tractor for maximum 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.