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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Bearings packed

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JRscooby

Indepmo

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Posted: 01/05/23 05:45am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:


Centrifugal force while spinning combined with the grease heating up and becoming less viscous is the actual reason that bearings don’t run out of grease until there is just not enough left or it gets so old and crusty it quits working (like decades old stuff we’ve all seen it where the grease is actually cracked)


I think I disagree with this. Spin a cylinder, centrifugal force would the grease inside would spread evenly on the walls of cylinder. For spinning to force grease towards the bearing, a hub would need to be cast with smaller diameter at center compared to ends where bearings are. And that force pushing grease in would have to push the grease out of bearing to replace it. If seal holds, nothing moves. If seal doesn't hold...
And to the point about grease warming, flowing into bearing; How hot does your grease need to be before it starts to flow? And what is the heat source to flow the grease? IMHO, by the time my quality grease starts to flow, it is to late for grease to save the bearing.

Quote:

Either system can be used easily to freshen up the grease in a hub and add a little more for necessity or peace of mind.
But to do that requires one to have a little common sense and it helps to know about how much grease is already in there.


Let's use a little of that common sense, see if it should increase "peace of mind", especially if adding grease is necessary.
1 system pushes grease thru outer bearing, hub, (if full) into inner bearing. The other, pushes grease thru inner bearing, full hub, and into the outer bearing. And if you add a ounce of contaminated grease to 3 oz of clean grease, mix, you have a quarter pound of contaminated grease. So, even if the system pushes all the grease that has been in the bearing out, (A Harry Potter idea IMHO) there is contaminated grease on the way to other bearing.


Quote:

I don’t believe “full” hubs burn up bearings. But they do tend to push grease past the back seal and create more heat and friction.


On this we agree. Plus the work of cleaning all the contaminated grease that has never lubed a bearing out of hub when bearings are properly serviced.

mkirsch

Rochester, NY

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Posted: 01/05/23 06:25am Link  |  Quote  |  Print  |  Notify Moderator

Boon Docker wrote:

I must be a one man pit crew then. It takes me just a little over an hour to do my two axle trailer.


"a little over an hour" is billed as TWO hours...


Putting 10-ply tires on half ton trucks since aught-four.

Grit dog

Black Diamond, WA

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Posted: 01/05/23 07:46am Link  |  Quote  |  Print  |  Notify Moderator

Scooby, you’re basically arguing with yourself at this point…. Amazing the lengths some here go to, to disagree with about everything.
Oh well…if it makes you happy that’s the important part.


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Grit dog

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Posted: 01/05/23 07:48am Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

Boon Docker wrote:

I must be a one man pit crew then. It takes me just a little over an hour to do my two axle trailer.


"a little over an hour" is billed as TWO hours...


But in his lightning fast nascar diy 16minute wheel bearing service he’s saving the other 56 precious minutes of that second hour.
The more I think about this, the more laughable it becomes….

Huntindog

Phoenix AZ

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Posted: 01/05/23 03:00pm Link  |  Quote  |  Print  |  Notify Moderator

I am skeptical of the centrifical force and heat moving the grease into the bearings theory. For the past 45 years I have packed bearings the way my father showed me (He farmed until he 35)
Hand pack the bearings, then smear a coating over the spindle and inside the hub. Not a lot, just a coating This is to prevent rust if moisture finds it's way inside. What I have noticed is that at the next service, that grease is pretty much where I put it last time. It is not evenly distributed the way it would be if this "theory" was fact.
And I am in Phoenix AZ where it gets pretty hot... Just not hot enough for my grease to flow. Maybe I just don't drive fast enough for centrifical force to work either,[emoticon]



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Boon Docker

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Posted: 01/05/23 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

mkirsch wrote:

Boon Docker wrote:

I must be a one man pit crew then. It takes me just a little over an hour to do my two axle trailer.


"a little over an hour" is billed as TWO hours...


But in his lightning fast nascar diy 16minute wheel bearing service he’s saving the other 56 precious minutes of that second hour.
The more I think about this, the more laughable it becomes….


So Grit dog, what is so funny.
I'm curious.

JRscooby

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Posted: 01/05/23 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Scooby, you’re basically arguing with yourself at this point…. Amazing the lengths some here go to, to disagree with about everything.
Oh well…if it makes you happy that’s the important part.


You suggest the use of common sense, but then mention things that common sense tells me ain't happening.
Nobody should take what I say as 100% true, with no other thought. But that should apply to you, and any other expert.

mosseater

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Posted: 01/05/23 05:33pm Link  |  Quote  |  Print  |  Notify Moderator

If any of you have used the Easy Lube system "as designed" and taken your hubs off after towing, you will see the grease is right where you left it. And it's a frickin mess. You need very little great to properly lubricate a tapered roller bearing. Automotive history shows it's true. But hey, if you like buying grease, have at it.


"It`s not important that you know all the answers, it`s only important to know where to get all the answers" Arone Kleamyck
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klutchdust

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Posted: 01/05/23 08:13pm Link  |  Quote  |  Print  |  Notify Moderator

At my job we had 10,000 sea going container chassis at our terminal. About half were grease packed. The wheels/hubs would get pulled, new brakes installed,( maybe a brake drum if it was cracked or scored) bearings washed in solvent and inspected ,bearings packed by this handy press mounted to the top of a grease barrel and the hub filled about half way. Maybe one bearing failure a year. Maybe one axle removed and sent to the machine shop to be repaired. Out of 5K units.
You guys are overthinking this.

Grit dog

Black Diamond, WA

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Posted: 01/06/23 08:55am Link  |  Quote  |  Print  |  Notify Moderator

^Perzactly!
Pack the bearings, smear some extra grease in the hub/spindle cavity and let er buck.

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