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Left rear bearing problems? Here's your issue

11K views 18 replies 7 participants last post by  shadetree  
#1 ·
On the tube style rear axles (Foreman, Rubicon, 350 Rancher etc) we all end up with water in our axle tube on the left side, and a brake drum full of water on the right side. Sometimes we even replace the bearings and seals, and STILL get water in there.

Here's why.

This is on my 2006 Foreman FM. I replaced the left axle bearing and seal, but STILL had water getting in there.

Note the hub surface on the old hub, vs the hub surface on the new hub. That grooved area is what seals against the new seal. When you get grooves in the hub, it cannot seal up against the new seal you install, so water still gets in.

In the bikes i've worked on, a lot of them have grass or other debris wrapped around the hub which not only destoys the seal, but also eventually will groove the hub.

Sooo, if you're going to do a rear end rebuild, it might not be enough to replace your bearings and seals. Inspect your hubs and if the sealing surface is worn or grooved, you need to replace the hub(s) as well.
 

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#2 ·
cool, I guess its easy to miss things like that when your sure what the issue's

I know when mine seals/bearings went, I did look things over really good, and mine were still groove free and , haven't had any leaks since
but I also think checking them often and not running them when the wheel bearings start to go, don'
t wait till there REAL bad to replace, as by then damage is already done I bet!
another reason it pays to do PM 's more often and inspect things
 
#3 ·
Yep. Noticed some that were grooved much worse than that on an 06 I parted out a while back, and Basfnb's Rubicon (over on Hondaforeman) were MUCH worse that that.

We put new bearings and seals all through his rear end and he was still getting water in the brake drum and left axle tube. The grooves weren't allowing the hubs to seal to the brake drum cover and the end of the axle tube.

In looking at my 06, I found the same thing on the left side. The brake side hub looked good.

I also added grease zerks to my left axle tubes on my machines, and filled the axle tube with grease. It can't hurt anything, and if water does seep past the seal (like when we're duck hunting on the rigs, sitting in water for prolonged periods) it won't be able to get to the diff.
 
#17 ·
Good use for these would be on TRX250 and 350D rear hubs. No longer available, but I'm guessing most of them out there are grooved and won't seal up.

I've got a 250 rear end for some 300 project down the road. If the hubs on that are grooved I'll be getting some of these sleeves since OEM hubs are no longer available.
 
#18 ·
here is a better idea !. use a steel sleeve from a right rear hub !, they will be around for many years, they still use them on todays newer atvs, you would have to put the left hub on a lath , to turn them down so the steel seal can be pressed on ?, but this can be done over and over until they stop making the steel seals. not sure what kinda trouble this all would be ?, but worth a shot. I've got a spare hub or two around here I think ?, gonna study this :).
 
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#19 ·
just mic'd the left rear hub, seems it's smaller then the right rear ?, sooo..no lath work, maybe some welding to build it up ?..lol. I thought I had a used steel right hub sleeve ?, musta tossed it out, as the splines were shot..lol. if and when I find another steel sleeve ?, I will check this stuff out.