tractor for maximum traction

[BHD]

one could make a strain gauge out of a hydraulic cylinder, and a fluid filled pressure gauge, fill the cylinder full of oil and attach the gauge, if one needs a remote location one could use a length of hose, to the gauge, a valve in line could be used before the gauge to help protect the gauge, and I think there is some isolators that can help protect the gauge from shock loads, http://www.crosshydraulics.com.au/files/products/gauges&Accessories/FT291.pdf
or a GAUGE SNUBBER which is a part that has a micro sized hole so the gauge is not a direct of the complete force of the oil
https://www.google.com/search?num=1...msedr...0...1c.2.64.serp..0.1.463.HeZx3EmBEfA

attach the cylinder in between a pulled object and the tractor, by knowing the area of the piston and the rod of the of the cylinder, one can calculate the square inches and by looking at the gauge and the pressure created one can calculate the load that is being generated.

one could use a tillage tool for the load so it could be adjusted and tested on various soil types.

 

[texasjohn]

Maybe OMRAN will come back and let us know how he ends up addressing his question, given all this input.

 

[Mace Canute]

Being pulled on is what they are made for. makes no difference up and down or side ways. And not many CUTs weigh over 22,000 and your not going to pull more then your weight unless your wheels a steel cogs running in a steel rack. I'm sure if you want to test the big AG tractors weighing 100,000 plus somebody makes a gauge to do that job for quite a bit more money.

I'd sure like to see a 22,000 pound CUT!

Here's a 100,000 pound AG tractor...

 

[LD1]

I have made a few strain gauges out of old hydraulic cylinders. Works well. And I have an assortment of gauges too in varying pressure ranges for more accurate numbers. The particular cylinder I use, IIRC, 1 psi is equal to 1.47 #. SO with a 3000psi gauge, I can measure up to ~4500#. But using a 3000psi gauge with 100# increments isnt very accurate for weighing something 400 or 500 pounds. SO I also have a 100psi gauge with 5psi graduations and a 300psi gauge with 10psi graduations.

As to pulling power, studying several nebraska tests, it seems the drawbar pull for a FWA tractors is usually about 10-15% less than their weight. For 2wd tractors, 20-25% less than their weight, and for 4wd tractors with equal tire sizes (like that big bud), drawbar pull is pretty much the same as weight.

But as mentioned earlier, there are alot of other variables. The nebraska tests are in ideal conditions and pulling from a drawbar. Pulling from an elevated hitch, or something that adds downforce as it is pulled (like a middlebuster) increases the weight over the rear tires and can increase pulling power. Likewise, if you are chained to a tree 10' high, as you pull it takes weight off the tractor and can decrease power.

 

[texasjohn]

I'd sure like to see a 22,000 pound CUT!

Here's a 100,000 pound AG tractor...

Well, seeing Big Bud, I wonder.....

Are the rear tires loaded...what about the front?

Steering wheel spinner?

What does it do when it finds a field full of pallets?

Can you get a PATS quick hitch for it?

Turning radius?

When you own one, do you occasionally wish you had purchased "a little more tractor?"

 

[omran mubarak]

i appreciate all that thank you
and i have a question agian : how moving uphill and down hill will effect the traction

 

[vtsnowedin]

Work is usually defined as lifting a weight (or mass) a distance such as raising 100 pounds 10 vertical feet requires 1000 ft.-lbs of work. Working on the level you aren't raising anything just over coming the rolling resistance of your tires and the friction caused by the tools ground engagement. Gravity can work both for you (down hill) or against you (up hill). So for any given tractor and implement set up there are three max loads low, middle, and high. Low is going up hill pulling the tool with gravity fighting you. middle is pulling the tool across a flat, and high is pulling the tool down hill with gravity helping you.

 

[omran mubarak]

thank you
where can i find these three max loads for any tarctor

 

[vtsnowedin]

thank you
where can i find these three max loads for any tarctor

There are too many variables to pin it down to three exact numbers. How steep is the hill? How wet the soil? What does the tool weigh? How deep it is in the ground . How aggressive are the blades or points.ETC. ETC.
For many tractors you can look up the Nebraska tractor test and see what it's horse power really is and on older models what it's draw bar pull is. After that tires, ballast, tool weight, and soil condition decide weather you can pull it or not. But of course the bigger and more powerful the tractor is, as long as it is set up and ballasted properly, the more it will pull.

 

[Khalid Dohia]

how can i use a hydraulic piston with a gauge to measure tractor traction ?

 

[LD1]

how can i use a hydraulic piston with a gauge to measure tractor traction ?

Compress the cylinder all the way, and fill the rod end with oil. Throw a breather in the base end. The attach a gauge to the rod end port. You need to come up with some way to attach the two ends of the cylinder to a chain or strap. Now pull on the cylinder and note the pressure reading.

Calculating the pulling force is the same as doing the math to see how much force a cylinder will develop at a given psi.

Lets say you have a 1.5" bore cylinder with a 5/8" rod. The area of the piston is 1.77 sq inches and the rod area is .307 sq inches.

