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Why is it bouncing?

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Geo-TH,In
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Joined: 05 Aug 2009
Posts: 23557
Location: terre haute

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PostPosted: Sun May 16, 2021 4:35 am    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote


When my trailer is empty it has the same bouncing problem. My smallest tractor 3100# stops the bouncing.
Trailer bounced more than ever.

I discovered one 10 year old tire was coming apart. New tires helped a little.

I think the harmonic bouncing may be fixed with shock absorbers.

Weight on trailer solves my bouncing.

Try playing with air pressure. Reduce air pressure when not carrying max load. Monitor tire temperature with IR thermometer.
 
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Geo-TH,In
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Location: terre haute

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PostPosted: Sun May 16, 2021 4:46 am    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote

Pete, I thought I was responding to author. Sorry.
 
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BarnyardEngineering
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PostPosted: Mon May 17, 2021 3:55 am    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote

Geo, your trailer axles are slightly misaligned. One axle is going one way, the other axle is going in a slightly different direction. They get far enough apart and POP, the trailer bounces.

With the weight of the tractor it forces the tires to scrub. Probably why one of them was bulging.

That's why you test tow new tandem axle trailers before handing over any money. If it bounces, take it back and get a different one.
 
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showcrop
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PostPosted: Mon May 17, 2021 4:00 am    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote

BarnyardEngineering wrote:
(quoted from post at 04:55:43 05/17/21) Geo, your trailer axles are slightly misaligned. One axle is going one way, the other axle is going in a slightly different direction. They get far enough apart and POP, the trailer bounces.

With the weight of the tractor it forces the tires to scrub. Probably why one of them was bulging.

That's why you test tow new tandem axle trailers before handing over any money. If it bounces, take it back and get a different one.



Barnyard, please tell how you made your measurements. The world needs to know!
 
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J.Wondergem
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PostPosted: Mon May 17, 2021 5:30 am    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote

showcrop wrote:
(quoted from post at 08:00:32 05/17/21)
BarnyardEngineering wrote:
(quoted from post at 04:55:43 05/17/21) Geo, your trailer axles are slightly misaligned. One axle is going one way, the other axle is going in a slightly different direction. They get far enough apart and POP, the trailer bounces.

With the weight of the tractor it forces the tires to scrub. Probably why one of them was bulging.

That's why you test tow new tandem axle trailers before handing over any money. If it bounces, take it back and get a different one.


I can tell you how I do it. Take a SMALL cable, make a loop around the hitch, on a goose neck, and stretch it back to the axle on both outer sides in the exact same spots. I learned that way from the truck garage where I worked. They aligned semi axles that way.


Barnyard, please tell how you made your measurements. The world needs to know!

 
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Geo-TH,In
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PostPosted: Mon May 17, 2021 9:09 am    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote

You may be right. I measured everything, It
checks out all good.
My 10k dump trailer works flawlessly at all
speeds.
I only have bouncing when empty around 35 mph. .
If I have to go a long distance empty, I reduce
air pressure and bouncing is also reduced.
 
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jdknucklebuster
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Joined: 08 Oct 2015
Posts: 70
Location: Otsego, michigan

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PostPosted: Thu May 20, 2021 6:26 pm    Post subject: Re: Why is it bouncing? Reply to specific post Reply with quote

I'm torn between comments made by Barnyard and Dr. Evil. I have multiple trailers and one of my tandem dual trailers
is also a hopper when empty. Kinda eliminates the load the tractor here or there comments. I was thinking about
Barnyard's theory of axle alinement and it really make sense. I like that idea. Dr Evil's comment of length of
trailer and axle spread or good too. I have a 35' Big Tex 12k with wide spread axles and that trailer pulls like a
dream. No hoppy or yanking. I know it has something to do with that distance between the truck wheels and trailer's
wheels in relationship to the bump in the road. Those two problems are completely different in my opinion.
 
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