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Hydraulic 3pt boom/crane questions

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Ralph Bauer

Well-known Member
This shop made 3pt boom/crane with hydraulic cylinder followed me home for a few $$ last Saturday (Kiowa County spring auction, Lone Wolf, OK). Was a "left-over" from the prior year, never got picked up. Have to replace the rod and will put a seal kit in. My questions: would it not be better if the piston would be under the joint, opposite where it is now? Should I go with a bigger cylinder to increase max pick-up load? Current one is ~22"x4", rod is 1 3/4" wide, unsure of its length.
What might be the max load "as is" (rebuilt)? Thanks in advance, Ralph.
PS: Plan on putting it on my 5010, can add up to ~800lbs in front weights, rears are empty 24.5-38s with inside cast weights, 2 outside casts as needed, so it should be an okay tractor for jobs I have been doing with my GB800 on a 4020. Hoping for same or more max capacity to lift/load/unload items onto/from trailers (GN and smaller).
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Ralph, I wouldn't lift much with that thing unless you modify it the way you're thinking. What scares me about it is the fact that a 5010 has a rather powerful hitch, and could pick up more than that crane's hydraulic system could withstand. Consider this: If the cylinder were all the way retracted, it would be at it's lowest mechanical advantage. This means if you try to pick a un-movable object by raising the 3-point, you could far exceed the pressure any of those hydraulic components,including those on your 5010, could possibly contain. Unless a 5010 has line reliefs, I would guess the 5010 hitch could multiply the remote pressure to around 10,000 PSI with that rig. However, I think it would be safe with the cylinder on the inside. More mech. advantage, and the lift pressure on the big end of the cylinder.
 
That cylinder sucking in can pull about 8000 lbs if tractor hydraulic pressure is 2000 lbs.

If the boom is 6 ft long you will loose about 3/4ths of the lift cause of the type of leverage design on the that boom.So it may lift a ton the way it is. But I doubt it.

If you move the cylinder to the other side of the pivot point and push up on the lever the cylinder can produce about 12000 lbs of lift with 2000lbs of hydraulic pressure. Then subtracting for leverage you might lift 5000 lbs or so if you attach the cylinder about 2 to 3 feet from the pivot point.

I am not an engineer just a farmer engineer so your proformace may vary. I give no guarantees.

5000 lbs may also be about all you want on that boom without failure occuring.

Gary
 
I was going to tell you , what Gary told you till I saw Gary's post. I think he covered it all quite well. Do take his suggestion, of moving the pivot point at least 2 ft, out on the boom, it not only will increase the ability to pick up a heavier load, but also works like a gusset, to keep the boom square tubing from bending. I also am not an engineer, but have 30 yr's as a material handling, and crane tech. Wish I had that rig!
 
Ralph, I would sell it to you, but it's a looong way from my to your door, Ok to WI. Once I got it figured out and corrected, be glad to put the tape measure to the metal and sent you the specs....
Ralph in OK.
 
If I move the cylinder about 2-3 feet from the pivot point on either piece, I might want to upgrade to a longer cylinder, so the crane will be "more straight" when cylinder is extended, right????
Thanks, Ralph.
 
Ralph! It is a little farther between us than you thought! I am on the west coast, about 15 miles from Olympia Washington. I was trying to save you from buying a new cylinder, being as they are a little spendy. That will depend on how far up you want the boom, after going past 90 deg. the cylinder base can also be moved up the mast, to make it work.
 
I dounbt a bigger cylinder would do anything but bend the vertical mast.

I'd be surprised if that thing was rated for more than 1000# in the closest hole, and 500# in the farthest hole. With no bracing on that rather long vertical mast of rather thin tubing, there just isn't much strength there.

As well, most tractors with cat 1 hitches - I assume it is cat 1 - really wouldn't be able to lift much more back that far anyhow.

I usually agree with Iagary, but it looks a lot lighter built to me than he suggests. I suppose there is a way to prove one of us wrong, and most of us farmer types would go ahead & prove it sometime. :)

--->Paul
 
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