753 axle bearings

[henry]

This is a follow up from yesterdays post about bearing rollers in chain case. Pulled axle today, no rollers missing so they were from previous owner. The axle tube is wallowed out in the seal area at 11:00 position about an inch wide. Strange. No other wear in tube. Seal was packed with rtv at that spot. Inside bearing was extremely loose with cage starting to bend out at spots. Outside bearing ok, but loose. Outside cup has me concerened. I could spin it in the bore with finger. Didnt take much to tap out. Bore looks ok except for torch marks from previous owner. Bearing #104949 Cup #104911. I am questioning if it had the correct cup. I searched the posts and found reference to a 743 that required the same bearing but the cup was 104912. What excatly is the 912 telling me? Is that a larger o.d. then the 911? I think a cup that is .001-.002 larger o.d. is what I need. Any guidance on that issue? Also anyone have a # for the seal? Could not find # on old one. Everything else in chaincase looks ok. Thanks for your help and Take Care

 

[Tazza]

Its possible its a larger bearing to take up for the wear. The previous owner let the bearing wear get too bad and it wore the axle tube. I remember another member that had a really badly worn tube, he got a shop to machine a new segment, he cut the old one off and welded in a new section, worked a treat. Its a lot of work though, if you don't have the gear, don't even try. The silicone seems like it was the only way to seal the shaft seal against the axle tube.
You really have limited options here. For the bearing cup there is no reason why you can't loctite it in so it does not rotate, but the hardest part is the axle seal, unless silicone will hold it in place.

 

[OldMachinist]

The only difference between those two numbers are the Da dimension below. The 912 is 3.06” and the 911 is 3.07” I've uploaded the complete Timken roller bearing catalog here http://www.mediafire.com/file/yn1myzgy0dy/timkenRollerBearings.pdf
The seal catalog is here http://www.mediafire.com/file/vmi0antqmyr/TimkenSeals.pdf

 

[henry]

The only difference between those two numbers are the Da dimension below. The 912 is 3.06” and the 911 is 3.07” I've uploaded the complete Timken roller bearing catalog here http://www.mediafire.com/file/yn1myzgy0dy/timkenRollerBearings.pdf
The seal catalog is here http://www.mediafire.com/file/vmi0antqmyr/TimkenSeals.pdf

Thanks for your help OM The only bad spot in the tube is at the seal and it was tight so either rtv or maybe some JB weld to fill up the void will take care of it. I read the story about the fellow that cut and replaced the tube. I have the capabilities and ability to do that but this isnt in need of it. I believe the Loctite is the way to go. I have some that I used on sloppy bushings. I have staked spots on shafts to tighten the bearing in the past This really isnt a problem at all. Thanks for your help and the Timken manual. Take Care

 

[OldMachinist]

Thanks for your help OM The only bad spot in the tube is at the seal and it was tight so either rtv or maybe some JB weld to fill up the void will take care of it. I read the story about the fellow that cut and replaced the tube. I have the capabilities and ability to do that but this isnt in need of it. I believe the Loctite is the way to go. I have some that I used on sloppy bushings. I have staked spots on shafts to tighten the bearing in the past This really isnt a problem at all. Thanks for your help and the Timken manual. Take Care

For the bearing I would use Loctite 603. It will fill gaps up to .005” and is oil tolerant. If the RTV around the seal didn't leak before it will likely work again.