I'll try and attach a link, but I'm on this old laptop.....dunno if it will work.
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Image

link: Gears
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Postby Dogman » Tue Apr 13, 2004 7:47 pm

may not be a cub if it has 4th gear???
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Oops....no 4th gear!!

Postby Gourdfather » Tue Apr 13, 2004 10:46 pm

Sorry, no 4th gear. I meant the racket is in Reverse and 2nd. 1st and 3rd are OK. {blush}

:oops:
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Postby Gourdfather » Tue Apr 13, 2004 10:54 pm

hr's49cub wrote:If you go to TM Tractor parts website, he has a good picture of the pinion shaft and the order of gear installation. I'll try and attach a link, but I'm on this old laptop.....dunno if it will work.
HR

Image

link: Gears


Yep!! Worked!! But I'm confused (not an uncommon occurence!!)

I see a 1st and Reverse idler, but I'm having the clackety-clak on 2nd (my "normal" mowing gear) and Reverse. My 1st gear (too slow for mowing) and my 3rd gear (too fast for mowing) are OK.

Well, now I'm confused again, I'll have to check it out again (once I get other parts put back on and running again) Thanks guys!!!

:?:
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Postby Jim Becker » Tue Apr 13, 2004 10:59 pm

Potential bad news is that second and reverse don't share any gears. The slider for R-1 is the only one shared.
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Postby Gourdfather » Tue Apr 13, 2004 11:09 pm

Jim Becker wrote:Potential bad news is that second and reverse don't share any gears. The slider for R-1 is the only one shared.


I was afraid someone was going to come to that conclusion. BUT...... :D I "thought" I was getting EXACTLY the same sound ("clackety-clak") in Reverse and 2nd gear. I'll have to check again; I don't see a shared connection there either :cry: I'll be back in a few days with a clearer picture of what I "think" I know :lol: :shock: :lol:

Jim, where in Texas are you?? I'm in Garwood, about 65 miles SW of Houston.
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Postby Harold R » Tue Apr 13, 2004 11:41 pm

Gourdfather,
Did you check your differential ring and pinion gear?
I just repaired the transmission on my 49. The differential broke where the left final drive goes in, allowing the shaft to wallow out the seal. So I replaced what broke, and installed a new 1-R slider speed gear. After spending all day getting it back together, I wished I had spent more money while I had it all apart and replaced all bearings and gears. Then perhaps it would go another 50+ years before a major malfunction.
I will also invest insome type of lift. I have a couple of small floor jacks, but nothing mobile to assist in "stabbing" the transmission back in.
I just picked it up and did my best jousting imitation.

This bit of diatribe comes to you from the city of Humble...TX. My home away from home.
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Postby Jim Becker » Wed Apr 14, 2004 6:59 am

John,
The problem may turn out to be a bearing. The bearings all carry a load (but varying amounts) in all gears.

I am in the Dallas area.
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Postby John *.?-!.* cub owner » Wed Apr 14, 2004 7:53 am

John, even though you're only noticing the sound in R and 2nd, check your wheel lugs, rim bolts, and wheel weight bolts. Also jack up one wheel at a time and reach in where you can touch each brake drum while you rock a wheel back and forth to make sure a drum isn't loose on the shaft. Somethings you learn the hard way. :oops:
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