Axel over springs

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Axel over springs

Postby Tukanu » Tue Oct 29, 2019 9:22 am

I realize this question has been asked a thousand times, but I am looking for opinions about my specific suspension.

My frame seems to be fairly light…no more so than a HF 4x8. I would guess it is about 200# because I can lift a corner. The welder estimated the capacity at 1,200 lbs. There are two leafs. There is 4 ½” of travel up to the frame. 3/8” U-bolts hold the axel in place. There is a post on the axel that mates with the hole in the spring. With the weight of the sidewalls and floor in place, there is no movement in the springs…even when I stand over the axel and jump up and down.

The build, so far, also seems to be light. I am sure it will be between 600# 700# (with chassis) when complete. Add a hundred lbs when fully loaded, and I would still be under 800#.

I have attached a couple of pictures of my axel and spring.

The bottom of the sidewalls is 19” off the ground. Flipping the axel would drop the body a few inches, but would reduce the travel to the fame down to about 2”.
Here are my options:
1. Do nothing and live with the high clearance.
2. Flip it and hope the u-bolts don’t snap.
3. Beef up the u-bolts and plate.
4. Finish the built and duck-tape a raw egg above the axel to see if there is enough travel to smash the egg .
Attachments
DSCF0350.JPG
DSCF0350.JPG (27.71 KiB) Viewed 516 times
Springs.JPG
Springs.JPG (26.25 KiB) Viewed 516 times
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Re: Axel over springs

Postby Atomic77 » Tue Oct 29, 2019 9:42 am

Our builds are completely different, yet I remember being in a similar quandary during my build. I felt like the springs were very stiff and sat too high. As it turned out, by the time it was finished and loaded for a trip, I actually needed the 'extra' hight that was actually perfect in the end.

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Re: Axel over springs

Postby twisted lines » Tue Oct 29, 2019 12:11 pm

I flipped mine but I also have shackles and different springs with eyes on both ends that may give you a in between height but another hassle and added expense :thinking:
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Re: Axel over springs

Postby MickinOz » Sat Nov 16, 2019 6:41 pm

I guess I'm a bit late for this, but I'd like to make a couple observations.
1) Those u-bolts stand out when I look at them, because they are square u-bolts on a round axle. Here in Oz that wouldn't be acceptable, a round axle would require round u-bolts. Dunno if I'm using the right technical terms, but the u-bolt should wrap around the axle, taking the load in tension.
2) It seems much more common here in Oz to see the axle sitting on top the spring, with the u-bolts taking full weight.
3) When I googled the part number of my springs, I learned on the ALKO website that the spring rating is two times the weight that causes 2 inches of deflection in a single spring.
e.g I have a pair of 600kg springs. This means that each spring will deflect 2 inches with 300kg on it.

If the manufacturer of those springs rates them the same way ALKO does, then room for 2 inches of movement would satisfy me.

P.S. have a careful look at your fishplates. Do my eyes deceive me, or are they bending?

I tighten my u-bolts in accordance with this:
https://www.alko.com.au/wp-content/uplo ... ations.pdf
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Re: Axel over springs

Postby Tukanu » Mon Nov 18, 2019 6:45 pm

Mick,
Thanks for the response.
I think you are right. round bolts make more sense on a round axel. I'll take a closer look at those plates to see if they are bent. This is a very narrow trailer, and I am concerned about it siting so high off the ground. An unexpected cross wind while traveling concerns me.

It is curious that you almost never see an axel under the spring.

This is going to be a light trailer, and I'm leaning toward switching the axel over the spring.
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Re: Axel over springs

Postby Sparksalot » Mon Nov 18, 2019 7:54 pm

I’d be tempted to build it out and see what travel is left before you make the final decision. Be sure to consider your fender mounting method as part of that.

I did the axle flip after about 8 years. I had to notch the spring perches to get any travel. The perches, not the frame. The flip dropped Rose 4 inches overall, so the fenders definitely had to be remounted.

Btw, Rose comes in about 1,500# when loaded.
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Re: Axel over springs

Postby Tukanu » Mon Nov 18, 2019 8:12 pm

Sparky,
You have mentioned that before. It makes a lot of sense. I need to practice restraint.
David
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Re: Axel over springs

Postby Tukanu » Mon Nov 18, 2019 8:18 pm

P.S. have a careful look at your fishplates. Do my eyes deceive me, or are they bending?


Just an illusion…the plates are perfectly flat.
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