Replacing right rear drive axle seals?

[Douglas C. Box]

I have a 1949 cub and want to fix a leaking rear axle seal on the right side of the tractor. Before I attempt taking things apart, where can I find a nice exploded view of that right side final drive assy. It is leaking pretty bad and running down the tire to the ground when parked. I would really like to get it fixed. I am having trouble finding such pics in the various manuals I have seen. On these cold winter evenings I would really enjoy looking at schematics and planning the whole thing out in my head. thanks in advance. Doug

[Douglas C. Box]

Any special tools or just seal puller tool? Doug

[Rudi]

Doug:

Is this what you are looking for:



You need to check out the Cub Manual Server. Owner's, Service and Parts Manuals are available.

[Bigdog]

Before you change the seal drain and refill the transmission and also check the level in the final drive by removing the large plug with the square hole just above the pan. If the transmission is full of water and oil mix or overfilled with gear lube it can leak out the seal on the tranny case. The seals were designed to protect against splash lube and not submersion. If you still have leaking after the levels are correct you will need to replace the seals. The TC 37 parts catalog gives a pretty good view of how everything fits together.

[Douglas C. Box]

Yea that is exactly what I need to view. Oil seems to be comming from way up high somewhere. I dont have the tractor where I can run out and look at it but I think I could see oil comming out from a seal down inside a housing. I will check all the fluid levels first before going to work. Thanks. Have not had the cub long but am really enjoying it allready.

[Douglas C. Box]

Looking up thru the cut out in body 8 I believe it is #9 That a seal?

[Bigdog]

#9 is 381 907 R91 differential pinion shaft seal.

[bob in CT]

Please bear in mind that that #9 seal is probably not the source of your leak. The oil to that area comes from the big bull gear dipping in the oil pan below and transporting oil up. As mentioned before, the transmissions have a tendency to fill with water. Add water and the oil rises above the axle and it comes out of the seal on the transmission, into the axle tube and usually comes out around where the brake is, making it look like it comes from the final drive. That number 9 seal is actually one of the ones that is least likely to be a problem.

[Buzzard Wing]

The check level plug for the transmission/differential is the square plug on the left side below the hump in the case. Also, there are drainage holes directly below the brake bands. Poke them out and see if you get stuff coming out.

[bob in CT]

Those drain holes get plugged by grass clippings, mouse nest material, acorns, etc. so they weep rather than drain.
Most of the final dives I have inspected for the first time have mostly empty. That square socket plug is big enough to get a finger in there to see if any oil can be found. Most fill it up to just below the level of the pan gasket, but the plug is a level plug.

All of the transmissions have been overfilled due to water ingress.

[CPIII]

Welcome to the Cub family ...your comments are right in line with what mine were when I joined the forum...This is truly a great place full of folks that are willing to help at the drop of a hat. I have learned tons about my Cub and have really enjoyed bringin something back that was left to waste away. I hope that in time I can also share what I have learned here with others. Right now I am simply making like a sponge and absorbing eveything I can.......

[Douglas C. Box]

That is all great information! Thanks alot. Now I have some things to look at this weekend.

Guess I had better buy a gallon of 90W oil and fill everything up to the recommended level with good clean oil.

I will drain everything first. glad to know about the little weep holes in the housing to check. No telling what those look like! Doug

[ReTractor]

Please bear in mind that that #9 seal is probably not the source of your leak. The oil to that area comes from the big bull gear dipping in the oil pan below and transporting oil up. As mentioned before, the transmissions have a tendency to fill with water. Add water and the oil rises above the axle and it comes out of the seal on the transmission, into the axle tube and usually comes out around where the brake is, making it look like it comes from the final drive. That number 9 seal is actually one of the ones that is least likely to be a problem.

I can vouch for that! PO had 5 quarts (only supposed to be 3.5 pints i think) in the transmission and it was all oil no water he just plain overfilled it. I had oil coming out the hole near the brake band. Once i got the oil level correct the problem was solved. Very good advice to adjust oil level before tackling a job that may not be needed.

[Buzzard Wing]

Excellent... cause the other job is a pretty big one.

[JimT]

If you are going to change the fluid in the final drive you will have to pull the pan off the drain the fluid. You will need a new gasket to do this. There are no drain holes in the pans. Would be nice if there was a drain plug in the bottom of them. But I guess in some instances they could have been in the way and caused damage by hitting objects and not letting the pan slide over an object.