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Allis Chalmers Discussion Forum
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Too much pressure!

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Eric

07-31-2004 00:35:33




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For those who have a D-19 how much pressure do you run in the rear tires,34's I believe, I pumped them up so they didn't look soft and now don't have the traction, I wonder what they should be at with calcium. Thanks all.




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John (MO)

08-02-2004 05:37:34




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 Re: Too much pressure! in reply to Eric, 07-31-2004 00:35:33  
D-19 manual says 14 to 16 pounds.



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DanD.

07-31-2004 05:47:49




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 Re: Too much pressure! in reply to Eric, 07-31-2004 00:35:33  
I can't tell you exactly for that specific application. How much do you have in them now? Often, tractors run somewhere around 12 or 15 psi.



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Eric

07-31-2004 18:47:26




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 Re: Too much pressure! in reply to DanD., 07-31-2004 05:47:49  
Close to 40 before they really looked good, I know they are loaded and am wondering if that changes the pressure, they were really soft looking before though, maybe that's just how they should be? Thanks anyway



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Lil-Farmer

08-01-2004 07:18:03




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 Re: Too much pressure! in reply to Eric, 07-31-2004 18:47:26  
I would say you are very lucky not to be covered with calcium chloride. Almost all rear tractor tires are marked on the sidewall "Do Not Exceed Thirty Pounds When Seating Beads". Operating pressures are substantially less.

The bigger the tire, the less pressure. Using the width rating as a guide is something that is wrong. A bigger, wider tire has more square inches of surface area and therefore needs less actual air pressure (PSI) to carry the weight.

Your 34" tires should have no more than 20 pounds and maybe only 16 to 18. Check with your local tire store for actual pressures.

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DanD.

08-01-2004 05:43:25




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 Re: Too much pressure! in reply to Eric, 07-31-2004 18:47:26  
You never put anywhere near 40 psi in a tractor tire. What the other post suggests is a good rule of thumb. However, I'd put in somewhere around 15 psi and then drive.



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AZ Jack

07-31-2004 22:07:18




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 Re: Too much pressure! in reply to Eric, 07-31-2004 18:47:26  
A good rule of thumb is to inflate to whatever the width of your tire is. I would first ask your tire supplier what he suggests. 40 lbs is sure as hell too much-you don't air a radial up to where it stands "up"-that is the purpose of the radial- to have some "squat" and give you more traction.



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