That machine should have the tucker long axles. If not the process is the same but you will find a few different parts mixed in.
1. Remove the Track
2. Unscrew and or pry gently off the end cap. Some were screwed and some were just press fit.
3. Remove cotter pin/locking tab and nut.
4. Unbolt the outer bearing retainer and remove. Will have to start jacking up the rear end on this side to take the weight off and pry tap gently. This can be a little tricky.
5. Use a long extension and unbolt the sprocket. If for some reason you have the older tucker axles there will be a spacer/hub that is also bolted up to the sprocket but same removal process.
6. Slide the pontoon and sprocket off the axle housing. Sprocket stays in the pontoon for this.
7. Remove the hub. It is tapered and keyed. It may be frozen on so heat, lube, puller, and time may be required. (If you are lucky you may find the key way rotten away and the hub was slipping on the axle. Easy fix if the key way in the axle didn't flake off.
8. Remove the axle retainer bolts.
9. Remove the retainer. Should be some shims in here also.
10. Pull out the axle. You will have a race that is on the end, a tapered bearing pressed on the axle, and inside the housing another seal few inches in.
Good time to replace both seals and bearings/race. Let us know what you find and we love pictures!!!!
When you put it back in make sure you seat the hub and tighten that pontoon end nut well and after some usage tighten it again. Also a good time to address the sprocket if it is worn or broken teeth.