I wanna do somthin that I've never seen done before and that just makes me wanna do it even more. I got a 40' triple axle flatbed trailer that I wann put a removable dump bed on. It's a 32' platform right now but I am only gonna put a 15-20 dump bed on it so that it sits over the trailer axles. I DON"T KNOW ANYTHING ABOUT HYDRAULICS, let me make that clear right off the bat.

How can I go about making a self contained unit that includes the hoist, bed, fluid holding tank, pump and pump motor all in one removable unit. I wanna be able to back the trailer under it, fasten a few pins and drive away.

Heres a test of your ingenuity. I can build anything I need on a trailer but I need some dump experiance here. Photo's to if you got em. and no big rush, this is a long term plan.

 

Yaknow this comes full circle.......I used to have a 16' self contained dump trailer..................it had 3 foot sides and loaded with dirt it was a hellofaload.........my first recommendations is to downscale a bit there big rigger heheheheh

the trailer had two seperate fromes...one on top the other and a big *** hydrolic cylender between.........I would say to go out and find an old dump truck and all yer parts are there.................it had a 20 gallon storage tank for oil and a small 12volt motor with a pump on it .....pretty simple

by the way it was a gooseneck.............you dont want to do this on a bumper pull

 

This is a Gooseneck that I already have. I'm hopin for one trailer to do it all with. Cost me almost $200 a year to plate this one. When I built this trailer I was originally plannin to amke it a dump bed, until I really started lookin into it. With this long a bed the 2nd frame was gonna add a massive amount of weight to it and it was gonna take 10 cylinders to lift any amount of weight. So I decided against that idea. I built this trailer with all 8" I beam fro the frame and neck, no chincy little H beam stuff here. I built this to carry any amount of weight I could fit on it. All the neck welds are plated inside and outside woth 3/8 flat plate so every joint in the neck is 3 layers thick and the axles are mounted further forward then usuall so the trailer carries the bulk of the weight. When you buy a trailer the manufacturer takes shortcuts to speed up production, aint no shortcuts on this thing. Every joint is reinforced. This trailer will carry as much as any two of my trucks will pull.

So in the end, I'm not worried about the extra weight since this bed will be removable and not used for cross country hauls. Just lookin for somethin to haul dirt and rock in.

 

Something I might recommend: the dump truck hydraulics (commercial) are going to be way over kill, usually consisting of a PTO driven pump.

If you have ever seen a lowrider with hydraulics the system they use is fairly simple and self contained, start there.

Contact your local hydraulics shop about parts and fittings, they may even have a kit for such a thing.

 

I saw a Big Tex brand dump trailer a few years ago that they had mounted a 6 or 7 HP lawn mower engine to for the power to. Would be great if theire was an electric motor you could run off the light plug.

 

OK lets do some simple math here

lets say the trailer bed is 40x7 and you stack dirt up 1 foot deep......thats 280 sq ft of dirt and there is 27 cu yd in a yard so you have just over 10 yards of dirt and it weighs in at 2500 lbs a yard if its fairly dry.......thats 25,000 lbs

see where I am goin here .......alot of weight dude

it sounds like yer built well though

 

Damn Whit, when you get yourself edemacated like that. I'm impressed.

I know it would be heavy, that's why I'm only lookin to make the back 15-20 feet of it as the dump, this would also keep the extra weight over the trailer axles.

 

Whitmore is far more educated than me but here's my experience.

I rented a hydraulic dump trailer, bumper pull. It was rated at 10,000# worth of capacity beyond what the trailer itself weighed.

I got one load of gravel, the trailer was not even full. I Grossed 21,500 pulling off the scales. Truck weighs 7600 with me in it, trailer weighed roughly 3500#. Being the trailer is a rental the tires were squashed out beyond belief as they were not taken care of very well at all!

Your trailer is probably 6000# (add another 2000# for hydraulics and dump bed). Any truck that will pull that kind of trailer is going to be 7000# +. I wouldn't even think of wasting my time building a dump for that trailer, only to haul 2 shovel fulls of dirt.

my .02
Curtis

 

Your right on the money for legal stuff there. But on the other hand. I'm wanting it to be a removable dump bed cause I know it wouldn't be worth it to have a trailer like this with a full time dump due to weight. For the short distances I'm not all that concerned with legal weight limit's, not to be a law breaker or to justify it here. But this trailer is primarily for ag use at slower speeds. For the road hauls the dump bed would be removed and all would be within specs again. This trailer is plated to 21,000 and I have weighed it at just a few pounds shy of 30,000 combined weight of trailer and load in the past.

 

60/40 rule.....60% needs to be forward of the axle centerline in order to make it handle right...I know you said you had the axles mounted more forward than normal..somepin to thinks on