3PT Life Capacity Question

[J_J]

Deere rates capacity 24" aft of the hitch pins, J_J

Sometimes Kubota quotes both weight limits.

 

[Transit]

From the Ops question he knows little about calculating leverage forces, however he has a gut feeling that as the lever arm is longer the lifting capacity is reduced.

What do we know about the problem?

The hitch can lift 2,200 # on a lever arm of 24 inches, and nothing more. We have no information about the dimensions of the parallelogram.

We know nothing about how long of a lever arm the OP intends to use.

While technically correct, there are too many unknowns to solve the problem using a parallelogram.

I chose the best fit, a class 3 levers that will give an estimate of the load that can be lifted.

With all the chit-chat flying about we have no response from ericrm2005 if my solution is acceptable to him.

 

[SPYDERLK]

From the Ops question he knows little about calculating leverage forces, however he has a gut feeling that as the lever arm is longer the lifting capacity is reduced.

What do we know about the problem?

The hitch can lift 2,200 # on a lever arm of 24 inches, and nothing more. We have no information about the dimensions of the parallelogram.

We know nothing about how long of a lever arm the OP intends to use.

While technically correct, there are too many unknowns to solve the problem using a parallelogram.

I chose the best fit, a class 3 levers that will give an estimate of the load that can be lifted.

With all the chit-chat flying about we have no response from ericrm2005 if my solution is acceptable to him.

The levers end at the eyes. The eyes cause articulation of a "4bar linkage". From this articulation point a pseudo //ogram governs the drop in available lift force. If the //ogram were perfect there would be no lessening of force with distance beyond the eyes. Trying to force this system analysis using simple leverage will yield a significant underestimate of lift ability.
larry

 

[LD1]

The levers end at the eyes. The eyes cause articulation of a "4bar linkage". From this articulation point a pseudo //ogram governs the drop in available lift force. If the //ogram were perfect there would be no lessening of force with distance beyond the eyes. Trying to force this system analysis using simple leverage will yield a significant underestimate of lift ability.
larry

Larry is correct here.

Hey Larry, Have we been down this road before?:laughing:

A perfect parallelogram would result in NO loss of lift capacity. Keeping the front end down is another thing alltogether. A perfect //ogram will make the implemet raise perfectly level. In order to achieve this, to toplink HAS to be the same length and on the same angle as the lower links.

In reality, this is usually not the case. The TL is usually a little shorter and on a downward angle toward the tractor (gets closer to the lower links the closer you get to the tractor).

This will result in a slight dedcution. On the other hand, if the TL were longer and on an uphill angle (gets closer to the lower links as you move toward the implement), this causes the back of the implement to raise LESS than the front. This would result in a slight increase.

If your tractor has multiple places to mount the TL, the highest point will get the most lift. The lowest will cause the tail of the implement to raise higher and give a lower capacity.

TO the OP: What tractor are you working with that has a 2100lb capacity.

According to deeres website, the 5065e that you say you plan on buying lists TWO capacities @ 24". One is ~3100lbs, the other ~3500lbs. Either way should be more than enough for your 2200lb disk.

 

[ericrm2005]

thanks for all the posts, tractordata.com has it listed at 2200lbs. that must not be correct. 3500 would eliminate the concerns i had

 

[jenkinsph]

thanks for all the posts, tractordata.com has it listed at 2200lbs. that must not be correct. 3500 would eliminate the concerns i had

I was just fixing to check the specs myself as the 2200lb capacity seemed very low to me. The 4x20 series are about 2500 lbs 24" out from link ends.

 

[ericrm2005]

I was just fixing to check the specs myself as the 2200lb capacity seemed very low to me. The 4x20 series are about 2500 lbs 24" out from link ends.

tractordata.com as well as some others online list it at 2200. I did think that seemed low, but upon checking the deere sight I see that its above 3,000. I guess for future reference, I will not use any spects posted on that site.

 

[jenkinsph]

The smaller 4105 model is rated at 2200lbs @24" behind link ends IIRC.

Tractor Data is usually correct in their defense and if notified will correct this error. I would still use them for a reference. When and if serious about buying a specific Deere or other brand I would certainly check the factory specs and make sure things like rear hydraulic outlets are available with my dealer.

 

[ericrm2005]

I agree, I will be checking with the dealers and getting all the specs from them when I get down the road. I am just in the very early stages right now and will be getting into a dealer most likely mid summer to do some serious shopping. I do think I am pretty well set on the 5065e. I am pretty well set on John Deere. We are a John Deere family. They have always been good to us, so id like to continue the tradition. The tractor also seems to be affordable and up to the tasks I will have at hand. I am planning on keeping the machine a while, and looking not only at my needs today but also my future needs. I believe this tractor would give me quite a few years to grow until I had to buy a larger machine. Best of all worlds for me.