3pt vs fel lift

[daTeacha]

Yeah, that's what I was refering to as the levers making up the rest of the system. It just seemed that everyone was forgetting that different cylinders connected to the same pump can exert different amounts of push even though the pressure is the same. If you have the physical room, you could put bigger cylinders on a FEL to lift more, but it could cause damage to the arms or something even though the relief valve doesn't open. If it didn't do that you could end up lifting way too much weight too high and tipping over more often than you'd like.

 

[Soundguy]

Bob is correct. A cyl attached directly to a fel bucket mayl have more force, but less range of motion as compaired to a cylinder attached to a lever attached to the bucket. depending on how the lever is attached. for instance, if the lever is attached so that the bucket swings farther and faster.. thent he force will be dminished. if the lever is attached whre the bucket has a lower range of motion.. less swing.. thent he force will be increased.

Soundguy

Rich, in addition to what you wrote, there is also the issue of mechanical advantage that can be added to your list. Realize that HOW and WHERE the hydraulic cylinders are attached to any given thing will also affect capacity. Think in terms of a child's see-saw on a playground. Two equal weights and the see-saw is level. However if you lengthen one side you gain mechanical advantage and that side now requires less weight to hold up a heavier weight on the opposite, shorter side. So there is some margin that must be factored in for the engineers who design the systems because they will typically utilize mechanical advantage when they are able.

 

[pat32rf]

I am forever trying to move big rocks for my wife's flower beds. Some I can do with the FEL of my JD4300. Most I only have to lift off the ground, not 58" in the air. I have a set of forks that I can put on the 3pth, back into the rocks and lift. I know deep in my heart that the rear axle will support more weight than the front and the tires won't sink as deep into the lawn. Once they are back on the ground about where she wants them I use the FEL to do the final positioning.

 

[kossetx]

Pat, the axle point was a good one. I'm assuming though that the front axle will support the weight the fel is supposed to lift.

I'm building a tree grubber. I would liked to have built one for the fel with multiple teeth like some others have shown here. I decided against it until I get a qa fel bucket though.

What I am going to do is use a middle buster frame to make a puller for the 3pt. My Howse MB frame uses a 3/4"x 6"X 28" "shaft" for the middle buster. I got a hold of some 3/4X8X36" plate which I'm going to change out with the frame of the MB. It simply bolts to the frame with 2 7/8" bolts so I can change them out. I'm trying to determine how long to make the shaft out of this 36" piece. I'm thinking 18" should be more than enough for the shaft. If I cut the 36" onto 2 18" pieces, I could use the other 18" piece to make the tooth/teeth out of. I'm thinking the lower to the ground I make the grubber the better it will pull. A longer shaft would help keep the tree from falling on me, but I'm only going to pull 1-3" trees so I don't really see that as a problem. I'm still up in the air on whether to make 1 V shaped tooth or multiple teeth. It will mostly depend on how long I make the shaft.

Anyone have any thoughs on this?