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NAA Rebuild Update - Hub Swap

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ReidS TN-NAA

08-07-2005 07:37:02

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I got the axles out on both sides of Henry. I found the axle nut on the right side was extremely tight and required a little work to hub get off. That was also the side that had only one bolt holding backing plate on - all others were broken. The axle and hub were pitted but still looked OK. The bearings were pitted and basically fell apart upon disassembly.
The left side however- the axle nut was not tight at all - no cheater bar req'd to break loose. Bearings looked good as well as splice on axle are nice and shiny. When I cleaned everything up and just slid the hubs on the axles only I found that the right side (pitted-bad brgs) hub would slide up and I would have about 1.43" between hub on axel and end of hub - it also looked like the end of the axle is about flush with outside hub where the washer and nut would prevent locking hub down.
On left side I had about 1.54" cleanence between inside of axle bearing hub and end of hub - confused? I hope not. Question is - when I swap hubs - it looks like I have room to tighten down the hub to the axel - would this be OK? Putting left hub on right axle and vice versa. I know the I&T says not to shim - but i want this to go back together correct. Can you successfully shim the splines. How do you know when hub/axle interface is worn too much? Any advice? Going to scrape some more as the Farm Store won't have brake shoes and some bearings until Tuesday - so I still have plenty more work to do. Also - what would cause all but one of the studs to break going thru bearing retainer? It looked like an aftermarket Bendix plate - could have been defective studs? Can you replace those studs hopefully. Sorry guys - too many questions I know.
Thanks and be careful.

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Dan

08-07-2005 13:23:31

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Re: NAA Rebuild Update - Hub Swap in reply to ReidS TN-NAA, 08-07-2005 07:37:02

Hubs are not side specific and can be swapped. You know when it is time to replace your hubs and/or axles when the outside splines of the hub sink in deeper than the outside splines of the axle. This means the hub sinks in too far towards the body of the tractor and grinds your bearings on the bearing retainer, grinds down the brake springs, and causes oil seal leaks. Rustbucket had three of the four studs broken at the head on one side. You can replace these studs, they are still being made new currently at the right suppliers... Be VERY careful removing these studs - they mushroom easily if you bang on the ends trying to pound them out - then you will have to drill them out like I had to :-( Put the nut back on the stud just until it is flush with the bolt, then hit on the nut/bolt simultaneously. You can still do damage if you hit too hard, but it is much stronger in this manner. I contemplated shimming the axles - I just ended up buying a new axle and doing it right as I will use this tractor for my workhorse.

Good luck,
Dan

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