Replacing transmission rear shields and bearing

Wed Feb 13, 2013 3:06 pm

We're going to open up a '49 cub next week to replace transmission shaft and front bearing, oil seal. I think we're prepared for that thanks to help from forum. However, my gut tells me that we should replace rear bearing and shields.

Understanding: Rear shield and bearing come out the rear. Front shield comes out front into the trans cavity area.

Questions:
1. Can we hook the rear bearing with a hand tool and pull the bearing and retainer out the rear once the trans shaft is removed?
2. How does the front shield come out, and get replaced? Does the trans cavity have to be cleared out of gears and rods?
3. Installing a new rear bearing from the rear - simply push/press it in with a 2x2 or other suitable object?
4. How is the rear shield installed?

Thanks.

Gene

Re: Replacing transmission rear shields and bearing

Wed Feb 13, 2013 5:06 pm

viewtopic.php?f=141&t=47391

Re: Replacing transmission rear shields and bearing

Thu Feb 14, 2013 9:19 pm

I dont think you can remove the bearing without removing the differential....it is in the way.

Re: Replacing transmission rear shields and bearing

Thu Feb 14, 2013 11:49 pm

Keep in mind that the rear bearing on a 49 is a larger roller bearing, not the needle bearing pictured in Bill E Bob's how-to.

One of the issues with that bearing is that the shaft itself is the inner bearing race for the rollers. It is induction hardened at the bearing surface. Most of them get a little chewed up so a new bearing may need a new shaft as well.

There is a work-around for this but it involves turning or grinding the shaft to .787" and using a modern sealed bearing as a replacement. My friend was able to remove the stock with a carbide tool on a lathe but it is hardened. The good news is finish is no longer important as it will no longer have a bearing rolling on it.

http://www.farmallcub.com/phpBB2/viewtopic.php?f=1&t=17999&p=130761&hilit=sealed+bearing+transmission#p130761

Re: Replacing transmission rear shields and bearing

Fri Feb 15, 2013 2:19 pm

I was able to remove the rear bearing on my 48 Cub without taking out the differential. The below photo was taken after installing new bearing and shield. With the input shaft removed, you can also drive the old bearing out the rear from the front side of the transmission case.
Rear Bearing Trans Spline Shaft_Rear Shield 001.jpg
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Re: Replacing transmission rear shields and bearing

Fri Feb 15, 2013 10:20 pm

I stand corrected.

Re: Replacing transmission rear shields and bearing

Sat Feb 16, 2013 6:53 pm

Bob in CT, or others....

I've been reading posts dealing with converting to the SKF 6004 bearing for the rear. Question regarding the bearing and shields for the old type. Using the 6004 sealed bearing are old shields needed - or would they even work?

Follow-up question, simply have the shaft turned to 0.787, install the 6004 bearing and nothing else needed for the rear shaft/bearing?

Re: Replacing transmission rear shields and bearing

Sat Feb 16, 2013 7:14 pm

Pretty straightforward. With the sealed bearing, you don't rely on the transmission lube for the bearing anymore.

Re: Replacing transmission rear shields and bearing

Sat Feb 16, 2013 7:22 pm

Thought so; but sometimes my thoughts get fogged up.

Thanks.

Re: Replacing transmission rear shields and bearing

Sat Feb 16, 2013 8:22 pm

I need to do the same bearing replacement. Do you have a link for the correct bearing? I found SKS 6004 RS. Would that be the right one? There were no dementions shown for it.

Re: Replacing transmission rear shields and bearing

Sat Feb 16, 2013 8:32 pm

From what I understand, the bearing is SKF 6004 2RSJEM (NAPA lists as 6004-2RSJ). Same bearing on e-bay, at McMaster Carr and NAPA. Dimensions:
42mm OD
20 mm ID
12 mm thick

Pete, the link provided above by Bob in CT has some excellent info and should answer.

Gene

Re: Replacing transmission rear shields and bearing

Sat Feb 16, 2013 8:37 pm

http://www.mcmaster.com/#6004-ball-bearings/=liddgr

I used the double sealed bearing. Watch out for Chinese stuff. SKF is a good choice.

Re: Replacing transmission rear shields and bearing

Sun Feb 17, 2013 4:17 pm

I was looking through the How To section of the forum and thought that may be there should be more in it, based on posts like this one were some one has done an up grade and provided all the information to complete the up grade. This post was helpfull to me and it is just my thought.

Re: Replacing transmission rear shields and bearing

Tue Feb 19, 2013 6:27 pm

Fun day yesterday in Hickory working with my son in splitting his Cub and solving some transmission/pto issues.

The trans front seal retainer WAS installed backwards. Replaced worn seal and installed correctly.
R/1st slider gear was chipped about 1/3 in on one spline. Replaced it.
Suprisingly, the trans input shaft was in fine shape. Rear bearing appeared okay.
Buttoned her up and gave her a test drive. Rear noise gone and pto worked fine.

Prep for question:
Prior to split/repair, the trans was flushed and filled with 85-140 gear oil.
Final drives were topped off.
Test run after the fuid change/addition, but noise was still there.
Noise gone after split and changes as noted above.

Question: Ideas as to probable cause of noise?

Thanks to everyone for all your guidance.

Gene

Re: Replacing transmission rear shields and bearing

Tue Feb 19, 2013 7:33 pm

equeen wrote:Fun day yesterday in Hickory working with my son in splitting his Cub and solving some transmission/pto issues.
Question: Ideas as to probable cause of noise?Gene


Gene,

Hard to say what may have been the source of the noise. I would think the chipped gear could have benn the culprit, but did you have noise in all gears or just 1st and reverse? Did you replace the front bearing on the input shaft? Did you have noise when driving on level ground or just going up an incline?