IH trucks particularly the extreme heavy duty Paystar line may be kind of odd balls. If it is like most of the truck with air brakes of that era the part you are looking to do the adjusting on is called the ..slack adjuster.. In the link the 3rd diagram down the example to the right ..type II.. is the most common type I came across working on a few hand fills of heavy duty trucks in the 80s and 90s. The slack adjuster is where you adjust the brakes. I believe the adjuster hex size was 9/16 inch wrench. Around the hex is a locking collar you push in and then turn the adjuster hex to tighten or loosen the brakes. I believe it follows regular bolt thread left loose and right tight. I suggest you first try adjusting one that already is released to get the feel of how they work. If the adjuster has pressure on it they can be difficult to turn.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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