1) Many dump trucks do not use scissors hoist. They use a telescoping cylinder standing upright with a dog house built around it that hooks to the floor/bed frame to lift the bed. Just a heads up. The telescoping cylinder actually is simpler in operation. You just would have the dog house sticking up inside your bed.
2) Frame rail width. The truck frame and bed frame both would be 34" wide. This is the standard truck frame width. This works great for dual wheeled axles. For regular single wheel trailer axles it is way narrower than common. I know you can order your 7000 axles any width you want but with the dump box you want as wide of wheel base as you can easily get. It makes it more stable when dumping.
3) Most dump truck hydraulic pumps are transmission driven. They usually turn around 1000 RPM. I don't know if your planning to use a gas motor driven system. Power it with just your tractor hydraulics ( the oil capacity of most tractors is not enough for a telescoping cylinder the size used in most dump trucks) Most factory pickup pulled dump beds use electric driven hydraulic pumps to lift.
All of this means there may not be as many useable parts as you think on the used dump truck. It all depends on what/how your planning to use it.
P.S. I have done what your thinking of doing. Kind of. LOL I have two that we built just to pull with larger tractors. So basically we just removed everything forward of the bed on the frame. We then just cut the frame and angled it in to a clevis hitch. The first one I ran the dump truck hydraulic pump with a PTO shaft from the tractor. The second one had a smaller scissors hoist so I just plumbed it to run off the tractor hydraulics. We almost never pull either of them with any tractor under a 150 HP. So these tractors have the hydraulic oil capacity to dump the single acting cylinder.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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