|Dump truck with tires off|
|View of groove for dog and valvestem|
|This block should be welded to front edge of wheel such that the valve stem will cradle in recess. It keeps the valve stem out of trouble, and keeps the wheel from spinning on the hub.|
|the weld bead is there, but it didnt' stick to the wheel. A pretty clear case of incompetent welding.|
Sometimes a little sloppy work by a welder can cause a lot of grief. Some years ago we acquired this brand new tire and wheel at a going out of business sale from a major manufacturing company. They likely had inventoried it as a spare tire for something, but had never used it. We bought it and it sat around for a few years until we needed it. Then it was mounted as the inner dual on this dump truck. We felt pretty good at having a new tire for an old truck.
Our happyness didn't last very long as it was soon flat. Getting the wheel off the hub was a dog as it was jammed there. The block that is suppose to keep the wheel from spinning on the hub had come loose allowing the wheel spin, and of course the valve stem did not survive this as the block is suppose to protect the valve stem which should reside in the saddle of the block. The wheel was spun and jammed out of position. After much frustration, we put a roll hitch on the tire with the long nylon strap around the radius of the tire and successfully rotated the tire and wheel back to where the remainder of the valvestem and the loose block were visible in the groove on the hub. We were then able to slide the tire and wheel off the hub in the normal fashion.
The final three photos show the cause of the the problem. Who ever welded the block on the wheel did so very badly. The weld didn't stick to the wheel. You can see the part that is fresh broken and it is so insignificant its a wonder the block didn't just fall off. All in all it won't be too hard to fix, but changing those tires is a lot of work, and the flat tire will need a new valve stem which means that a substantial tire has to be dismounted. Not a lot of parts involved but more than a little labor is involved. I'll never know who did the bad welding which is probably just as well.