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Best tire pressure

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dan szzz

07-14-2002 17:07:56




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I am new to this stuff and I was thinking of pulling my JD 4020 in a local stock pull. I am not sure how much air pressure to run in the tires. It has almost new firestone all traction 23 degree radials. right now i am running at 18, but i thought it should be lower to get more traction.

Thanks




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Tony

07-17-2002 08:52:31




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 Re: best tire pressure in reply to dan szzz, 07-14-2002 17:07:56  
Hello, On the tire pressure you just want the tire to squat a little. As long as all the tread is hitting the ground. If you are running a radial then you will have no problem with 18 pounds. You don't want to drop the pressure too much because the lower the tires the lower the drawbar. Tony



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G Taylor

07-15-2002 18:39:33




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 Re: best tire pressure in reply to dan szzz, 07-14-2002 17:07:56  
The Firestone manual says 6psi minimum and will carry 2830lbs per 18.4x34 radial tire. In the field they should have 10psi if your tractor weighs 10,000 lb gross and has proper fore/aft balance. If balanced on the track with 5000lb per rear tire then 16psi will "rated carry" the weight.



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Greg H.

07-15-2002 13:20:11




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 Re: best tire pressure in reply to dan szzz, 07-14-2002 17:07:56  
dan szzz,
I pull a stock 4020 in the 9,000 and 10,000 pound natural asperated farm class. I have used as low as 12 pounds, but found that my tires flattened out to the point that I lost drawbar, and would spin out anyway. currently I use 16 pound of air with 18.4x38 firestone field and roads, and the sled still pulls them down flat enough that the whole bar seems to get a good bite. Your raidial tires probobly have a thicker sidewall than my tires, but I still don't think I would take too much air out of them, until you see how they handle on your first pull. If you spin like you are on a bar of soap start playing around with the air, but don't go as low as some have suggested, or you will look down at your tires, and the sidewalls will only look like they are a few inches thick, which means your tread is probably curling up at the center of your tire. Good luck, you can have a heck of alot of fun with a 4020 in a stock pull. You sould be able to go 2nd gear up to the 10,000, and then first for the heavier classes. Later on Greg H.

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mo air

07-15-2002 17:50:54




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 Re: Re: best tire pressure in reply to Greg H., 07-15-2002 13:20:11  
radials flex a lot easier than a bias tire. you will need more air in them. I have seen guys run 30 lbs (yes 30) in them in the 7500 lb. class.



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Greg H

07-17-2002 09:50:05




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 Re: Re: Re: best tire pressure in reply to mo air, 07-15-2002 17:50:54  
mo air,
Firestone had their radials based at a 10 ply rating, where the conventional tires only are rated up to 8 ply. If it's not based on sidewall strength, or stiffness, is it rated on basic capacity to withstand pressure or what? I'm not trying to be a smart a88 ir anything, I'm just interested in knowing why. Yeh I've seen people pull with 18-20 pound in radials before because they have a reputation of bouncing at higher speeds, but I was unaware of why. Post back and fill me in on those radials. Later Greg H.

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Puller504

07-14-2002 18:36:31




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 Re: best tire pressure in reply to dan szzz, 07-14-2002 17:07:56  
General rule of thumb on clay tracks here in Ohio is one psi for each 1000# of weight allowed in the class. 5000# class is 5 psi, 7000# class is 7 psi, 15000# class is 15 psi, etc. Hope this helps.



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redhead

07-14-2002 18:10:56




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 Re: best tire pressure in reply to dan szzz, 07-14-2002 17:07:56  
Dan, hook the JD to something heavy and hard to pull (maybe try to pull a bigger tractor with it's brakes locked), doesn't matter if you can't move it. Spin out and look at the print, cupped in center-increase psi, flat-just right, dished in center-decrease psi. This is a good start. Track condition and tractor wieght will change required psi. Good Luck.



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cd

07-14-2002 21:20:14




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 Re: Re: best tire pressure in reply to redhead, 07-14-2002 18:10:56  
that wont work because you dont have downforce, I think your 18 will be ok maybe 20



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