boom pole

[schweizer]

J.J. is correct. Laws of physics tell you that the weight a boom pole can lift is proportional to the distance from the fulcrum. Your tractor acts as the counter weight. If your tractor is 1000 lbs and it's center of gravity is "x" inches forward of the 3 pt fulcrum then you can calculate how much weight you can put on the 3 pt arms before the tractor tips over backwards. The hard part is figuring out where the center of gravity is.

At any rate, don't lift a 500 lb engine with a 1000 lb tractor with a boom pole without counter weights, and your 3pt won't handle that weight anyway.

How did I end up at a thread that is several days old? I'm designing a boom pole for my DK45SE to lift several 6x12 beams that are 12-16' long about 15' high. My FEL w/ forks will only lift about 9' high. The FEL lift capacity to full height at pivot pins is 2,761 lbs. The number I'm really interested in is the curl capacity of the bucket at "x" distance from the pivot pins. Then I could calculate the lift capacity of a 12' or 16' boom pole. Anybody have an answer? My guess is that it should easily lift a <200 lb beam.

For reference: my tractor is about 4000 lbs w/ ballast in the tires (+700 lbs x 2) + backhoe (~700 lbs).

The boom pole would be a 4x4" sandwiched with lumber between the forks, and lifting mechanism would be 2 cables from the end of the boom to the ends of round bar stock (see pic of forks).

Marcus

 

[bigdad]

Keep in mind the 3pt arms will often support more weight than they can lift.

so its possible to lift the empty boom pole to max height then attach a cable come-a-long to the end (or middle) to lift the engine.

All the other comments about needing additional weight at the front still stand.

That's the way I have mine set up. A little more versatile.

 

[Dick]

careful not to exceed max 3 point capability of your tractor. Adding more counterweight to the front may give you a false sense of security. Just because the front end doesn't come off the ground doesn't mean that you have exceeded the capability of your tractor.