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axle snapped on tandem trailer| trailers2000| BEWARE

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Old 15th July 2010, 08:57 PM   #1
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Exclamation axle snapped on tandem trailer| trailers2000| BEWARE

Check it out, real clean cut.

Bearings were good and greased.

This was an expensive Trailers2000 trailer (custom built) rated to 2000kg GVM, why did it break?

After careful analysis and opinion from trailer experts it was due to extremely poor design, a typical case where the manufacturers self praise and back patting plus marketing blinds you to the real perfection in trailer design.

I was extremely lucky it broke when I was reversing up a customers drive, listen for it, EMPTY!

Just moments before I was going down the M1 doing 100km/h and that was after dropping kids off at a school where a wayward wheel that came off could have killed some-one.

I now drive in fear, and I think this is so serious I will report it to Dept of Fair Trading, if it were a car there'd be a recall.

Whilst the trailer is a dual axle rated to 2000kg GVM each axle is rated only for 1000kg I found out. These axles are not fitted onto (what I have learned now) a load sharing spring system. so when you come off an uneven surface or back up a hill etc a pair of wheels can "freewheel" and spin, all the weight goes onto the remaining single axle .... so in effect you could have 2000kg onto a 1000kg axle .... AND THESE CLOWNS BUILT IT LIKE THAT.

One trailer place told me it was common, and they break there due to metal fatigue and it's where there's a step in the shaft from machining and where the bearing pressures are, especially when turning as there's lots of screwing pressure on the rear wheels.

A load sharing spring system keeps both wheels in contact with the ground, but that is not what I have.

The axle was not bent, there was no load. I often have my Kanga on it too, just as well I didn't today, but what about tomorrow?

I will write to the manufacturer about this lethal situation, and pending their answer may pursue the matter further. A wheel snapping off at 100kmh hitting another oncoming car doing the same speed means a 200kmh impact, and likely an out of control car towing the trailer, all because some fools poor design.

On their website they think they are the future of box trailers, plenty of pats on the back for their greatness, will they acknowledge this flaw?



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axle snapped on tandem trailer| trailers2000| BEWARE-trailer-axle-1.jpg   axle snapped on tandem trailer| trailers2000| BEWARE-trailer-axle-2.jpg  
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Old 16th July 2010, 03:34 PM   #2
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

This is an unfortunate thing to happen and quite lucky it happened when it did, for all of your above reasons. May have meant a days work shot but all parties affected are safe.

As far as the problem you have with your trailer this is quite a common way of setting up the axel's mainly because its cheaper and the customers they are aimed at usually have static loads and don't often jump kerb and guttering. in most cases when i have bought or made trailers the dealer or parts supplier will or should ask what your intended purpose for the trailer is as there are axle setups that are better suited for the types of things we as arbosists and most other contractors ask our trailers to do.

A common way to overcome the problem you now have being that I assume you are happy with the body would either be to do a relatively quick suspension package changeover the double rocker style will transfer weight evenly but the can be quite costly or you can get a larger capacity axle say 2000kg rated capacity on each axle but still limit your loads to a total of 2000kg.

Hope it all goes well it always a pain when something breaks.
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Old 16th July 2010, 04:14 PM   #3
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

That sounds so dangerous! I hardly use our trailer but sometimes I have to like the other week when we bought a new washing machine and I had to take the old one to the scrap metal merchant.

I'd have a heart attack if that happened to me.
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Old 16th July 2010, 06:31 PM   #4
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Reminds me of the time I saw a ute ripping a SINGLE axle around a corner. One of the wheels snapped off and bounced into the traffic, but the idiot towing it kept on going.

In your case Ekka, the fact that the axle snapped in such a lightly loaded situation could mean a defect in the steel and/or that the axle was already half sheared through before you got there. Notices the grease stains on the face of the shear point. All in all the trailer is definitely defective by design and the manufacturers are balancing cost cutting with the trailer mostly being on flat ground. Best setup I ever saw was separate coil spring suspension for each wheel with gas shockers on an angle to balance the side sway of the trailer. Must of cost a fortune, but it bloody looked fantastic.

Worst thing is even if you put another axle in or even the load sharing system, the trailer will never feel secure.
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Old 17th July 2010, 05:24 PM   #5
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

The grease marks were from my finger. It was a clean snap.

Backing up or down driveways also will mean free wheeling.

The body design is good but there's other issues with the trailer.

These geniuses do not put drain holes in the box sections and there is rust so it might be a right off or replace the chasis under floor.

The corners of the trailer have pull up poles, the drain holes in there I drilled as they filled with water and rusted like buggery, when I pulled the poles up they were heavily rusted.... that was like 1 week after new.

By virtue, all users will at some stage only have one axle bearing the load, so as far as I am concerned it is not an option to have a 2000kg rated trailer with axles of such configuration.

The practicality of it, how the door works, poles pull up, drawbat etc is all great .... pity they buggered this part up.

Also checking the tyres on it not they are only rated 670kg each too, so another illegal overloading issue.
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Old 18th July 2010, 12:50 AM   #6
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

I know it costs a fortune, but hot dip galvanising is worth it when u get a new trailer. Either that or powder-coat or at the least a cold galv undercoat.

It sounds like you really like the general setup of the old one though. Have you priced getting a trailer place to weld in a new floor etc, redo the undercarriage to your specs and put a new finish on it?


If you get a new one though make sure you post the pics to make us all jealous.
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Old 24th July 2010, 08:53 PM   #7
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

did you change tyre width , makes a huge difference on tandem axles
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Old 24th July 2010, 09:45 PM   #8
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Nope, same as the ones that were on there.

