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9" Axle , Bearing Fit

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9" Axle , Bearing Fit Empty 9" Axle , Bearing Fit

Post  JACKAZZFLATZ 31st May 2011, 11:31

Now that the trans brake is workin, starting to have problems with the axle slipping out of the bearing. It moved approx. 1/4" after the first pass Saturday nite. I'm measuring .001" interference fit between the axle bearing surface and the inner race. Same for the lock ring. This would seem typical for a 1.532" shaft. HOWEVER, with the axle moving, it apparently aint enough.
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Post  dfree383 31st May 2011, 11:46

Their should be a locking collar on the axle too.
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Post  JACKAZZFLATZ 31st May 2011, 14:41

Yup, the locking collar is at .001" interference also.
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Post  dfree383 31st May 2011, 14:51

Last set of collars I pressed of where alot tighter than .001
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Post  JACKAZZFLATZ 31st May 2011, 14:54

I've bumped Moser Eng. about what they would like to see. Hopefully, they'll respond back.
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Post  JACKAZZFLATZ 1st June 2011, 15:17

OK, Moser Technical Group says .0025" -> .003" interference fit. The bearings they would furnish come from NAPA, 88128 R.
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Post  dfree383 1st June 2011, 15:24

Thats a little tighter than .001.. Smile

Have you measured your axels? are the wore out or under sized?
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Post  DanH 2nd June 2011, 09:38

if you heat (hot)the retainer for a drop on , it will be tighter than a press fit

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Post  JACKAZZFLATZ 3rd June 2011, 16:12

Here's the scoop: the bearing fit is supposed to be .001" interference fit, per my local SKF rep. Any tighter will likely take up all internal clearance in the bearing, and lead to failure. The lock ring should have .0025 -> .003" interference fit. Wouldnt hurt to use alittle loc-tite on it either, along with the bearing. There's not quite enough room to install another lock ring, and clear the internal housing seal.
Hopefully end of problem.
Moral of story - buy a quality bearing.
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