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I've done this recently. On mine, the bull pinion (pinion shaft) had some rust on it. The seal will work better if the shaft is clean and smooth. On a smaller tractor like that, it might be easier to deal with it if you pull the wheel off. I've got an 830CK with 23.1-26 tires full of water, and no fork lift, so that wasn't an option for me. There's a stack of shims underneath the bearing carrier which set the adjustment of the differential. Make sure they go back in exactly as they came out (if you're doing both sides, do them one at a time to keep everything separate). When I was doing this, I had the shims for the right side stacked on the front porch. A huge storm came up and blew them all over the front yard. I thought I found them all, but when I was walking the side pasture, I found another one, so I'll have to pull my bearing carrier again. Actually that's good news, because my differential has been whining more than I remembered. Hopefully putting that shim back will make it happy again. The only other thing to do is clean out the drain holes. Case very wisely realized that no seal is perfect forever, so they provided a way for the oil to leak out without getting on the brakes. If your brakes are oily, the drain hole is plugged. When you have the carrier off is a great time to clean all the scrud out of it.
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