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 > Bent axle tube

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ExRocketScientist

Laurel, MD

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Posted: 03/08/12 06:02am Link  |  Print  |  Notify Moderator

For those of you who have bent an axle tube on a trailer, how did it happen?


ERS

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Posted: 03/08/12 06:34am Link  |  Print  |  Notify Moderator

Most trailer axles are 'bent' by design with camber in them to work under load while rolling. They should be bent up in the middle.


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rrupert

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Posted: 03/08/12 06:34am Link  |  Print  |  Notify Moderator

We had one on a Coleman Popup. I think it was because we were loaded heavily and got on some pretty rough roads. It basically lost its camber and had to take it to a spring shop be re-bent and braced. It was okay after that. If I remember correctly the axle was underrated for the weight of the trailer.


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Posted: 03/08/12 07:23am Link  |  Print  |  Notify Moderator

ExRocketScientist wrote:

For those of you who have bent an axle tube on a trailer, how did it happen?


Undersized axles of inferior quality (Lippert) = 2 bent axles.


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ExRocketScientist

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Posted: 03/08/12 07:58am Link  |  Print  |  Notify Moderator

PackerBacker wrote:

Most trailer axles are 'bent' by design with camber in them to work under load while rolling. They should be bent up in the middle.

I am aware of this, however, some people have reported having bent tubes that cause alignment issues. Some have been bent between the spring and the wheel. How did they manage to do that?

ExRocketScientist

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Posted: 03/08/12 08:00am Link  |  Print  |  Notify Moderator

Do the axle tubes slowly bend over time when they are overloaded, or is it a slow progression (i.e. perhaps every time you hit a big bump it bends a little more)?

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Posted: 03/08/12 08:18am Link  |  Print  |  Notify Moderator

In my case we drove to Indiana to pick up our tt last spring, by the time we got home 2 weeks later (1,100 miles) the axles were noticeably bent and abnormal tire wear was present.

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Posted: 03/08/12 08:29am Link  |  Print  |  Notify Moderator

My axles are 7k each and I have 13,600 dead weight sitting on them in the drive way. Not sure what each axle actually has meaning one might be over weight and the other might be under and then you factor in the bounce down the highway. I can see how a tube could be bent. In my opinion, there should be more of a fudge factor designed into the running gear on the coach but with most, not all but most brands, that is what they look at least or not at all.

I am about to upgrade to 17.5" wheels/tires and next year or so I am hoping to upgrade to 8k axles with hydraulic disk brakes. There aint anything cheap thats for sure.

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Posted: 03/08/12 08:34am Link  |  Print  |  Notify Moderator

8iron wrote:

ExRocketScientist wrote:

For those of you who have bent an axle tube on a trailer, how did it happen?


Undersized axles of inferior quality (Lippert) = 2 bent axles.


Partialy agree. I have 2 Lippert axles that bent. Don't know why. But they are not undersized in my case. Each one has a 4400# rating. x2 =8800#. My TT weighs 72-7300# loaded. The place where I took them to get straightend mentioned that they were made with soft material. So ya the quality is inferior, but they are rated okay.

Vulcaneer

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Posted: 03/08/12 08:36am Link  |  Print  |  Notify Moderator

ExRocketScientist wrote:

Some have been bent between the spring and the wheel. How did they manage to do that?



If bent between the spring and the wheel, this is generally referred to as a bent spindle. Because the actual axle, very rarely bends in that area. Reasons for a bent spindle are hitting something hard with that wheel, while carrying a heavy load over that wheel. Could be a pothole. Could be hopping a curb while making a turn, then dropping off the curb. Could be by pinching the wheel up against a curb, or something while making a turn. This forces the bottom of the wheel towards the inside, and the lateral pressure causes the spindle to bend at it's mounting point.

And then off course, overloading the trailer and hauling over bumpy roads can fatigue the axle over time. This fatigue can occur at the spindle mounting, the center of the axle, or any other point. Then there are those (seriously uninformed) that position a jack in the center (or toward the center) of the axle to lift the trailer to change a tire.

Probably many other reasons too. But honestly I don't know of any manufacturer that intentionally under rates a trailers axles. And there is a label that shows cargo carrying capacity. But people will still overload the trailer, and feel the trailer axles are under rated, rather than accept blame for themselves.


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