1.77-0.307=1.46 sq inches of piston surface in the rod end of the cylinder.

That means for each PSI your gauge reads is equal to 1.46# of actual force. If you peg a 3000psi gauge, that would be 4380# force.

You can always use larger cylinders for higher loads, or smaller cylinders or smaller gauges for lighter loads to get a more accurate number.

 

[omran mubarak]

thank you i appreciate all that
if you have a video showing that attachment of the cylinder to the gauges please let me know

 

[LD1]

Sorry I do not have a video. It is pretty simple. And I apologize for being blunt, but if you cannot figure out how to attach a pressure gauge to the rod end port of a hydraulic cylinder, you have no business building one for a force gauge. Cause attaching a simple pressure gauge to a port on a cylinder is far from the hardest part of the project.

 

[SPYDERLK]

As to pulling power, studying several nebraska tests, it seems the drawbar pull for a FWA tractors is usually about 10-15% less than their weight. For 2wd tractors, 20-25% less than their weight, and for 4wd tractors with equal tire sizes (like that big bud), drawbar pull is pretty much the same as weight.

I cant imagine such a result under ideal traction conditions. I measured the drawbar pull of my 2wd 2010 JD row crop with a Dillon 10K force gage at 7100# carrying a 600# bushog. AGs of course. ... According to specs the total system weight was 6950. The front wheels remained on the ground.
larry

 

[vtsnowedin]

I cant imagine such a result under ideal traction conditions. I measured the drawbar pull of my 2wd 2010 JD row crop with a Dillon 10K force gage at 7100# carrying a 600# bushog. AGs of course. ... According to specs the total system weight was 6950. The front wheels remained on the ground.
larry

Maybe they test them at average conditions instead of Ideal conditions.

 

[SPYDERLK]

Maybe they test them at average conditions instead of Ideal conditions.

Maybe. ... My test was on level solid turf, damp enuf to accept the treads

 

[jenkinsph]

Most of the strain gauge/weight indicators that I have seen fit over wire rope and measure the force it takes to straighten out a small bend in the cable. The principle is the same as the cylinder and pressure gauge but the gauge dial is calibrated to indicate in pounds. I would add that whatever method is used care should be taken that the strain gauge is sized correctly for safety. Don't want a cylinder pulled apart and hurt someone.

I suggest a little field work would help these students develop a better understanding of these traction issues. Knowing how to research is invaluable in school but so is some hands on experience.

 

[LD1]

I dont know. Just what I have noticed after looking at several Nebraska tests. Were you pulling from a drawbar? or the 3PH?

Here are a few examples:

Ford 4000 diesel 8-speed, 2nd gear pull, Ballasted total weight 8100#, drawbar pull 6019#..................74%
Same tractor, no ballast.......................................................4835#, drawbar pull 3845#..................80%
JD2010 diesel 8-speed, ........................Ballasted...................6392#, drawbar pull 4553#..................71%
Same tractor, no ballast .......................................................5120#, drwabar pull 3356#.................65%
Ford 4630 FWA diesel...........................No ballast..................5728#, drawbar pull 4833#..................84%
Farmall 95c FWA..................................no ballast..................7350#, drawbar pull 6350#..................86%
Deere 9620 4wd..................................no ballast...................39,275# drwbar pull 40,461#...............103%
CAse STX 450......................................no ballast..................39,500# drawbar pull 40,035#..............101%

Bout everything I look at is the same. The only ones that I see that can drawbar pull their own weight or more is the very LARGE 4wd tractors. Most under 120HP seem to get about 85% of their weight. And 2wd less.

 

[SPYDERLK]

I dont know. Just what I have noticed after looking at several Nebraska tests. Were you pulling from a drawbar? or the 3PH?

Here are a few examples:

Ford 4000 diesel 8-speed, 2nd gear pull, Ballasted total weight 8100#, drawbar pull 6019#..................74%
Same tractor, no ballast.......................................................4835#, drawbar pull 3845#..................80%
JD2010 diesel 8-speed, ........................Ballasted...................6392#, drawbar pull 4553#..................71%
Same tractor, no ballast .......................................................5120#, drwabar pull 3356#.................65%
Ford 4630 FWA diesel...........................No ballast..................5728#, drawbar pull 4833#..................84%
Farmall 95c FWA..................................no ballast..................7350#, drawbar pull 6350#..................86%
Deere 9620 4wd..................................no ballast...................39,275# drwbar pull 40,461#...............103%
CAse STX 450......................................no ballast..................39,500# drawbar pull 40,035#..............101%

Bout everything I look at is the same. The only ones that I see that can drawbar pull their own weight or more is the very LARGE 4wd tractors. Most under 120HP seem to get about 85% of their weight. And 2wd less.

Very strange. Frame drawbar pullwith the chain passing under the raised 600# bushog. 7100# indicated. My ideal conditions must be better ... or my 2010 is a bunch heavier. Im sure the counterweight had something to do with it. The front wheels did not leave the ground but I imagine they were close.