weight position

hi all, i do a little farm stock pulling with a JD 720 in 8500, 9500, and 10500 mostly on dirt tracks with a couple gravel, right now i carry all may weight on the rear of the rear axle, with a bracket up front that i throw some on as i think i need, my question would i be better off to have a belly bar to hang my weight on instead of everything behind the axle? typically i spin out but on if i get on a good tight track i can go till out of power, think at that pull i had about 600# up front and it was still off the ground. not sure where i would mount one if i were to put one on, would probably have to go off frame in front of flywheel. is it worth the effort or should i stick with what i have? any suggestions on what works or don't are appreciated as well as any pictures would be good.
 
What you want to achieve is at the end of your pull the front wheels are in inch off of the ground. However you do that, (rear, mid, front) is up to you. For my tractors the rear weights are very tight against the rear axle and the fronts are out to the maximum 11 ft length. If I hook in a 4500 lb class and the balance is good, the next class up (5000)is usually 400 lbs added on the rear and 100 lbs more on the nose. A well -located belly rack, you might add all 500 right there.
 
My mid ~ship bracket comes in handy if I run across a place that will not allow weights past the grill. Hang enough in the middle to keep front down.
 
I don't think it makes any difference. That said I on my JD. To pull 4000 I put two weights (63) rr.lr then two cl.cr. then two fl. Fr. Then move two more put where I think they should be. But have had 8 on front. Or up to 12 on the rear. So its hard to say. I hang 3 of those weights on just 1/4 X 2" X 5" bolted on with a 3/8 bolts. Doesn't take much.
 
I don't pull a Deere but pull farm stock 7,500-10,000 and 0-10,000 lb. class. My 450 weighs 8,000 lbs.no fluid in tires and 2 wheel weights on each side and front wheel weights along with a 1,000 lbs of barbell weights that I can through( went with mostly 25 pounder).I have 400lbs of barbells on drawbar and the other set (600lbs.) hanging on TA housing. The front end might come 2" off ground at the end of pull. I went with barbell weights because I can't through the large weights after several back operations and injections.
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sure does make a difference !!!!!!!!!!!!!!!!!!!!!!!!! weights in the middle go either front or back,if you guess wrong,some goes each way. LOL
 
You have to think about weight placement like a torque wrench or breaker bar. The bolt your torqueing is the axle shaft. The longer the breaker bar ( weight further away from the axle) the less weight it takes to produce the same amount of torque.
Torque = distance x weight (aka ft*lbs)

So putting 600lbs 5 feet in front of the axle has the same effect as 300lbs 10 feet in front of the axle.
600lbs x 5ft = 3000ft*lbs = 300lbs x 10ft

Or, putting 1000lbs 2 feet behind the axle has the same effect as taking OFF 200lbs from 10 feet in front of the axle.
1000lbs x 2ft = 2000ft*lbs = 200lbs x 10ft
one acts to push the front end down the other to push it up.

The further forward or backward you can get the weight, the less weight you need for the same effect. Thus rules for how far weights can stick out the front or back.

The tractor itself also produces the same torque effect. Weigh your front wheels, measure the distance from the rear axle. Multiply them together and you get XXft*lbs. That's how much torque it takes to get the front end off the ground.

Your hitch height and distance from the axle center also produce a torque about the axle shaft. Again the reason for hitch height and length rules.

You can figure out the net effect of all of your weight brackets using these simple formulas.

T=(weights x distance) + (front end weight x distance) - (torque from the wheels) + (torque from the hitch).

Add them all together with behind the axle being negative and in front positive. The difference is how much effect the weights on your tractor will have to lift the front end or set it down. The goal is to have the torque the transmission is applying and the tires are transmitting to the track to match the torque caused by the weight of the tractor plus the torque caused by the weights. Leaving all the weight on the back tires and none on the front but not so much that the hitch height drops reducing the torque produced by the hitch. (and this is only considering static loading, there are smaller effects that are dynamic - caused by movement - that factor into it too, but are minimal compared to the static loading)

Big picture, you need to have the appropriate brackets to match your setup. Everything from tire size to hitch height to engine feed into where you should put weight brackets.

Trial and error is the best way to figure out what works, keeping in mind how the changes you make effect the torque applied to your axle.
 
I use belly weight bracket all the time and only go to back when I have no more room on belly. That being said it proably gets down to what you are used to doing. I personal think you have a little more wiggle room with belly bracket. Don't have to be as perfect with where you put your weights. GOOD LUCK
 
I mean you can weigh it using just front and rear. Or use front center and rear. Actually a big weight on a track underneath would be best!
 
yes,movable on a track,awesome,saw one on a two wheel drive pick up,worked great,--kicked butt on four wheel drives.
 

I hope I quit pulling before I can't decide whether to put them on the front or back so that I just hang them in the middle.
 
Noone else seems to think of it but.... Where your weights will go highly depends on your pulling situation.
Long chain or short chain?
Hitch will effect this.
If its a very soft track or not.
None of us can answer that.

Belly bar can be a safe place to start. But time will teach you to expand on weight placement areas. At least start with a rear rack and a belly bar. The nice thing about a belly bar is even if you put too much there, some of that is still helping the rear tires.
 

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