WHY!!

grandpa Love · Sep 29, 2019

About 2 months ago I posted about a tire shop putting a new tube on a rusted 8n rim and tire going flat over night. Well....I fixed the rim and patched the tube. Tractor has been driven a good bit since then, but for last 3 weeks it's been sitting in the barn, 2 days ago the tire went flat!!!! Tried to air it up and air is pour out around valve stem faster than it's going in tube! Why oh why???

Janicholson · Sep 29, 2019

The pain is tremendous. The original leak may be assured to be on formerly rusted metal. The tube was, for sure, placed on that same place, clocked by the valve stem location. Patches often take a while to unstick. The patch is not as stretchy as the tube and doubles the tube thickness (or more) when expanded in the tire, that difference allows the tube to peal away around the patch and leak. Pits in rims I must salvage get filled with "bondo" and allowed to cure out before remounting. Jim

grandpa Love · Sep 29, 2019

Are bigger patches better? Biggest ones I can find are about 2 inch circle.

RBnWA · Sep 29, 2019

Grandpa Gemplers will have bigger patches. They have tire supply s. RB

Janicholson · Sep 29, 2019

Thinner around the edges and big are best. Letting the cement dry is critical. Buffing the tube so it looks rough sanded is critical. using a roller on hard surface to smash the patch into a good bond is critical. letting it cure in for 2 hours with a weight on it is best practices. Jim
one type

blue_tractor_man · Sep 29, 2019

Maybe the tube is made of Chinesium. I've had those go bad just sitting. I have a chicken pen on wheels. Tires amd tubes from Tractor Supply kept going flat. Got my tire dealer to order me some Firestone tubes. Never gave me another minutes problem.

grandpa Love · Sep 29, 2019

Nah.... clearly says made in Korea!! Lol

Bruce from Can. · Sep 29, 2019

I no longer will patch a tube that goes into a rear tire. For the price of a new tube vs the time and labor to remove the tire, I have better things to do.
One thing you may want to consider. Is there anything imbedded in the tire itself? I have seen tires with buck thorns stuck in the rubber. You can?t feel the thorns from the inside of the tire when you run your hands around inside. But when the weight of the tractor rolling and flexing the rubber, works the thorn against the tube, and puts a hole through. Chalk the tire before you remove it from the rim, and check the leak in the tube as compared to the location it would have had in the tire.

jeffcat · Sep 29, 2019

You have it nailed down. Squish them good to get that bond. Instead of rubber cement I use Weldwood contact cement. Bonds a lot stronger for me. Only thing I would add is give the tire a sqwirt of baby powder. Lets the tube and tire settle in nice and free and easy. This past week end I found this at the flea market. The can was the size of a half gallon bottle. Two pounds Big!

Geo-TH,In · Sep 29, 2019

I had a rusty rim. My tire shop recommends cleaning rust with metal conditioner then coating with flex seal to remove sharp edges.

Mine has lasted for a few years now

Tire shop also washed all the crap that collected inside old tire.

Don't know what I would do without a good tire shop that works on farm tractors.

ss55 · Sep 29, 2019

Cenex ( a Midwestern farm co-op) carries larger patches, around 6 inches square. Check with any store that sells ag tractor tires or construction tires.

r.w.b. · Sep 29, 2019

Check insides of tire thouroghly,as said above 1 thorn not visable spells trouble.i always mark tire to valve stem hole,thus air tube up for reference of something in tire.if its rim its obvious. Sounds like a tube split.might be a hi quality chinacn tube

Traditional Farmer · Sep 29, 2019

Is that the rim you put duct tape on? My tire guy when he patches a tube will really scuff the tube then applies the glue,tire cement or whatever its called takes a lamp and lets it heat and dry for a couple minutes before putting on the patch which he vigorously rolls down on the tube.Never had a problem with the ones he patches.I'd never use a patched tube if I was going to add fluid to the tire.

JD Seller · Sep 29, 2019

The other posters have most of what could be happening covered. I have found that the new tubes are not very tough. Especially the Asia made ones. I mounted a 20.8 x 38 tire on a tractor that is setting in the shop that is getting the motor rebuilt. The tire set there for weeks and then went flat. Would not take air fast enough to lift it so I could get the tall jack under it. I found that the tube had a split in it about two feet long. Looks like it was right along where the tube is put together. It was a cheap tube that the local tire shop gave me as warranty on this tire after they "fixed" it three times. I ordered a US made tube and that has been holding air since then.

Trick I have found that really helps on these modern tube to make them take and hold a patch better, is to warm the tube with a heat gun before applying the patch glue. Then dry the glue with one too. Put the patch on while the dried glue is warm. Then heat the tube and patch up after it has been put on. This stopped the patch from coming off the new tubes that are not as good of rubber as we used to get. A hair dryer would work too.

Eldon (WA) · Sep 29, 2019

I use a 3" angle grinder and carefully go over the area with tube inflated until any seams or wrinkles are buffed out. Let air out. I then apply rubber contact cement on the area larger than the patch and make sure it is dry before I stick the patch on and then rub it from the center out. Little round patches with feathered edges work great for me.

Papaw8 · Sep 29, 2019

I have had patches come loose until I started using liquid buffer. I now scuff the tube and then use the liquid buffer and apply the cement. Next I use a heat gun and heat the area then apply patch. Roll it down then apply heat and roll it again. Haven't had any more come loose.mabye the liquid buffer or the heat, but it works for me. Some day I'm going to try that without any cement and see what happens.

old · Sep 29, 2019

I've had more then one of these new thin tube go like that is due to a seam ripping open just out of the clear blue

Jim in NC · Sep 29, 2019

Grandpa, following R.w.b's thoughts, I have had many thorn or briar flats over the years on front tires. They can be very hard to find, and I believe the thorns work towards the tube over time by using the tractor. I have had to dismount a tire more than once to find the trouble. What I do if I suspect a thorn flat is to use a soft rag and slowly rub the inside of the tire. If a thorn has pushed through I will find it.

WGM · Sep 29, 2019

Last Firestone tube I bought was made in China.

grandpa Love · Sep 29, 2019

I felt around inside the tire and can't feel anything sharp I ever blew up a latex glove and ran it around in there nothing!.......

caterpillar guy · Sep 29, 2019

I pump up the tube buff then patch the tube is slightly stretched that way and the patch will still stretch some to accommodate the tube.

ramblineagle · Sep 29, 2019

JD seller when I have to buy a new rear tractor tube I only get a radial rated tube that is made in Korea. They are a thicker and heaver tube than any other made tube. Yes you can use a radial tube in a bias ply tire with no problem.

WHY!!

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