Tyre shops are pretty specific these days.

Fact remains, 2000kg trailer is poorly designed so the load (at times) can be carried on one axle only.

Many newer estates have driveways which come off the angled kerbs, I may even shoot a video to demonstrate the difference.
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Old 22nd December 2010, 07:59 AM   #9
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

I'm having a replacement built, nice and strong, load sharing axles, better springs, galv dipped. Being built by Trailerworld who certainly have a clue how to build a trailer.



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Old 22nd December 2010, 09:34 AM   #10
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

nice build, tipper - what is the means of opperation (under body hyd or other? etc)

i also like how the rear gate hinges wide too.
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Old 22nd December 2010, 11:33 AM   #11
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Looking good The best part about building a trailer from scratch is you are the creator ! you can tweak it up as much as you can aford... a gusset here and there, a couple of lenght of flat bar under your draw bar rio it to buggery... it goes on N on..
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Old 22nd December 2010, 11:42 AM   #12
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

No tipping, just a smooth one piece floor.

Also made the sides 30cm shorter so I can load over the sides with the Kanga.

Upper cage corners has extendable poles that come up, it's where I load palm fronds, and very strong, in the past I have unloaded in excess of 250Kg of fronds .... logs of course are cut perfectly to go into the trailer and roll out.
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Old 31st December 2010, 04:46 PM   #13
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Hey,
I thought I would give you this link for a tipper conversion..
Hydraulics I think this quite reasonable for the hydraulics... remember you are the creator..
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Old 31st December 2010, 04:52 PM   #14
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Being that it broke where it did, my first thought is that when the axle was machined, they used a small nose radius tool that scored a line around the axle at the start of the taper. A scored line will focus stress to a fracture point. With a larger nose radius tool or a programmed smooth radius on a cnc, you spread the stress over a larger area. Another item is the type of steel, the hardening, and the drawing back of the metal. An error in any of these would make it prone to breaking.
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Old 31st December 2010, 04:57 PM   #15
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Quote:
Originally Posted by gooddog View Post
Being that it broke where it did, my first thought is that when the axle was machined, they used a small nose radius tool that scored a line around the axle at the start of the taper. A scored line will focus stress to a fracture point. With a larger nose radius tool or a programmed smooth radius on a cnc, you spread the stress over a larger area. Another item is the type of steel, the hardening, and the drawing back of the metal. An error in any of these would make it prone to breaking.
I think it had a lot to do with an improperly designed axle set up putting stresses far beyond what it was designed for. In saying this, All factors go together in making a component fail in service all playing their role in a catastrophic failure, in this case Eric was just lucky no one was injured.imo.

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Old 5th January 2011, 12:47 PM   #16
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

I have a mate with similar problem where on a tandem trailer with slipper springs had a axle shear off. He quoted the National standards claiming that the vin plate said his trailer was 2 tonne aggregate weight. The standard says

"...... that the load carrying capacity of each axle in the group and the wheels and tyres fitted to it is:

-- at least 120% of the load on that axle with the trailer at its ATM: and
-- at least equal to the load on that axle with the trailer at its ATM and any retractable axle retracted"

The trailer manufacturer ended up putting on a $550 load sharing kit for free and changed the design of their trailers
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Old 5th January 2011, 07:19 PM   #17
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

I have a set of 1500kg axles on my tandem trailer. Althought they dont give a full 2T capacity they were cheaper than getting a load balancing axle kit (By about $300 Aussie bucks)
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Old 6th January 2011, 07:14 AM   #18
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Quote:
Originally Posted by MrDiesel View Post
He quoted the National standards claiming that the vin plate said his trailer was 2 tonne aggregate weight. The standard says

"...... that the load carrying capacity of each axle in the group and the wheels and tyres fitted to it is:

-- at least 120% of the load on that axle with the trailer at its ATM: and
-- at least equal to the load on that axle with the trailer at its ATM and any retractable axle retracted"
Interesting, so the 2000kg load goes onto 2 axles, making it 1000kg each. So the axle has to be rated 1200Kg and tyres 600kg minimum.

And if the designer does this and the trailer is loaded to 200kg and you come off a gutter or steep driveway etc and 2000kg goes onto that one axle it will be overloaded by 800kg or 66%

My new trailer has 1500kg axles in addition to load sharing.
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Old 26th January 2011, 08:14 AM   #19
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

I found the PDF to the National Standards and attached it.
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File Type: pdf roads_vsb_01.pdf (404.6 KB, 31 views)
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Old 26th January 2011, 08:50 AM   #20
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

What sort of coupling are you going for? I replaced mine with an AT35 (used with camper trailers) are it has a higher rated load limit. I also put electric brakes on the front axle to stop the shudder of a mechanical brake if you need to hit the anchors suddenly
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Old 5th February 2011, 09:35 AM   #21
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Here's the new one, galved.



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Old 5th February 2011, 09:41 AM   #22
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Looks great.. all it needs now is some sign writing.
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Old 6th February 2011, 08:05 AM   #23
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Looks good, i like the rear tailgate hinge strong and in a useful position. Is there a way of locking it to the side of the trailer when its fully open?
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Old 6th February 2011, 08:21 AM   #24
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Yeah, an okky strap.
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Old 6th February 2011, 05:30 PM   #25
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Default Re: axle snapped on tandem trailer| trailers2000| BEWARE

Quote:
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Yeah, an okky strap.
Its the Aussie way! Okkys hold my ute together
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