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?
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.
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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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?
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.
Pete from Virginia Beach
man comes into the world cold naked wet and starving, and after that things get worse. "Gun Smoke"
Joined: Sun Nov 23, 2008 2:46 pm
Location: Virginia Beach
Zip Code: 23453
Tractors Owned: . 48 cub 67 loboy 52 super c 74 cub 154 50 c
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.
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
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?