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Tractor Talk Discussion Forum

Air in loaded tires??

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SJ

03-28-2006 16:38:41




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Is there any special procedure when adding air to loaded tires other then having valve stem at the top of tire.Whats recommended air pressure when tires are loaded? They are 15.5-38s on a Oliver 1550.
Thanks Stan




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BobMo

03-29-2006 17:40:44




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
You need to know how much fluid is in your tires. If it its 10 percent air and 90 percent fluid you ratio will be 9 to 1. If the manufacture recommends 30 psi you need to multiply 30x9 which will be 270 lbs. You should divide that by 18 and multiply x 2(since you have 2 wheels) and pressurize accordingly. Of cousre this may not work if you have different size tires. For Olivers pressurize in accordance with the manufactures recommendations..
Stem should be at the top but doesn't have to be if you have a wet gage. Don't, I repeat, don't use a business card as a pressure indicator. Since tires are designed differently it would be foolish and dangerous...Good luck..

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Allan In NE

03-29-2006 18:04:02




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 Re: Air in loaded tires?? in reply to BobMo, 03-29-2006 17:40:44  
Bob, you knucklehead!

I was gonna accuse you of stayin' too long at happy hour, but after figurin' it a couple of times, that was funny! :>)

Allan



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Walter Squires

03-29-2006 07:17:14




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
Because a certain model can vary so much in weight from ballasting, cast centers vs steel centers, mounted equipment and so on, I always used the rule of thumb of being able to slip a business card about an inch under the outside edge of the tread instead of using a certain air pressure the owners manual called for. A JD factory man told me that 30 years ago and it always seemed to work very well.

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Harley

03-29-2006 09:28:47




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 Re: Air in loaded tires?? in reply to Walter Squires, 03-29-2006 07:17:14  
Walter, must be nice to have a job where ya gots business cards. How bout the folded over flap on a Red Man pouch? Harley



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Walter Squires

03-29-2006 12:28:06




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 Re: Air in loaded tires?? in reply to Harley, 03-29-2006 09:28:47  
Harley it sure is nice having business cards, just think now everybody has your phone number, home, work, cell, of course nobody ever calls you to eat your a$$ out, calls you at home 11:30 at night, tell you what a pile of crap that piece of equipment is, leaves your card with the ugly woman sitting at the end of the bar.
Great Idea, think I'll just scribble my work number on the flap of a Red Man pouch..... ...:)


Walter

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RodInNS

03-29-2006 08:52:03




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 Re: Air in loaded tires?? in reply to Walter Squires, 03-29-2006 07:17:14  
That could work too, as a rule of thumb. However, the op's manual ought to have tables showing the tractor's weight distribution front and rear, with additions for wheel weights, suitcase weights, and along with tire fluid capacities. This should bring a person very very close to a tractors weight with or without ballast, including it's distribution. Then consult the tire chart which should show all the tire size options that were available for that model, along with a load carrying capacity of that tire at pressures from mabey 6 psi up to 24 psi, often in increments of 1 psi. It should allow you to match exactly what pressure is required. This is certainly in the manuals I have fromth emid 70's onward. Mabey old manuals didn't have that. Dunno. Like you say, a good rule of thumb, but there should be charts out there....

Rod

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RodInNS

03-29-2006 07:09:37




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
Add air when the stem is at the top. Get a spring return pressure gauge that spits the fluid out when you're done with it. They do last for several years, which is better than a few days for the regular type gauge. And it certainly never hurts to have a spare valve core close at hand. They do corrode, and from time to time need replacing. As far a pressure goes..... that depends on the load you're carrying. If you look in your operators manual there may be a chart showing the correct inflation pressure for a given tire/load combination. If not, a tire shop ought to have one. Understandably, as you put more weight on the tractor, more weight is transfered to the tires, and the tires require more air to carry that load without flexing. I don't know the correct inflation for your tractor, but on most of my tractors, with bias drive tires, I'm running 15-20 psi. Again, this depends on what you're carrying. HTH.

Rod

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Nebraska Cowman

03-28-2006 17:09:07




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
nothing special but don't use a gauge unless you want to ruin it. even the ones that are made to test liquid won't last long if you do. And I always like to have a spare valve core assembly on-hand incase the old one spurts water.



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Nebraska Cowman

03-28-2006 17:09:06




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
nothing special but don't use a gauge unless you want to ruin it. even the ones that are made to test liquid won't last long if you do. And I always like to have a spare valve core assembly on-hand incase the old one spurts water.



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Nebraska Cowman

03-28-2006 17:08:54




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
nothing special but don't use a gauge unless you want to ruin it. even the ones that are made to test liquid won't last long if you do. And I always like to have a spare valve core assembly on-hand incase the old one spurts water.



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dairyman

03-28-2006 17:08:00




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 Re: Air in loaded tires?? in reply to SJ, 03-28-2006 16:38:41  
sounds like you got the right idea. in regards to air pressure I usually run about 10 psi in rear tires if they are loaded.



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