Farmall m transmission

Hello y'all I just wanted to say thanks to
everyone for your help to me and my
transmission rebuild on my M, I got the
roller inner axle bearings ordered and
after another close inspection at the outer
bearings they appear to be fine (to me
anyway) but replacing the inside with
rollers and not replacing the outside would
that cause problems for whatever reason?
And is there any other bearings that I need
to look at specifically that has failed and
caused a cracked housing by wedging under
bull gear or breaking a tooth on a bull
gear like mine had before, I thought the
main cause of that problem was the inner
bearing but I would like to know from some
of y'all, thanks alot
 
The inner big most liklely because it lets the bull gear drop down and cut the tranny out then not hard to push ball through bottom.
 
The bull pinion bearings (brake shaft) fail more often than the axle bearing in reality. You no doubt have the axle out or axle housing off, so now is the time to get the bull gear out of the way and pull those differential, bull pinion housings out and inspect those bearings. You can't pull those off without getting the bull gear off the axle but gear can stay inside rear housing.
 
Trent, what is the ultimate goal with the tractor here?

You're probably replacing original bearings which have been in there for upwards of 70+ years. There's no reason to believe that if you go back with original style parts, that the tractor won't last another 70+ years especially considering that you aren't plowing with it for 12 hours a day like they did when the tractor was new.

The original bearings weren't weak on the M to begin with, and unless the upgraded rollers are cheaper than original style ball bearings, you're throwing money away on unnecessary upgrades that you will never take advantage of.
 
I am not aware of a roller for brake shaft and it is not necessary at this stage of a farmall m's life. What a lot of us don't take into consideration is that the bore that supports the bearing also wears so it does not support a replacement bearing like it did when new. Thus, why did original last much better than replacement bearing? Must be Chinese parts.
 
Thank you for the advice I just want to
restore my tractor to use it, maybe do some
?ntique tractor pulls and some parades here
and there but mostly for work, I just read
before that it's a good idea to go ahead
and replace that bearing with a roller if
possible and money previals. I know they
weren't weak to begin with but hearing the
horror stories of cracked housing made me
thinking about what I can do to prevent
that.
 
Would it of been more logical to buy a good
set of used roller bearings on eBay vs
putting the original ball bearing style
back in?
 
Like I have said a few times before, it is not necessarily the inner axle bearing that fails and knocks the hole in the bottom. Most often it was the bull pinion bearing. They get caught up between the teeth of bull gear and pinion, knock out a few chunks, (HAD ONE M TAKE PART OF 13 teeth OUT. Customer was wondering if we could weld them in. Nope. I have also seen the inner axle bearing fail, gear cutting a trench in the bottom of case, filling whole rear with fine filing but no hole. Fact is that Super MTA is still right out on the edge of town on light duty now days. Also, it is a very rare M that has original bearings. I don't know of any in this are at least . The old bearing were L numbers, like L 170 or something like that. I used to have a list of all the numbers of the bearing in all the old H's , M's and to 560, counting the balls so I knew if I was missing any or had too many when repairing. Have to remember, lot of repairs were not complete tear downs, especially in my early years working at dealer. Also, if those bearing fit decent, you will never wear them out BUT moisture in the gear lube will kill them just sitting around. Can't win.
 
Thank you Pete you have been very helpful to me to figure out what I need to do, while I'm replacing the housing gaskets I will replace those inner axle bearings with the rollers I have ordered I will inspect the bull pinion bearing but they seem to still be tight I may need to ask you a question when installing those new roller bearings
 

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