What do I look for on the pump(markings) to make sure it could handle a larger cylinder?
Dump trailer doesn't have enough power
- Thread starter retNAVY
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You could be correct,you've got me guessing now...here are some of the specs ..
6″x10′ BLACK Griffin Deck Over Dump Trailer
7,000#lbs GVWR (Gross)
3,500#lbs GAWR (AXle)double axle
2,000#lbs Curb Weight
5,000#lbs Payload
LD1
Epic Contributor
The pump dont care what size cylinder it is hooked to. Its gonna make a given PSI and thats it. Larger cylinder has greater piston area.
If your pump makes 3000PSI and you have a 4" cylinder.....the area of that cylinder is 12.56 square inches. So a 4" cylinder bore could generate a force of 37680 pounds.
Going to a 4.5" cylinder has 15.9 square inches. Same 3000psi pump could make the cylinder push with a force of 47,689 pounds.
And a 5" cylinder would be 58,875 pounds of foce.
The only thing regarding the pump is that it holds enough oil to account for the bigger cylinder without running dry.
But even a small increase in cylinder size is a huge increase in cylinder force. But due to the angle.....only a small part of that force is trying to lift the dump trailer. A much greater portion of that force has to be absorbed by the trailer frame. So make sure the trailer can actually handle the added stress
Rustyiron
Super Member
The best, most reliable dump trailer that I've ever used had a small Honda and a 2 stage log splitter pump.
I don't know why this isn't an available upgrade. It may be, I gave up on dump trailers a long time ago and haven't shopped them.
4570Man
Super Star Member
- Joined
- Apr 7, 2015
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- 18,286
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- Crossville, TN
- Tractor
- Kubota M59, Kubota L3800, Grasshopper 428D, Topkick dump truck, 3500 dump truck, 10 ton trailer, more lighter trailers.
If I was actually trying to do work with mine I would Honda swap it. As it is now I use my dump truck for heavy loads.
davedj1
Veteran Member
Well said!
Here is what I did on the one with the 5" cylinder, first it was a double acting cylinder but a power up, gravity down pump so I welded a bung into the reservoir of the pump and ran a hose to the top port on the cylinder. After cycling it a few times and adding transmission fluid the unused part of the cylinder became part of the reservoir thereby not needing a huge tank. As the pump pushed the cylinder up, the fluid would get pushed out the top port and back into the tank, when going down the fluid went from the bottom port to the tank and the top port siphoned the fluid out of the tank to the cylinder, worked great. On my dump truck I decided to go with power up and power down. I love it so far. Gravity down can be real sloooooow in sub-zero weather even using ATF.
Edit to add: DC Power Units | Hydraulic Power Units | Hydraulics | www.surpluscenter.com
power packs come in different volumes also, more gpm's equals faster times. Of course the larger the cylinder the slower it will be too.
LD1
Epic Contributor
Yep. A true single acting cylinder needs a pretty big reservoir. Bigger than most little 12v power units have.
A typical scissor lift is something like a 5.5x20 cylinder. Cylinder alone takes 2 gallon of fluid.
Even my little suretrac with I think a pair of 3" x 24" cylinders takes a gallon and a half.
Thats the single biggest reason most dump trailers are power down. Not because they need to be power down. But it requires less fluid. Instead of having to fill the entire cylinder with oil....you only have to make-up for the volume of the rod leaving the cylinder.
In my case, 1.5" rods x 24" stroke. So the pair of them....to fully extend, now only requires a reserve of about a quart and a half instead of a gallon and a half.
And the above example with a 5x5x20 cylinder.....assuming it had a huge 2.5" rod....would only need to account for just shy of 2 quarts of oil. Which is about all most of them little power units hold
If the payload is 5K it should dump 5K. Have you checked the pump to ensure it is hooked up correctly? Mine really fooled the dealer. He could get it to dump with it empty, and it would raise a less than full load, but as soon as I put a real load on it it would not raise.
CADplans
Elite Member
My trailer is 6.5 feetX10 feet,, you can estimate the height,,
I can dump my trailer when it is level full to the top of the boards with freshly dug creek stone/sand.
I know when it is full,, it is ALL that my 3/4 ton Chevy with 4.10 axle will pull up a pretty steep local road.
Yes, I know I was overloaded,, but, it was a VERY local haul, well under 10 miles.
I can dump my trailer when it is level full to the top of the boards with freshly dug creek stone/sand.
I know when it is full,, it is ALL that my 3/4 ton Chevy with 4.10 axle will pull up a pretty steep local road.
Yes, I know I was overloaded,, but, it was a VERY local haul, well under 10 miles.
CADplans
Elite Member
Hey, retNAVY,, where do you live? (what state?)
I too was certified to weld pressure hull when I was in the US Navy,, C1 welding school.
But, that was never needed to keep the destroyer running that I was on LOL!!
I sure did burn a LOT of rod in welding school,, WOW!!
I too was certified to weld pressure hull when I was in the US Navy,, C1 welding school.
But, that was never needed to keep the destroyer running that I was on LOL!!
I sure did burn a LOT of rod in welding school,, WOW!!