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Tires and tubes

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Lanse

01-26-2008 20:15:15

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Everything here refers to my post a little bit down the line:

The air is coming out of the center of the stem. It is where there is a little metal button on a normal one, and you hit the button with a wire or something to release the air. This has no button, its missing. Flashback, what were you saying about patching the rim?? Where do you get that stuff?? Thanks guys.

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skyharborcowboy

01-27-2008 14:00:26

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Re: Tires and tubes in reply to Lanse, 01-26-2008 20:15:15

The Schraeder valve core is on used to keep air in the tires while filling it. The real seal is actually on the cap that covers the valve stem that the Schraeder valve core threads into. A real cap is made of metal and has a rubber seal at the top that seals against the valve stem!

Joe

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135 Fan

01-27-2008 13:47:51

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Re: Tires and tubes in reply to Lanse, 01-26-2008 20:15:15

The valve core probably got eroded away and there is a possibility that the threads and/or the valve stem itself is damaged and a new core isn't going to work. You can get a tool to try to repair the threads and get some new valve cores and try however, as they are both cheap to purchase. The tool I have is a 4 in 1 valve tool and they only cost a few bucks. Dave

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Janicholson

01-27-2008 07:00:44

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Re: Tires and tubes in reply to Lanse, 01-26-2008 20:15:15

Danger hear again, with the rim damaged, we cannot recomend you putting air in it at all. I have seen windows blown out of houses 80 feet from tractor tires that have blown out its rim flange.
The tire must be taken off.
The rim must be wire brushed with an electric rotary brush.
The metal must be checked for thickness and rust pitting throughout the whole inner surface.
All thin spots would weaken the rim.
If only one spot is rusty, and the spot is smaller than a quarter when trimmed back to good sound metal, would I say OK to putting a fiberglass polymer repair on it.
Show us pictures when it is clean and bright, then we can assess the reality of the safety of your intentions. The others are correct on your need for a valve core, but do not use it until the rim is clean checked and repaired. The valve stem tool that is needed is also a reamer rethreader and remover wrench (cost is about 3.00) JimN

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Mathias NY

01-27-2008 07:28:43

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Re: Tires and tubes in reply to Janicholson, 01-27-2008 07:00:44

I definately agree with the danger aspect. Posting a picture of the hole in the rim would help us understand the situation better. If your goal for now is just to get the tire inflated enough to move the tractor around the shop, replacing the core and adding 5 psi shouldn't be a problem. Full pressure as indicated above, could be dangerous.

As for the fibreglass, depending on the hole size it might not be worth the effort. For a large hole you might spend $15-$25 on fibreglass and other supplies and put a lot of work into a rim that may never look as good as you wanted. New rims are only about $60. What you do will also depend on your budget, skill level, time, etc. Replacing the inner tube during this process is also a good idea.

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Texasmark

01-27-2008 05:58:01

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Re: Tires and tubes in reply to Lanse, 01-26-2008 20:15:15

And it is a Schrader valve, named after it's inventer and is THE valve used in all tires up to and including OTR truck tires; one size fits all.

There are 2 seals to lock in the air. One you see as the black ring in the picture. To see the other, push in on the pin and on the right side of the pic, the bulge moves out and the second seal is there.

If either are damaged, or loose, the stem will leak.

Mark

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iowa_tire_guy

01-27-2008 16:32:32

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Re: Tires and tubes in reply to Texasmark, 01-27-2008 05:58:01

Actually OTR (Off The Road)tires use a valve core that looks the same but is much larger than the regular valve core. Also the floater tires that fertilizer spreaders use use the giant valve core.

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335LP

01-27-2008 09:29:38

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Re: Tires and tubes in reply to Texasmark, 01-27-2008 05:58:01

Maybe one size fits all on smaller and most on the road tires but many larger rear tractor tires use a larger stem and valve core. Same valve core with different seals and large and small one use in AC industry also.

Tire repair tools

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Texasmark

01-27-2008 17:00:28

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Re: Tires and tubes in reply to 335LP, 01-27-2008 09:29:38

My 100 PTO JD 4230 with 18.4/38's use the same stem as my riding lawn mower and everything else on the place including all my farm machinery....course my biggest tractor is 100 hp so my machinery is sized accordingly.

Can't comment on Open Strip Mine dump truck tires; never got close to one.

But I'll tell you this. On the big tires it takes all day to fill thru that little hole. So what I do is pull the stem and put air in with out it and then keep putting it back and testing the pressure and all till I get close to the desired press and then finish it off in the normal fashion.

So if I lied, I'm sorry.

Mark

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iowa_tire_guy

01-27-2008 19:54:24

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Re: Tires and tubes in reply to Texasmark, 01-27-2008 17:00:28

Your right that farm tractor tires use the same core with what is called an inner stem that the core goes into. I don't have the patience to inflate them through the little hole so I do like you and use the big one. I just overinflate the tire and catch the pressure I want on the way down.

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old

01-26-2008 20:48:08

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Re: Tires and tubes in reply to Lanse, 01-26-2008 20:15:15

Lance go to a tire repair shop and ask them if you can watch the guys work for say an hour. Keep your eyes open and your month shut and you can learn a lot. Sounds like you have no idea of what a tube, rim or valve stem is, or valve core is. The picture the other guy posted is a core it goes into the stem and its an air valve. If its bad air will leak. But theres other things that can do that and pretty much seem to be the same thing

Hobby farm

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Greg_Ky

01-26-2008 20:33:30

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Re: Tires and tubes in reply to Lanse, 01-26-2008 20:15:15

Lanse,
this is what you need inside your valve stem. It is a valve stem core:
third party image

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