3pt lifting issue.... or not?

[coachgeo]

RE L225 and boom lift ability.

Took out my MMM cause the shroud was bent and stopping the blade from rotating. What a PITA is it to remove. Anyway... when I first bought this tractor I could man handle the deck and slowly flip it myself. That was last Oct. Now due to what I think is work related injury I can't sooooooo.. I found a boom for 65 bucks..... so here now a new issue arises.

First attempt to use the boom (advertised as an 8footer and looks to be) to lift one side of the MMM, standing it upright with plan to then flip over and lower back down, I found it could barely lift it. Managed to get it high enough to then drive forward to do the rest of the flip for me.

Bent the Shroud straight with sledge. Now I'm attempting to reflip the MMM. BUT...... the boom wont lift it but an inch now. Granted Im lifting from opposite end I did last time so maybe weight is different on that side than the other?

At 8foot out should my L225 have issue standing up this Woods? MMM Would think a Hay Bale Would be crap load heavier than the MMM.

 

[Daren Todd]

Coach, can you post a picture of the boom?

I'm thinking part of the lift issue for the boom is where the load center is placed. Are there places to hook closer in on the boom to try again?

When they stab a round bale with a bale spear, the bale is actually quite a bit closer to the tractor. Same with the center for the weight that it's lifting. The further out the weight is the more down force it excerts. And more power will be needed to lift it. I know most of us have fished something out of a hole with a rake or shovel. The closer the weight is to your body, the easier it is to lift and carry

 

[coachgeo]

Well not sure if one thing or a combination helped.

1. tractor rested about an hour
2. moved the attach point on the MMM, back to the side I had originally tied it to on the first flip
3. attached to Boom about 1' inward from end of Boom. On first flip it was tied to end of boom.

End result; she raised much easier and faster acted as if she would have been able to go higher but I didn't need too for this task, thus didn't think too.

Now back to putting MMM under the tractor..... not looking forward to it.

 

[Daren Todd]

Here's something that may help explain it. Kubota based there lifting capacity off a certain distance off the tractor. Not sure exactly what that number is but I'll use 2ft off the 3ph lift arms as the load center for this example. (the center of the weight being lifted). And use 800 lbs as total lift capacity. Now for the dreaded math

To figure out load capacity for a three foot load center you multiply 800x24 then divide by 36 for the new lift capacity. Divide by 48 for a four foot load center, 60 for a five foot load center..ect...ect...

example: 800x24/36 = 533.33lbs

2ft load center: 800lbs total lift capacity
3ft load center: 533.33lbs
4ft load center: 400lbs
5ft load center: 320lbs
6ft load center: 266.66lbs
7ft load center: 228lbs
8ft load center: 200lbs

This formula also works for the lifting capacity on a bucket or pallet forks. You just need to know where the load center is based on. The formula gets you in the ball park and could be a little more or less then the number depending on design and machine

 

[Grouse Feathers]

Here's something that may help explain it. Kubota based there lifting capacity off a certain distance off the tractor. Not sure exactly what that number is but I'll use 2ft off the 3ph lift arms as the load center for this example. (the center of the weight being lifted). And use 800 lbs as total lift capacity. Now for the dreaded math

To figure out load capacity for a three foot load center you multiply 800x24 then divide by 36 for the new lift capacity. Divide by 48 for a four foot load center, 60 for a five foot load center..ect...ect...

example: 800x24/36 = 533.33lbs

2ft load center: 800lbs total lift capacity
3ft load center: 533.33lbs
4ft load center: 400lbs
5ft load center: 320lbs
6ft load center: 266.66lbs
7ft load center: 228lbs
8ft load center: 200lbs

This formula also works for the lifting capacity on a bucket or pallet forks. You just need to know where the load center is based on. The formula gets you in the ball park and could be a little more or less then the number depending on design and machine

Daren
I was also looking at this, but I think you need to go back to where the 3 point lift arms connect to the tractor. I am guessing those arms are 2 feet long, so for your 3ft load center (adding 2 feet to all of your dimensions) it would be 800x48/60 = 640lbs and 8ft would be 320lbs.
Finally I looked up the Kubota L225 on http://www.tractordata.com/farm-tractors/001/2/9/1291-kubota-l2250.html and the 2 ft lift capacity is 1435lbs and this would give an 8ft lift capacity of 574lbs.
I am looking at this as an engineer and not as an experienced tractor guy, so I am not positive these numbers make sense. If the tractor data is correct and my analysis is correct I would say coach's 3 point may be a little weak at least when hot.

