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Old 05-06-2005, 10:48 AM   #29
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I was a machanic for over 10 years and I have packed my share of bearings. The trick is "packing" the grease into the bearing.

KISS method of explanation is:

1. left hand, glob of grease
2. Right hand, Middle finger thru bearing center with Large portion facing downward

with a patting motion, strike downward the bearing into the glob of grease till it starts oozing out the top of the bearing, THEN rotate the bearing slightly while packing the grease all the way around the bearing.

The grease needs to be pushed INSIDE the bearing and ooze out of the top for proper lubricatoiin.

I use latex gloves, NO Mess.

KISS = Keep It Simple Stup.. well you know the rest


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Old 05-06-2005, 11:40 AM   #30
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Am I correct that it is not feasible to inspect the inner race of these bearings, without destoying the cages? Prior to working on my Airstream, I have always serviced bearings (in the UK) that separate with a sharp blow to reveal both races for inspection, and a dirty floor covered with scattered balls or rollers. I have regularly washed out the Airstream bearings, inspected the entire surfaces of all the rollers and the outer races, but am unable to to check the inner race, other than by feel and sound. This seems unsatisfactory to me. Is there a way to inspect the inner races? Nick
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Old 05-06-2005, 12:10 PM   #31
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The surface of the rollers should tell you what the inner race looks like. There isn't any way to separate the cage and inner race if you want to use them again.
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Old 05-06-2005, 08:11 PM   #32
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twink

areosol cleaners are fine but expensive. for the cost of two cans of brakekleen i can refill my parts washer twice! kerosene is cheap, spray cans are not.

the nice thing about a parts washer is that you can let it run on a set of bearings while you are doing something else, like cleaning out the hub and spindle.

bottom line, get them as clean as you can, whatever method. then use a pressurized packing device. your vacations will be uneventful!

john
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Old 05-06-2005, 08:16 PM   #33
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So is it wrong to think I can use any other grease besides something that says wheel bearing grease specifically on the tube or tub?
no eric, you want to use only wheel bearing grease.

it doesn't matter if it comes from a tub or a tube. marine grease is for submerged axles, i don't think you will need that unless you expect to ford rivers with your trailer.

but with that new suburban of yours one can never tell!

john
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Old 05-07-2005, 08:48 AM   #34
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One thing that has not been mentioned here is compatibility of greases. Some greases are not compatible with others, another good reason to get the bearings clean before packing with new grease. Once I have my grease in a bearing, I don't have a problem with just pressure packing.
I am fortunate enough to have a very old air powered greaser that holds over a pound of grease. All I have to do is load the bearing, give it a quick shot of 90 psi air and the old grease is forced out and new is in so firm that it is a bit hard to turn the bearing. I make sure that I tighten the nut quite hard (about 25 lb ft)while turning the hub to get everything seated before loosening and adjusting by tightening to 15 inch pounds (finger tight) and then backing off one flat. How ever you do it, roller bearings need end play (.003 to .005). Tight bearings will burn up.
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Old 05-07-2005, 10:40 AM   #35
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Thumbs down Disc Bearing grease

Something no one else has touched on, is Buttercup, and others with disc brakes on their coaches, need to make sure the wheel bearing grease they are using is approved for use with disc brakes. Most of it is, but you can still buy grease that does not have a high enough temperature rating, and the grease will fail, causing bearing problems.
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Old 05-07-2005, 10:46 AM   #36
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Good point and in our case we did use a synthetic blend extreme temp grease - just because we could. Can't be too careful.
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Old 05-07-2005, 07:45 PM   #37
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Why not Warner hubs?

I may be using the wrong terminology, but bear with me a sec please.
I once had the bearings in a conventional sealed hub on a boat trailer totally disintegrate while in tow. I replaced both hubs with new bearings, new grease and Warner hubs... you know, the kind that have a grease zerc for re-packing. They served me well for as long as I owned it. All that was needed was a visual glance now and then to see if the seal cap was receding and needed more grease. A few squirts with a grease gun served the purpose, if needed.
I understand the need to periodically examine the bearings, but what is wrong with this type of hub on a travel trailer, assuming that the seal is airtight?
I can only imagine that old grease degenerates, gathers metal shavings and needs total cleansing and periodic replacement, much like an oil change in your car engine.
A Warner type of hub would at least signal if the bearings are low on grease and I would think that important. Why not put them on travel trailer wheels?
Any enlightenment appreciated.
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Old 05-07-2005, 08:18 PM   #38
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Rog,

I'm not sure what Warner hubs are, but they sound like Bearing Buddies.

Conventional wisdom (?) says that having the hubs completely filled with grease causes the grease to oveheat, expand, and force it's way past the seal. Then it leaks onto the brake linings.

Is this true? I don't know from my personal experience. I have BearingBuddies on my boat trailer, but not on the airstream.

My understanding is that the BearingBuddies have a small pressure relief hole that is exposed if the grease cavity is completely filled, beyond the limit of the spring loaded piston. I don't know as I have never filled mine that full.

When we have discussed this before, I think the consensus was to not use BearingBuddies on a travel trailer.
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Old 05-07-2005, 09:57 PM   #39
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Thank you Don (markdoane). Yes, Bearing Buddies are what I'm talking about.
http://www.bearingbuddy.com/
I had success with them on my boat trailer but I didn't know that they have been discussed regarding use on a travel trailer in such threads as:
http://www.airforums.com/forum...earing+buddies

Just more evidence that the proof is in the pudding.
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