MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 66,209
- 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: 35981
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
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- Crossville, TN
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- 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.
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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.
CalG
Super Member
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- Hurlimann 435, Fordson E27n, Bolens HT-23, Kubota B7200, Kubota B2601
A longer draw bar get's lower with less rotation of the tractor. If long enough to strike the ground, it acts as a wheelie bar.
Having the load weight the tires is GOOD! for traction. The important thing is to not allow that goodness to get too far.
A load hitched to a 3pt spreader bar does not have the ability to change the center of pulling force. The lower lift arms on on pivots.
Deadly! Unless the lift is designed for position control with down force.
I'm liking the Hurlimann more and more. Position control is the normal mode. And can even be combined with draft control.
Float is the difficult setting. I've got to run chains for lift links on the blower for the softest float condition. ;-)
DieselBound
Elite Member
If tractors pulled better from the front then you'd see all the plowing done with plows up front (and tractors going in reverse!)
Draw bar!
But, always, use caution when dealing with large forces.
Draw bar!
But, always, use caution when dealing with large forces.
JohnBuffaloMN
Silver Member
Can't be - it is stated in the document:
"Figure 5.1.d. Tractor drawbars are
designed at the correct height from
the ground to keep the pull forces
below the center of gravity."
Have you checked your tire pressure?
WranglerX
Super Member
It's a MF GC 1715 (SCUT) everything is low to ground....And yes it advertises as a CAT 1 hitch which implements seem to fit.... Picture soon ... Done ..
Guess your next comment will be "its not a real tractor"...
Dale
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JohnBuffaloMN
Silver Member
It was a joke.
LouNY
Super Star Member
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This thread has some factual info, a bunch of hysteria and some nonsense.
Yes, you should try to pull from the fixed belly mounted drawbar most of the time,
that is your most stable pulling point. Can you use a 3 point drawbar? Certainly
they have been used many times, can they be more hazardous? Most certainly.
Any tractor can and will rear up in the air under certain conditions,
1) good traction
2) a hard pulling load
If the pulled load exceeds your tractors pulling capacity but you have traction and power your tractor will rotate the front up,
an unmoveable load with enough traction and enough gearing will lift any tractors front end. Usually traction is lost and the tractor will spin out and stop lifting the front end.
One problem with pulling from 3points is that there is no upward travel stops, under hard pulls when the front starts to lift which it will because you can pull harder with the higher hitch once rotation starts the 3 point hitch will abruptly jump allowing rapid rotation and rear over turning.
When any heavy pulling is done using the lift arms there should be a travel limiter used to prevent the lift arms from uncontrollable lifting.
A chain down to the fixed drawbar or solid limiters from the top link attaching pin point on the tractor.
Yes, you should try to pull from the fixed belly mounted drawbar most of the time,
that is your most stable pulling point. Can you use a 3 point drawbar? Certainly
they have been used many times, can they be more hazardous? Most certainly.
Any tractor can and will rear up in the air under certain conditions,
1) good traction
2) a hard pulling load
If the pulled load exceeds your tractors pulling capacity but you have traction and power your tractor will rotate the front up,
an unmoveable load with enough traction and enough gearing will lift any tractors front end. Usually traction is lost and the tractor will spin out and stop lifting the front end.
One problem with pulling from 3points is that there is no upward travel stops, under hard pulls when the front starts to lift which it will because you can pull harder with the higher hitch once rotation starts the 3 point hitch will abruptly jump allowing rapid rotation and rear over turning.
When any heavy pulling is done using the lift arms there should be a travel limiter used to prevent the lift arms from uncontrollable lifting.
A chain down to the fixed drawbar or solid limiters from the top link attaching pin point on the tractor.
WranglerX
Super Member
Walkin Horse
Platinum Member
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All this talk about pulling and using chain. Isn't that dangerous no matter where you pull from? There was a guy around here pulling on a stump with a chain. It broke and came through the back window of his truck and killed him. I use a chain maybe to lift with but to pull I use a nylon choker or a 9/16 cable with 3 clamps on each end.
MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 66,209
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
