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Tractor Talk Discussion Forum

More Tires

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Allan In NE

10-12-2006 17:18:53




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Hmmmm,

Got my old tractor done and took it back out to the country this evening.

Thing has radial tires on it. At about 2/3 throttle in road gear it gets to bouncing up and down in a rythmic fashion and the only way I can straighten it out is to slow down a bit.

Do radials need more air than a bias ply tire to stay "stable"? Never had a set of raials before.

Allan




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jddriver

10-13-2006 05:34:27




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 Re: More Tires in reply to Allan In NE, 10-12-2006 17:18:53  
Allen Firestone told us that you should have 1.75" more bulge at bottom of tire than top.We have had no problem since doing this.I like the lower air pressure to get a bigger footprint and less soil compaction.Steve



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550Doug

10-13-2006 05:31:35




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 Re: More Tires in reply to Allan In NE, 10-12-2006 17:18:53  
I had a new pair of 13.6x38 put on my rims this past summer. They too had a terrible bounce in road gear. I called back the installer and after doing a crude check on tire balance, he swapped the rims and adjusted the rim mounts to get a better balance. It worked! Still only has 18 pounds of air. He pointed out to me at road speed how the tread height was moving above the fender then below, indicating a tire out-of-round. He says its a real common problem with less quality control from manufacturers today.
Hope this helps

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IaGary

10-13-2006 03:27:54




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 Re: More Tires in reply to Allan In NE, 10-12-2006 17:18:53  
Allan

I had the first set of radial tires in my county in 1978.

Ran them at 18# and tore up the sidewalls before they wore out from to much weight.

Was told on my second set to go to 21#.
That was better but the tire dealers around here tell us to run 24# now.

You will still get a bigger tire print at 24# than a bias ply at 15#.

Gary



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Tx Jim

10-13-2006 03:24:41




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 Re: More Tires in reply to Allan In NE, 10-12-2006 17:18:53  
Allan,are you tires filled with H2O? If not filled to correct amount can cause your problem as it gets to slooshing. Tx Jim



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Tire iron monkey

10-12-2006 21:43:41




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 Re: More Tires in reply to Allan In NE, 10-12-2006 17:18:53  
Radial tire @ low air pressure wil not mix people go by what the tractor sale man tell them to do.we can find a lot of loe pressure junk here if you want them thats what got firestone sued people knowing more than the tire manufactor them self put that air where it needs to be high air pressure wil not kill a tire low pressure is like putting you on a diet



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iowa_tire_guy

10-12-2006 17:49:51




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 Re: More Tires in reply to Allan In NE, 10-12-2006 17:18:53  
What you have is a radial walk. If are not going to be farming with it then air them up to the max pressure according to the star rating. Read the sidewall for the max pressure to operate, not the 35 lbs to seat bead.



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Allan In NE

10-12-2006 18:05:56




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 Re: More Tires in reply to iowa_tire_guy, 10-12-2006 17:49:51  
It's got 18.4 X 38s, lots of weight and will be doing heavy tillage. Also, probably on the road a lot too as those fields are way out there.

What kind of pressure do you think they should run?

Allan



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MN Scott

10-12-2006 20:33:05




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 Re: More Tires in reply to Allan In NE, 10-12-2006 18:05:56  
On my 7810 I have radial firestone 18.4x42 duels and pulling heavy tillage equipment and going by the Deere worksheet I run 10 psi in all four rear tires. If you are running singles with that heavy plow and weights I would run at least 20 psi to start with. When I run my baler in the summer with singles I run 20 psi and they still cheek out pretty good. With my 7810 I wouldn't want to pull a heavy plow with singles at 20 psi, would be afraid of tearing the sidwalls out. Have you checked the tire makers web sites? There should be some reccomendations or charts somewears on the net on tire loading and pressures.

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John17

10-12-2006 18:19:30




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 Re: More Tires in reply to Allan In NE, 10-12-2006 18:05:56  
Allan, you will be happy with your radials, once you get used to them. For heavy tillage, you want as long of a foot print as possible, in other words LOWER air pressure. Try them at 10 lbs, and see how your traction is. You can adjust down to 6 lbs, for a minimum. As far as the "bounce" you feel, that is fairly normal. It should feel more like a "lope" though. HTH, JohnG



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Allan In NE

10-12-2006 18:27:22




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 Re: More Tires in reply to John17, 10-12-2006 18:19:30  
Thanks John, that's what I needed to know.

Sure caught me off guard.....that "lopin' thingy. :>)

Allan



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iowa_tire_guy

10-12-2006 18:42:33




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 Re: More Tires in reply to Allan In NE, 10-12-2006 18:27:22  
Well you really can't tell how low to go on pressure unless you know the axle weight. Yeah right, I know. But I have seen radial tires ruined by the operator just guessing at what he could run in them. If you have lots of weights on the tractor I would be leary of runing as low as 10. As for what pressure to run I recomend that it can be changed for the season and what the tractor is doing. Here in the fall when it is pulling wagons on the road, air them up. Then when it is time to plow, let it down. Also remember that you lose 1 pound of air pressure for every 10 degree drop in air tempature. Check them on a nice sunny day and start plowing on a cold day and you have lost 3 to 5 lbs.

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