Kubota B2910 Rear Axle Leak and Transmission Leak

hthomure · Mar 5, 2017

Hello, all. I haven't been on in a while. Work and winter have kept me off the tractor for several months. But with spring comes a new batch of leaks and problems. I went out the other day and found myself confronted with three new leaks that weren't there last fall. I usually put the baby in the shed for the winter, but this year, I had some major projects in there, and there simply wasn't room.

Anyway, one of the leaks was pretty straightforward, and I already have it covered. One of my hydraulic cylinders on the loader has a bad seal so it's hemorrhaging fluid all over the place. But I know how to take care of that. It's the other two I'm nervous about.

The easier of the two (I think) is in the rear axle. I think it's an oil seal. What I don't know is how to replace it. I suspect I'm going to have to remove the rear axle case, and get to it from the inside. But, again, I don't know how to do it. The service manual is no help at all, and I can't find a youtube video to help (which was a big surprise in itself). I've included a photo with an arrow indicating exactly where the leak is, just in case I'm barking up the wrong tree.

The last one has me very intimidated. Partly because of where it is, and partly because I have no idea what I'm even looking at. It's in the transmission, but that's all I got (sorry). I was able to track it down by spraying and cleaning the area, then waiting for the leak to show itself, which took all of about ten seconds. It's pretty substantial. The thing is, I have no idea what I'm even looking at, let alone how to repair/replace it. Again, the service manual is absolutely no help, and since I don't even know what I'm looking at, I can't really search for it. So I'm hoping someone can help me out. Here are photos of the leak. The view is from below and toward the rear of the transmission looking forward. The star thing is just for reference after I zoom in. The arrow is the round, rubbery gasket/diaphragm thing that I can't identify, which is where the leak is. I feel kind of dumb, but I'm clueless on this one.

Thanks for any help or advice. I'm completely lost this time.

s219 · Mar 5, 2017

Can you describe where that second leak is? Mid-PTO area? There are several caps and oil seals shown on Messicks parts diagrams for the various transmission, differential, and mid-PTO cases on that tractor, but without more detail I can't tell which part of the tractor this is. But regardless, it is probably just the cap/seal needing replacement, or at worst a new bearing and seal and cap. These caps are located on the outside of the case to seal up a hole where an internal shaft is supported by an end-bearing.

hthomure · Mar 5, 2017

Yeah, it's kinda by there. There are three shafts right there together. You can kinda see in the photo. I'm going to put one more I took up from a tiny bit farther away to see if that helps. The thumbnail is sideways, but it should open right.

hthomure · Mar 5, 2017

Ok, so here's a view from a bit farther back. I included the mid PTO for perspective. Thanks again.

moship · Mar 5, 2017

Post #4 I believe it is the back of the clutch housing. Perhaps the attachments will help ID the location. I tried to highlight p/n's in the attachments that I think your photos represent, but I strongly suggest you confirm they are the correct.

The parts diagram are from Kubota.com, Select PARTS from top Menu, Illustrate Parts List, Type in Model and follow directions.

Hope this helps.

hthomure · Mar 5, 2017

You know, I have my service manual out and all my photos, and then these part diagrams, and I think that plug might just be it. I'm going to research a bit more, but I think we may have found what I'm looking at. Now the question is going to be, what is involved in replacing it? How much of a nightmare is this going to be? And how do I even get to it? Ugh. But at least I have a working theory now.

Thanks for that.

deminin · Mar 6, 2017

I, too, have a B2910....bought it in 2002, and have about 800 hours on it. I have had very little trouble with it. I did have a hydraulic cylinder on the loader spring a good leak about 5 years ago, and rebuilt it. A couple of months ago, I noticed a slight leak on the other side of the loader....so I ordered a kit to rebuild it. In the interim, I put about 1/2 a bottle (16 ounces) of Lucas Oil Hydraulic Stop Leak, into the tractor, and over the last few weeks I have run the tractor and loader about 6 hours, and the leak has stopped. If the leak isn't real bad, you might try adding some of this Lucas stuff...It seems to help rejuvenate the seals....I have the parts on hand if the leak starts again.

BTW....where are you in central MO? We're South of Stover, off hwy 135

hthomure · Mar 6, 2017

deminin said:
I, too, have a B2910....bought it in 2002, and have about 800 hours on it. I have had very little trouble with it. I did have a hydraulic cylinder on the loader spring a good leak about 5 years ago, and rebuilt it. A couple of months ago, I noticed a slight leak on the other side of the loader....so I ordered a kit to rebuild it. In the interim, I put about 1/2 a bottle (16 ounces) of Lucas Oil Hydraulic Stop Leak, into the tractor, and over the last few weeks I have run the tractor and loader about 6 hours, and the leak has stopped. If the leak isn't real bad, you might try adding some of this Lucas stuff...It seems to help rejuvenate the seals....I have the parts on hand if the leak starts again.

BTW....where are you in central MO? We're South of Stover, off hwy 135

I'm just outside Fulton.

My leak is pretty substantial. At least the one in the cylinder is. The one in the rear axle is very small, but I think I'm still going to try to replace the oil seal, if I can figure out how to do it. The transmission leak, I think is that plug we identified earlier. But again, I have no idea how to change that thing out.

Leejohn · Mar 6, 2017

Go here and get a good parts manual. Index of Kubotabooks/Tractor Parts Manuals/

Looks like if you pull the floor up you can get to it. Next well be how to pop the old plug out. After you get the floor off post another picture. Have some ideals maybe.

hthomure · Mar 7, 2017

Well, I went and took a look a while ago, and it appears the plug is too far forward to be reachable from beneath the floor. It's more up under the rear of the engine. I think if I were to remove the shaft just beneath the plug, I could reach it. I just need to figure out how to remove/replace it without damaging anything. I'm kind of hoping I can get it ordered, then when I can see the new one, how to replace it will reveal itself.

Now I need to tackle the removal of the rear axle. It's amazing to me there are no videos on youtube showing how to do this. I guess I'm taking the rear axle case off, then going in and replacing the oil seal. Again, I'm hoping my experience doing other stuff similar will help guide me in figuring this out. The repair manual is really no help on this.