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 05-25-2001, 17:25 Post: 28572
David LaBrie



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 mixed R4 tires and PSI

When my Kubota, B2910 was delivered 2 weeks ago the R4 tires hadnŐt come in yet. The dealer agreed to swap the ag tires when the R4Ős came in. That was done today. On the back are Goodyear 12.4-16 R4Ős and on the front are Titan Track Loader 23X8.50X14 tires. Is it unusual to have two brands of tires on a tractor ? The tire pressure is set to 32PSI in all 4. Is that too high? my manual says 35psi for the front but 20psi for the back. Also the front tires look so small. Is that just my imagination?Thanks,David






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 05-25-2001, 20:06 Post: 28574
Bird Senter

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 mixed R4 tires and PSI

David, I think I would prefer having all 4 tires of the same brand; however, my B2710 came with Goodyear tubeless tires on the front and Firestone tube type on the rear. Of course I have R1 (ag) tires. I never did remember to ask the dealer why; just sort of assumed maybe they put the tube types on the rear in case you want to use some corrosive liquid ballast. And I don't know about the right pressures for R4 tires, but with my ag tires, I'm running 12 psi in the rear, 16 in the front if I'm not using the loader; 24 if I am.






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 05-25-2001, 20:24 Post: 28575
Roger L.



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 mixed R4 tires and PSI

As you seem to suspect, the ratio between the front and rear tire "rolling circumference is critical on a 4wd. Your dealer may have gone to two diffent brand tires to make sure that the original ratio was maintained. It is easy enough to check if you have both sets of tires available, otherwise it does tend to take up a saturday afternoon. I'd assume that the dealer knew what he was doing, but it is always fun to check.
We can start with checking in an armchair fashion. Taking the size information off of your original tires, go to that tire manufacturer's website and obtain the figure called "loaded rolling circumference" for the front and the rear tires. Sometimes this is just called "rolling circumference". Divide one number into the other and save this ratio. We are making the assumption that this original tire ratio was designated by the manufacturer and is a perfect match to their internal front to rear gear ratio. Do the same with the new tires, and compare the new ratio with the old. They should be within 5% of one another.
If you want to dig deeper, there are several ways to determine the actual ratios of both the gears and the loaded circumference.






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 05-26-2001, 18:59 Post: 28601
David LaBrie



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 mixed R4 tires and PSI

Roger,
Unfortunately, I never looked at the size of the Ag tires that were on the tractor so I can't compare them. They supposedly ordered the new wheels and tires from Kubota because they couldn't find another dealer to swap with. I don't have much faith in this dealership. I went to lube the FEL at 10 hours and found 2 of the fittings broken off. They had installed the boom cylinders upside down and the fitting snapped off when the bucket was raised and the fittings hit the frame . I sent this question about the tires to Kubota via there web site but haven't heard grom them.






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 05-26-2001, 19:07 Post: 28602
David LaBrie



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Bird,
I thought the pressure was too high, Hopefully Kubota will answer my email about it so I can set it correctly. When I went to take the cap off the rear tire, a secondary part of the valve unscrewed and started to leak. I tightened it with pliers then was able to take off the cap. Is there anything I should know about this type of valve? I've never seen one like it.






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 05-26-2001, 19:19 Post: 28604
Roger L.



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 mixed R4 tires and PSI

David, the only problem if the tires are mis-matched would be driveshaft windup due to the ratio between the front and rear tire circumference being different from the front and rear internal gear ratio. Usually this will make itself known because the tractor will be very difficult to shift out of 4wd. Of course it is common for there to be a slight mismatch, and for that shift to be difficult.....so it isn't a perfect test. If you have doubts about the tires, then don't use 4wd on surfaces with good traction. My little Yanmar is horribly mismatched and I've run it for almost 20 years because I like the overall tires and stability. (extra wide turfs). I'm careful to use 2wd to travel when the bucket is full and in fact I don't use 4wd unless the traction is too poor for 2wd. When traction is that bad, you don't get driveshaft windup anyway because the tires can slip on the surface. Hopefully you will hear from Kubota.






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 05-26-2001, 21:10 Post: 28609
Bird Senter

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 mixed R4 tires and PSI

David, I'm not sure what you have when you talk about a secondary part of the valve coming unscrewed. If they're tubeless tires, then I assume you have the metal valve stems instead of rubber type commonly found on cars. Of course, the metal ones are fairly common on some truck and tractor tires. And if they're tube type tires . . ., well, usually the valve stem is part of the tube, but there are some that have a separate stem screwed onto a fitting on the tube.






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 05-27-2001, 06:55 Post: 28627
TomG

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I've got valve stems something like those on the rear tires on my Ford 1710. One started unscrewing when a valve cap was on too tight. I just interpret them as extensions and never wondered about them. But then, I do have some familiarity with them. I had them on a '53 Chevy that had very big hub caps. Spinners, they were called. Fashionable in some circles during the late '50's, but you couldn't get an air hose on the valve without the extensions.






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 05-27-2001, 07:00 Post: 28628
David LaBrie



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Bird,
The tires are tubeless and the stem is metal. First you have the base that comes through the wheel. Then screwed to that is the part with the valve core. Then the cap. When I was taking the cap off, the valve core section loosened up and started leaking. I tightened the valve core section with pliers and it seems ok now.
David






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 05-27-2001, 07:00 Post: 28629
TomG

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Sometimes, lifting the front wheels with the loader bucket makes it easier to shift out of 4wd. Most tractors have some lead on the front wheels, so there's always some windup. Lifting the front wheels unwinds the windup I guess. It's good to take a tractor out of 4wd on pavement even if the tire sets are matched.






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Tires Forum

Thread 28572 Filter by Poster:
Art White 4 | Bird Senter 3 | Brent B 1 | CaseyR 1 | David LaBrie 5 | Murf 2 | Peters 4 | Roger L. 6 | TomG 8 |

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