Kubota tractor tire leaking only some of the time: Kubota Review  -- Kubota Tractors Discussion Forum and Review Kubota tractor tire leaking only some of the time: Kubota Review -- Kubota Tractors Discussion Forum

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 04-16-2008, 19:12 Post: 153034
gball7

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 Kubota tractor tire leaking only some of the time

Folks,
I bought my new Kubota BX2350 a couple months ago and have done some good mowing and FEL'ing so far. Great machine.

But I took a nail in the tire last week, had it successfully plugged at a tire store, and have done more good work with the tractor since.

The situation though is that the tire was slightly underinflated from the tire store once I had the full weight of tractor, FEL, 60"MMM and rototiller on the back on the tire...so I went to top it off with a little more air this evening.

When I removed the tire pump hose, the valve (the rubber part where it meets the rim) made a slight hissing noise. It does it when I move the stem slightly off-center in any direction-- more hissing in a couple direcions around the clock- like 9 oclock and 12. The tire is not losing air as long as I don't touch the stem, but I'm still worried about longevity of the tire with this situation.

First off, anyone know if there's a way to 'plug' or repair a stem (the tight area where it goes through the little hole in the rim) at home (DIY)? If not, I assume I'll be getting out the jack and stands again, removing the wheel again, and having the tire re-stemmed in town.

Thoughts/ideas?
Thanks,
Mike in NC






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 04-16-2008, 20:36 Post: 153039
kwschumm



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 Kubota tractor tire leaking only some of the time

I worked in a tire store for a few years and leaky stems were always replaced. I've never heard of a way to repair them.






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 04-17-2008, 09:15 Post: 153058
Murf

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 Kubota tractor tire leaking only some of the time

Mike, Ken is on the right track, valve stems are both cheap and problematic, so it's best to just replace them.

In your case though it would be a PITA, and most likely the problem is a bit of rust or dirt around the opening in the rim where the stem comes through.

There is a trick that might fix it though, use the FEL to lift the weight off the front end, let all the air out of that tire and put some warm water with a little dish soap in it around the stem and then gently push the stem and pull it out a bit while you spin it around in the hole. This will often clear whatever it is that's letting the air leak past. After you've done this air it back up and look for any sign of bubbles in the soapy water, if there is repeat the process until there is none.

Best of luck.






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 04-17-2008, 12:48 Post: 153063
gball7

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 Kubota tractor tire leaking only some of the time

Thanks for the comments, guys. Murf, would doing this with the stem (twisting it around) mean that the stem would still need to be replaced afterwards? If flecks of metal exist in the stem hole, might they sever the rubber in the stem, causing it to leak more? Or you're saying that this could actually fix the problem?? How fragile is the rubber on these stems usually? Don't mean to question your methods, I just picture this thing being very fragile.






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 04-17-2008, 13:24 Post: 153067
kwschumm



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 Kubota tractor tire leaking only some of the time

Valve stems are pretty rugged, you won't do any more damage trying Murf's method unless the stem is so dried out and cracked it crumbles (and you'd have to replace it anyway if that's the case).






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 04-17-2008, 13:27 Post: 153069
kwschumm



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 Kubota tractor tire leaking only some of the time

By the way, if the hole is really corroded you could try a metal stem. They crank down with a nut and might seal where a rubber one wouldn't. I generally avoid metal stems, though, they have no resilience so if the stem hits a heavy branch or rock it could get damaged where a rubber one would bend and rebound.






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 04-17-2008, 14:46 Post: 153072
Murf

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 Kubota tractor tire leaking only some of the time

As Ken mentioned, the stems are pretty tough.

If the leak is at the stem, fixing it permanently doesn't have to be a tough job, especially on a front tire.

If the problem is just debris, my suggestion should work fine. If the problem is rust, you will need a more permanent solution, or get used to doing what I suggested every so often as more rust accumulates.

Some people have had good luck with those slime products you put in the tire, I've never had much luck with them personally, but then I've never given them a good try either.

If the problem is rust, to fix it properly the tire should be dismounted, the rim cleaned and the paint touched up, and the tire put back on with a new stem.

Best of luck.






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 04-17-2008, 15:48 Post: 153077
kthompson



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 Kubota tractor tire leaking only some of the time

Ken, Murf, is the front tire so hard to break loose from the rim he could not do that and replace the valve stem with the tire still on the tractor? I have never broke loose a lug tire that small but would think he should be able to with large rubber hammer. Then he would have access to both sides of the rim to clean it or replace the valve stem. kt






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 04-17-2008, 16:04 Post: 153082
kwschumm



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 Kubota tractor tire leaking only some of the time

Quote:
Originally Posted by kthompson | view 153077
Ken, Murf, is the front tire so hard to break loose from the rim he could not do that and replace the valve stem with the tire still on the tractor? I have never broke loose a lug tire that small but would think he should be able to with large rubber hammer. Then he would have access to both sides of the rim to clean it or replace the valve stem. kt



My sense is that the beads on tractor tires don't seem to lock as tightly as automotive tires. The profile seems different but I haven't examined them in detail. So it might be possible to deflate the tire, break the bead and change the stem yourself. I've never changed a stem without the right tool, though, it might be a challenge without something that threads onto the stem to pull it through. And the idea of laying the tire flat and flailing away with a sledge to break the bead brings back too many memories of working with split rims. Then there's all the fun you might have spreading the beads and getting them seated again. If it were me, and Murf's simple solution didn't work, I'd take the mounted tire to a shop to have it fixed (if it's not loaded) or call an on-site tire service to fix if it is. But then again as the years have gone by I've become lazier Smile






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 04-17-2008, 16:12 Post: 153083
DennisCTB

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 Kubota tractor tire leaking only some of the time

This a brand new tractor so rust or dry rot rubber should be an issue.






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