 

[Daren Todd]

Grouse feathers, I was just thinking the same thing. And throwing some numbers based off my tractor as an example. I'm just going off my forklift instructor class I took a while back. And not knowing where they figured there load center at this is just a guess. So lets see what I come up with again. If they figured the load center at the pins that connect to the implement on the lift arms. So still using a two foot load center if the arms are two foot long. His 8ft boom pole would put him at a ten foot load center at the end of the pole.

So new numbers based on the l2250 1435lb lift at 2 ft load center. Since we can't find the lift capacity on the l225
2ft load center: 1435lbs
3ft load center: 957lbs. 1435x24/36
4ft load center: 717.5lbs. 1435x24/48
5ft load center: 574 lbs. 1435x24/60
8ft load center: 358 lbs. 1435x24/96
10ft load center: 287lbs. 1435x24/120


Of course milage may very

 

[Grouse Feathers]

Grouse feathers, I was just thinking the same thing. And throwing some numbers based off my tractor as an example. I'm just going off my forklift instructor class I took a while back. And not knowing where they figured there load center at this is just a guess. So lets see what I come up with again. If they figured the load center at the pins that connect to the implement on the lift arms. So still using a two foot load center if the arms are two foot long. His 8ft boom pole would put him at a ten foot load center at the end of the pole.

So new numbers based on the l2250 1435lb lift at 2 ft load center. Since we can't find the lift capacity on the l225
2ft load center: 1435lbs
3ft load center: 957lbs. 1435x24/36
4ft load center: 717.5lbs. 1435x24/48
5ft load center: 574 lbs. 1435x24/60
8ft load center: 358 lbs. 1435x24/96
10ft load center: 287lbs. 1435x24/120


Of course milage may very

Well I have to apologize for bad information, last time I couldn't get a L225 tractor to come up on tractor data and this time I did. They do not list a lift capacity for the 3 point hitch, but the hydraulics on the L2250 were seriously upgraded over the L225. The L225 had 1700 psi and the L2250 had 2275 psi. Probably your 800lbs number was closer and the L225 would struggle to lift an 8' boom with little to no weight hanging on it.

 

[Daren Todd]

Well I have to apologize for bad information, last time I couldn't get a L225 tractor to come up on tractor data and this time I did. They do not list a lift capacity for the 3 point hitch, but the hydraulics on the L2250 were seriously upgraded over the L225. The L225 had 1700 psi and the L2250 had 2275 psi. Probably your 800lbs number was closer and the L225 would struggle to lift an 8' boom with little to no weight hanging on it.

No worry's. Was just using info off my old l1501 as an example, and some stuff I learned in class. Go figure, someone gave me a license to teach and certify forklift operators I figured someone would have a better idea of how lifting capacities work if they saw how the numbers dropped the further out you went

 

[coachgeo]

Actually knew the weight lift weight amount drops further out you go on the boom. It's common sense physics..... just didn't know what my L225 lift weight rating at the eye of the 3pt arms is. Believe that is where they rate the tractor. Also don't know how heavy the MMM might be. Figured either someone would have real world experience; or knew the numbers, would pipe in to let me know if my tractor is working as designed or if I should assume some work in my future on the Hydraulic system. Sounds like that may be the case judging by ya'lls math. 200lb at 8ft should lift and I don't think the MMM is much more than that but could be wrong there.


PS- thanks for the math! Will benefit many members here by your having shared how to calculate it out!!!