Crushed roller bearing?

Really tough, but brittle.

I have hammered on bearings and races before and they take pounding for a time then yield by desintegrating. That tells me that a constant load is not a failure mechanism for the bearings mentioned; shock load is.

So where is the source of the shock? I doubt that the shock of a tire on pavement is adequate.

My 18 wheeler experience with high loads for long periods on roller bearings is a graying and dulling of the surface with slight pitting. If heat is included, due to inadequate lubrication, then there is some purpling of the medal.

My 2c.

Mark

Mark

From: medal
To: metal

Sorry,

Mark

I've seen countless tapered roller bearings over the years that have failed because of improper, or should I say, "insufficient" pre-load.

I don't know what it is about repacking wheel bearings that makes people think they need to be "backed off" a partial turn; that's the worst thing that can be done.

Running an unloaded tapered roller bearing is the fastest way I know of ruining it. They first get hot, then they start peeling like an onion.

Dunno, it must be a throw back from the old days of roller bearings or something.

Allan

Even the smallest of tapered roller bearings must be loaded and should be torqued to a minimum of 12 ft-lbs. They are designed this way.

The proceedure of pulling them to "snug" and then backing off to the "first available slot" is just plain the wrong way to do it and is an old habit which has been carried over from the old-fashioned 'ball bearing' type wheel bearing days.

And, I am certainly not trying to start a range war either,

Allan

• Poke

I don't have to; 'cause strangely enough, I've seen the same goofy instructions in some owner's manuals too. :>)

That doesn't make it right nor does it make it correct. Talk to any engineer or better yet, just simply take a few minutes and think about the design of the bearing itself. It simply has to be pre-loaded if it is tapered.

Furthermore, any Vo-Tech school or any Manufactures’ training course in the country will confirm what I’m saying here.

Hmmmm, now you don’t ‘spose just by chance that we are setting up the buying public for some future sales with this wee bit of hog-wash?

Hope you have a good day,

Allan

Yes, and I always "spin em" as I tighten to the torque spec just to make sure they seat right.

I think overtightening is way better on a tapered bearing than running it loose it it's cage. Run loose, the bearing is taking the "load" on it's edge and not it's face.

Pray for rain,

Allan

Agree with you 1000% on that one; you are right on the money.

Allan