MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 57,788
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
Pull from the front or the rear?
- Thread starter strantor
- Start date
- Views: 30933
CobyRupert
Super Member
Hmmm...... I wonder what the cut-off year is between modern tractors that can't flip and those that can is? Maybe a '95 tractor can flip, but a '96 can't? I guess knowing the year your tractor was made is VERY IMPORTANT, your life could depend on it!
4570Man
Super Star Member
- Joined
- Apr 7, 2015
- Messages
- 18,357
- Location
- Crossville, TN
- Tractor
- Kubota M59, Kubota L3800, Grasshopper 428D, Topkick dump truck, 3500 dump truck, 10 ton trailer, more lighter trailers.
It’s the design change. Find one case of a modern tractor with a loader rolling backwards.
npalen
Elite Member
Its what you see in a tractor pull where the distance between the tractor drawbar and the sled is very short. The line of pull, which is the attaching chain, forms a line that passes above the tractor axle. The front end of the tractor comes off the ground until the chain is in line with the tractor axle.
The longer the drawbar is behind the axle the more pronounced is the "chain line" above the axle. Really needs an illustration to show this but just picture a line drawn thru the chain and passing above the axle.
JohnBuffaloMN
Silver Member
Not to dampen the lively dialogue, but I'm going to post a link to a HOSTA - Hazard Occupation Safety Training in Agriculture - PDF that explains the many ways to connect implements to your tractor. It has helped me to better comprehend the various risks associated with each method.
https://articles.extension.org/sites/default/files/NSTMOP Task Sheets Section 5 2013.pdf
juan
https://articles.extension.org/sites/default/files/NSTMOP Task Sheets Section 5 2013.pdf
juan
WranglerX
Super Member
Oh CRAP, my tractor is defective, "chassis" draw bar is only 8 inches off ground, according to page 2 of document it should be 15 (+/-) inches and my drawbar material is a lot smaller in dimension than specified in chart....Guess none of what document says will apply for me....
Dale
The 3-point drawbar was part of Ferguson's patented hitch system for transferring trailer weight to the tractor for better traction. I didn't notice any mention of it in the hitch patent, which was mostly about the draft sensing.
When the 3 point hitch first became available, almost all older implements were pulled, not carried. The implements usually had a clevis hitch. The 3 point drawbar (with stay straps to keep it at a fixed level) was convenient for these implements, and also allowed greater vertical angle in dips and ridges than the fixed or swinging drawbar and clevis.
Bruce
When the 3 point hitch first became available, almost all older implements were pulled, not carried. The implements usually had a clevis hitch. The 3 point drawbar (with stay straps to keep it at a fixed level) was convenient for these implements, and also allowed greater vertical angle in dips and ridges than the fixed or swinging drawbar and clevis.
Bruce
I can't picture that. The chain attaches to the drawbar below and behind the axle. The drawbar is fixed. If the front end lifts the attachment point gets even lower. How does the chain line ever get above the axle?
I've added a diagram:
As the tractor front lifts, the attachment point of the chain gets lower and tries harder to pull the front end down. If the chain is attached to a high point on the load (red chain) it tries even harder to pull the tip of the drawbar up, and the front of the tractor down. There is no way for the chain to swing above the axle and contribute to tipping.
Last edited:
npalen
Elite Member
Shorten the chain and attach it to the load down low to the ground. Might have to lengthen the drawbar a little also to get the chain line above the axle.
Like this:
OK, I see now, if the drawbar is long enough, the load attachment point low enough, and the chain short enough, you can get the line of the chain above the axle until the tractor tips up enough. Then, if it tips past the position in the lower sketch the chain begins to pull the front end down.
I can see that drivers in tractor pulls might rig this way to increase traction. I suppose that's why drawbars on real tractors aren't that long.