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Old 04-30-2014, 09:01 AM   #1
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Axle bearing questions

Hey smart folks! Posting a question for my neighbor. Dexter axles on a non-Jayco (yes, he knows he made a mistake). He had a bearing dry out and fail a few years ago. All bearings and races were replaced. He had the work done and has no idea of the brand/quality of the parts used. Since then the dust caps gradually work their way off the hubs. He uses LOTS of grease in the hub and wonders if that could cause the problem. My guess is the replacement races and or bearings are "close" to the correct size but not exact and there is interference between the cap and nut, washer, top of the bearing... and over a few 100 miles vibration or direct contact works the cap off. We hand spin the hubs and cannot detect any interference. He's talking about replacing the hubs hoping that will solve this but I figure there's a simpler (cheaper) solution.

Opinions and ideas are welcome
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Old 04-30-2014, 09:09 AM   #2
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Why not just flair the edges of the caps out (gingerly) a little and see if the are tighter when you put them back.
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Old 04-30-2014, 09:11 AM   #3
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That's good Grump but he's tried that. Those caps don't want to be on his hubs.
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Old 04-30-2014, 10:29 AM   #4
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New caps?
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Old 04-30-2014, 10:34 AM   #5
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Thanks Blue. He's been through quite a few, new one every time one falls off.
Currently he puts a bead of silicone around the cap trying to "stick" it to the hub. It helps to hold 'em on but given time they will still work their way off.
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Old 04-30-2014, 10:39 AM   #6
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The caps are glued on with permatex and thats how they suggest you put them back on.
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Old 04-30-2014, 01:08 PM   #7
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Quote:
Originally Posted by eldermike View Post
The caps are glued on with permatex and thats how they suggest you put them back on.
Hmmm, never knew that. That's a good one Elder.
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Old 04-30-2014, 01:56 PM   #8
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Quote:
Originally Posted by eldermike View Post
The caps are glued on with permatex and thats how they suggest you put them back on.

I have never seen permatex on any dust cap. I have never had an issue with any coming off.
Is your neighbor filling the cap full of grease?? If so that could be the problem. No grease in the cap. If you could see how little of grease it takes to lube a bearing you would be shocked.
If the cap wont go on snug and flush the problem may be with hubs.
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Old 04-30-2014, 02:28 PM   #9
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Originally Posted by lx22f/c View Post
I have never seen permatex on any dust cap. I have never had an issue with any coming off.
Is your neighbor filling the cap full of grease?? If so that could be the problem. No grease in the cap. If you could see how little of grease it takes to lube a bearing you would be shocked.
If the cap wont go on snug and flush the problem may be with hubs.
The real answer depends on which axle he has.
On permatex use: Every boat trailer manufacturer uses it. Etrailer says that if you have a lose dust cap you can use it. And Dexters new eazy lube axles are designed to have the dust covers full of grease, that's how you lube them. You remove the rubber cover and pump grease and it back flows out filling the dust cover in the process. So it depends on which axle.

Call Dexter and tell them they will not stay on.
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Old 04-30-2014, 02:48 PM   #10
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Permatex is a brand name. What Permatex product are you referring to? They make, among many other things, Aviation Form-A-Gasket, a blue RTV silicone gasket sealant, anti-seize compounds, threadlockers, hand cleaner, etc.
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