Lift Capacity Help Needed!!!

[pikonpunch]

I am currently running into a little concern on a piece of equipment I am building. I have a tractor that has a lift capacity of 8900lbs at the pin holes. I am building a piece of equipment that weighs around 3400lbs but is 6 feet long off the back of the tractor. I am concerned with the length the tractor might not be able to lift it. Any physic gurus out there that can solve for this mathematically? The tractor weighs around 14k if that makes any difference. Thank you very much!!!

 

[IXLR8]

How is the weight distributed along the 6 ft. If the majority of the weight is 5-6 ft out, I suspect it is not going to lift it. If the majority is 0-3 ft out, I suspect it will lift it. In between... I have no idea.

 

[Baby Grand]

IXLR8 has the right idea - it's the distance from the lift pins to the CG that's important to lift capacity, not the implement overall length.
See if you manual lists two lift capacities - one at the pins and one 2 ft from the pins?
This would give you an idea of how much the capacity drops for every foot that the CG moves aft of the pins.

 

[pikonpunch]

The weight is pretty evenly balanced front to back. So I have no clue what is going to happen. I guess if it's evenly balanced then from the pins to cg theoretically the cg should be roughly 3'?

 

[deerseeker001]

Welcome from Wisconsin

 

[murphy1244]

welcome to you too Ron.

 

[ishiboo]

Torque is pretty simple - distance * force (weight). There's a good explanation of how it works and how to calculate it in this post.

3400 lbs is going to be close for the total lift capacity, but if that's an implement you are hauling around in the air it's going to be not the best idea. Usually an implement that long will bounce as it travels, which can introduce a lot more force than just its weight.

 

[94BULLITT]

I am just guessing but I think it will lift it without a problem.

 

[pikonpunch]

Thank you very much for showing me that previous link. I am still having trouble following the arithmetic. Are some of those numbers listed constants? The implement is a cultivator so it basically spends most of its time down rolling on its depth wheels, it is just when its time to turn around it needs to be lifted. Its not the total weight that worries me because I know the tractor has picked up heavier its just how long this implement is going to be really changes things.