The largest single factor I've found in dealing with radial tires is the load they're carrying. To give you any kind of answer on inflation pressure we'd need to know the weight being carried by the rear axle. That includes the weight of the plow, the weight the plow transfers to the rear axle, and the weight of the tractor normally transfered to the rear axle. This is not just a simple matter of static ballast as it's sitting in the yard but a matter of the transfer that takes place when you lift that plow or it digs in hard and pulls down on the back of the tractor. You could be in a situation at times where you have 95% of the tractor's gross weight sitting on the rear tires plus the weight of the plow, plus a pile of draft from it digging in the ground.
A simple answer is that if you're pinching tubes or turning the tires on the wheel and shearing the valve stems off, you need more air... I run a mounted plow on mine and run the air up to about 18 psi to aleviate those problems... and I do have problems if I don't air them up. I've pretty well made up my mind to run them dry when I get new tires in the spring. The CaCl is going to sit in the barrels while I try it without. I'll add steel ballast if I need it.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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