Scamp tire wear - Page 4 - Fiberglass RV


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Old 06-07-2013, 07:43 AM   #43
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[QUOTE=RogerDat;393458]
The only "adjustment" is done when it is manufactured, and that is what angle the arm with the hub spindle is connected to the rubber in the axle at, or down angle.[QUOTE]
They also adjust camber by bending the axle tube. Many newbies see the bend in the tube and think their axle has been bent through an untoward event. Though I'm not an engineer, I wonder if the up or down angle actually affects caster and is part of the reason for each manufacturer to recommend a certain angle for optimum function of the axle.

You can see how the axles are made here: Making Henschen Axles Tour

The first page of the tour shows the range of motion of the torsion arm. Although the numbers will vary by manufacturer and axle rating there should be some movement between the "no load", "normal load" and "extreme shock" positions, as pictured. Most manufactures provide the specifics for the values. My observations are that a fully functioning torsion axle should typically have about a 3" range of motion.

Quote:
Originally Posted by Myron Leski View Post
So um...therefore, the only physical proof the axle is shot is rubber marks inside the wheel well and - "eaten" tires?
I posted an explanation of what to look for a few years back here:
Replacing an Axle - leading arm to trailing arm

I think consensus is that a torsion axle is meant to last about 15 years. One can extend the life by preventing deformation of the rubber by keeping the total weight off of the axle during storage. The rubber provides both spring and shock properties. Although on a normal spring axle the springs last longer than 15 years, the shocks will need replacement before the spring wears out.

I like to think of the torsion axle as single unit like a macpherson strut rather than a separate spring and shock. On a macpherson strut you replace the whole unit rather than a separate component.
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Old 06-07-2013, 07:48 AM   #44
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Wheel bearing problem

I had cupping on a tire. It was caused by the bearing nut not being tight enough allowing the tire to wobble.

I jacked up the trailer jetting the tire off the ground. I could take the sides of the tire and wobble it a little by hand. Took off the bearing cap and tightened the nut one location and every thing now aok with a new tire in place.
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Old 06-07-2013, 08:07 AM   #45
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I like simple solutions like check the bearing play.
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Old 06-07-2013, 11:17 AM   #46
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Check out today's axle close-up. Could I have just found the smoking gun I need?
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Old 06-07-2013, 11:33 AM   #47
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LOL how many smoking guns do you need? you already have at least 4.
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Old 06-07-2013, 11:36 AM   #48
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Quote:
Originally Posted by Roy in TO View Post
I like simple solutions like check the bearing play.
Back on Post #13 the OP wrote:

"Was no play in the hub, suggesting the bearings are good. They were well packed."
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Old 06-07-2013, 11:52 AM   #49
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So Carol, that's a "yes?"

If the play's the thing, there was no play.
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Old 06-07-2013, 12:23 PM   #50
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Quote:
Originally Posted by Myron Leski View Post
So Carol, that's a "yes?"

If the play's the thing, there was no play.
Well if you are looking for a Yes in so far as eliminating another possible cause for the bad tire wear other than the axle being shot then you have and your back to the 4 smoking guns pointed at the axle.

What you have confirmed by indicating there is no play in the wheel is you dont have a smoking gun pointed at:
1) shot wheel bearings
2) under tighten bearing nut

You currently have 4 smoking guns pointed at the axle:
1) 27 year old axle
2) low riding trailer
3) Tires hitting the wheel well
4) Uneven tire wear.


Myron, Roy has given you some great links with lots of info and advise on how to do a simple bounce test on the trailer to confirm the axle is shot should you need another smoking gun.
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Old 06-07-2013, 12:26 PM   #51
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Quote:
Originally Posted by Myron Leski View Post
Check out today's axle close-up. Could I have just found the smoking gun I need?
It looks like the arm has pulled out slightly, but I'm not sure how this translates into cupped tires. Is it loose inside the tube with the rubber elements?
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Old 06-07-2013, 02:53 PM   #52
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New axles, new brakes, rims, tires........ like the doctor told me, now don't worry, you are just going to feel ...a little pinch. My reply was "....oh, doctor!"

Spoke with my axle guy. I will tow the trailer to him Monday.
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Old 06-07-2013, 03:07 PM   #53
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Originally Posted by Thomas G. View Post
It looks like the arm has pulled out slightly
It sure looks like maybe a piece of rubber is hanging out too. I'd be interested in knowing if there is a measurable difference from one side to the other. Say from the outside of the torsion arm to the mounting bracket.

If you are getting a new axle spend the extra few $$ and get the bolt on kit. That will turn the next axle swap into a driveway job rather than a trailer guy job. Saving a few hundred the next time around.

If you get the trailer guy to put on a new axle, see if he will cut the axle in 1/2 a few inches in and get a picture of the rubber. I'd like to see the distortion after that many years. It might make it easier for others to understand the problem of the axle looking good from the outside.
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Old 06-07-2013, 04:14 PM   #54
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He will. If I had the means to safely weld the bolt-on brackets on I would do it, but I do not. Anyway I am concluding having a pro do the entire job is worth the extra cost. Some nights I hear voices whispering in my ear it has been many moons since I was invincible.

For what it's worth, here's the other axle side. By the way, I absolutely agree these posts are pointless if they are not clearly teaching something.
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Old 06-07-2013, 05:01 PM   #55
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Quote:
Originally Posted by Myron Leski View Post
New axles, new brakes, rims, tires........ like the doctor told me, now don't worry, you are just going to feel ...a little pinch. My reply was "....oh, doctor!"
I know you dont think it but those of use with older trailers feel your pain.... its a reality all of us with old trailers need to have to face at some point. The good news is if you ever sell the trailer in the future you will get your money back due to it having an newer axle. In the meantime looking at the old tire wear it might not be to far fetched to suggest that with a new axle and with a nice new pair of radial tires you find you get better MPG's as well while towing.
Now go have a stiff drink! I know if it was me I would!
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Old 06-09-2013, 01:07 AM   #56
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Quote:
Originally Posted by Roy in TO View Post
I wonder if the up or down angle actually affects caster...
Caster only applies to suspensions that steer. If this was supposed to say "camber"... no, I don't see how the arm angle of a fully trailing or leading suspension would affect camber. A semi-trailing suspension (like the Al-Ko Euro Delta Axle not available here) is another matter entirely.
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