Posted by ScottyHOMEy on May 20, 2009 at 10:53:54 from (70.105.242.219):
In Reply to: Re: Leak in left rear posted by Tom in Iowa City on May 20, 2009 at 08:57:30:
Okay. If the leak is on the outside and you see no oil near the rectangular cover for the butt-end of the differential shaft, then it is likely from the seal on the axle. That's pretty straightforward and can be done with the final drive still mounted to the tractor - remove the pan and the bearing cover on inside end of axle, remove bolt, and then axle (making careful note of the order and direction of the gear, spacer, washers and other parts) and have a helper let the bull gear down so that nothing gets dinged or broken (gears OR toes). Replace the seal which is inside the bearing retainer on the outside end of things, reassemble, replace oil. Go.
If, as I think we are actually talking about, the leak is manifesting on the inside of the final drive, then it is one of the two seals on the diff'l shaft. That will require removing the final drive. Not too bad a job. Can actually be done by hand if you take the pan, bull gear and axle out like I described above. What's left after that, especially on the left side, is more ungainly than it is heavy. Remember before trying to pull it away to disconnect the rod on the brake band at the clevis where it connects to the pedal. Two folks of average strength can then handle it easily. And having removed the pan, gear . . . gives you a dandy flat spot on the bottom to set it on. Remove the brake band from the drum (keep track of the anchor dowel) and the drum from the shaft and start looking around. To get to the seal on the final drive, you need to remove the rectangular bearing cover at the outside end of the shaft. A healthy bump on the inside end of the shaft will start it loose. (There is a snap ring on the outer end, but I'm pretty sure that all it does is hold the bearing in place on the shaft -- I don't THINK you have to remove it to bump the shaft out) The seal will be looking right at you on the inside face.
As far as the transmission end, the seal will again be looking right at you already. The seal can be removed and a new one installed without removing another thing. If your bearings are quiet, I wouldn't mess with removing the bearing retainer to change that particular bearing. If you think it needs changing out, just be mindful of the shims that are sandwiched between the retainer and the transmission case, and see that they are clean and back in place when you reassemble.
That's sort of about it as far as the wrenchin' part. A last thought about seals. There are two issues that may come up. One, I can guarantee, is that the new seals will not have as deep a shell on them. Some folks will recommend replacing the existing with two new seals with a liberal packing of grease between the two. Others say that a single new seal will work fine. Your decision there.
The other possibility is that the section of the shaft shere the seal rides may have been worn down to the point that a new seal won't be effective, at which point you get into the neeed for a speedi-sleeve. That's a whole other issue, but it may be needed, so that's a heads up.
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