Need to replace the oil seal on my shredder gear box- How do I find one? [Archive] - - The Friendliest Tractor Forum and Best Place for Tractor Information

: Need to replace the oil seal on my shredder gear box- How do I find one?

09-20-2008, 10:05 PM
My shredder's gear box started to leak oil (bad) thru the bottom seal - Took it apart today and found a wire had been warpped around the shaft and part of it slipped between the seal and the shaft- Din't cut the seal just opened a path for the gear oil to pour out.

Cleaned it up and reinstalled - The seal is holding pretty well , but but I'd like to get another one-

The shredder was purchased with the tractor (44 2N) and has been painted so thick I can't find anything to tell me the brand - it's pretty standard (5ft) and I seen a lot that look like it

The only markings are on the rear of the gear box AO(or-Q?)MO R-45-312

The bottom plate (which encloses the seal) has part number - AR40 314 (I think- reinstalled it before I wrote the part number down and the pic I have is blurred).

How can I find out what I've got?
Most important--Where can I get the part (oil seal)
how do I press the old one out?

Thanks for any input....

09-20-2008, 10:06 PM
Pics of the shredder

09-20-2008, 10:11 PM
Just take that part with you to a bearing supply place and they will caliper the three dimensions and match it.

09-20-2008, 10:21 PM
Thanks, LLigetfa,
Thanks for the prompt reply.
Unfortunatly the nearest one is 75 miles away and I don't think I could remove the old seal without destroying it - which is fine IF I have a new one on hand first..
I'm hoping someone chimes in and says it is a standard part number I can order over the web :praying:

09-20-2008, 10:58 PM
Post a close up detailed picture of the gearbox and someone will ID it and go from there.

09-21-2008, 09:53 AM
requested pics

09-21-2008, 09:54 AM
more pics

09-21-2008, 09:59 AM
even more

09-21-2008, 10:01 AM
and lastly

09-21-2008, 10:11 AM
Ther should be (or MAY be) a number stamped into the seal's outer steel ring or on the rubber seal itself,along with a brand name like "Chicaco-Rawhide","National",etc..look it over closely before attempting to remove it,for many times the I.D. numbers get destroyed during removal!..

You can probably pop that seal out with a screwdriver ot brake spoon ,used like a lever,don't hammer it out from behind unless it refuses to pop out,that way it leaves the part numbers intact in most cases,and lets you match it up to a new seal too..some places can supply seals just by giving them the measurements off the shaft it seals,and the housing O.D. and the width,if there is no number on it to go by..


09-22-2008, 12:08 AM
Thanks, guys.

It's not leaking so much I have to change it now-- Hopefully will get another couple of years with it as is.. If it get's too bad- I'll try to remove it (whole) and see if I can find a bearing supply company that can help me..

10-05-2008, 11:03 AM
my gear box says agmo R-45-312 on the casting and i just got areplacement seal number national seals number 473517 this is the lower seal and the upper seal number is 471192 My parts came from the local Massey Ferguson dealer. Hope this helps!

Ken N Tx
10-05-2008, 11:19 AM
:Welcome1: dzemcik..

Thanks for the heads up!! :fing32:

Enjoy all of the many Forums on MTF!!

10-05-2008, 09:03 PM
Thanks, dzemcik..

Welcome to MTF - You just added to my list of the best guys on the web!!

I'll check them out -- Getting tired of putting a pan under the shedder to catch the leaking oil!!!

10-06-2008, 11:50 AM
That looks very similar to one on the topper I use to cut mates field - next time I go I will get a close up picture - the oil filler hole is in same place and blades and plate look same

Tractor is Ford 1720 - taken bucket off front as he has a digger (back hoe )


10-06-2008, 12:54 PM
You can pop the seal out with a screwdriver or other item, just dont mess up the machined surface the seal sits in. Once out measure the OD, ID and Height of the seal. You can then go online and look for a replacement since the internet is closer than your local supply house. You can also go to a auto parts store, I would suggest NAPA, and get one as well.

10-06-2008, 12:55 PM
The right side gearbox on our Woods twin Cadet has had new seals & still wants to leak. We use grease in her now...last 5 years or more and working fine. We drop a whole tube of grease in there along with a little 140 gear oil. Yours won't hold that much, but fill it a little over halfway up, then a little gear oil. It really slows down the leak to where a tube lasts us a whole year of bush hogging. I use moly grease.

10-06-2008, 08:05 PM
Thanks guys-
I was planning on using grease if I couldn't find the replacement seals..
I stopped by Texas Bearing Inc on the way home from work and picked up a couple of seals-- They didn't have national brand seals but they found the exact match thru CRI. Posting here for anyone in the future that googles this mower..

top - National 471192 - CRI 13649
bottom -National 473517 - CRI 15517