MD transmission bearing failure

SW EM

Member
I pulled the bull pinion shafts today to
inspect their inner bearings. The right bull pinion gear had some chips on it so I
figured it was the one that had the failed
bearing. Turns out it was the culprit!

The bottom of the transmission case had a 8
in. long weld where a ball from a bearing
got caught under the bull gear. I don't know
the history on this tractor, but I am
wondering if this is the failed bearing that
caused this, or if this is another failed
bearing in this tractor's life.

Funny thing is, I would have never had
guessed all this was wrong with the
transmission when I was driving it around
earlier this year. Quiet tranny, no odd
noises. I only tore into it after I found
pieces of a ball bearing when changing the
rearend oil.
a151263.jpg

a151264.jpg

a151265.jpg
 
Could be, is that bearing IH? I would think though, if someone went through the trouble to repair the crack, they would have replaced the bearing that caused it.
 
Most times the bearing on axle behind bull gear fails for damage at bull gear. With bull gear still on axle you can look through holes and see if cage is intact and all balls in.
 
Yes, all the other bearings I could see and verify they were intact. The axle bearings were my first suspect though. The only ones I couldn't see were these inner bull pinion bearings. So that narrowed it down a bit. Sounds like the bearing can be purchased from an auto parts store. Has anyone done this lately and still has the updated P/N? If not I've got the IH number on the bearing.
 
I just went through that with a 450 here, but had to go through all the bearings in the TA, transmission, and rear end. They are pricey. If you post your bearing number here, I can probably find you a cross number to give to the auto parts store. Many times, if you don't have a real good auto parts store, they don't bother to dig real deep, and sometimes even if they are a good store, their books don't have IH cross numbers, like you can find on the good old web. Ebay is a good place to try your IH number though, many times you can find NOS bearings on there way cheaper. I bought 2 of the rear main bearings for my F20 on there, NOS USA made SKF bearings, that I crossed to my number, for .50. Yes, fifty cents, cost me 8 bucks to ship them. Only needed one bearing, but it was a lot of 2, and for fifty cents, how can you go wrong? A new replacement for that bearing is around 150-175 dollars for a lower grade.

Ross
 
(quoted from post at 21:20:15 02/11/17) Yes, all the other bearings I could see and verify they were intact. The axle bearings were my first suspect though. The only ones I couldn't see were these inner bull pinion bearings. So that narrowed it down a bit. Sounds like the bearing can be purchased from an auto parts store. Has anyone done this lately and still has the updated P/N? If not I've got the IH number on the bearing.

Just Googling usimg the IH number will get you a cross/replacement bearing most of the time.
 
They are all standard metric bearings. Measure with your calipers and then multiply by 25.4

SKF has an easy to use search function where you can input the bearing dimensions and get a part number. All the mfg's have slightly different suffixes and prefixes but the basic number is the same. The bearing in the photo is a maximum complement type as witnessed by the filling slots cut into the races.

Using an axle bearing as an example, a 214k would be the regular type and a 214W (timken) or 214M (MRC) or 6214 (skf) would get you a max type. They have online catalogs that explain their nomenclature systems.

For me it seems my most worn machines are the quietest ones!
 

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