Your first statement is true unless it is different. I spent over 40 years in the transport business. Almost every single axle tractor I have seen is set up with the pin 9-12 inches forward of the axle center. Reason being to throw some weight onto the steering. If the pin is directly over the axle, pulling force tends to lift some weight off the steering. Can get rather snaky on slick roads. Same theory applies to tandem tractors, but not so much. Tandem tractors are set up to pull heavier, so have larger (heavier) engines, larger fuel tanks, & often a sleeper, so already heavier on the steering. I liked my pin set at 3 inches forward of tandem center. With that model tractor, road ready, full of fuel,double bunk sleeper, me in the seat & my personal gear on board, when I scaled 34000 on trailer, 34000 on drives I had 11800 on steering, just right. In the tractor-trailer or truck-trailer debate, it depends on the type of use. At one feed mill I delivered to often, they had tandem box trucks pulling a 16 foot pup when delivering to their dealer elevators/feed stores. After the first 1 or 2 stops, driver would let the empty pup sit, finish route with truck, then pick up the pup on return. Beat the heck out of unhooking the pup at each following stop, or opening door in nose of pup & setting bridge ramp from pup to lead truck for unloading. If it was a circular route instead of a straight out/back route, they couldn't let the pup sit. Then they discovered that by switching to tractor -trailer that when empty at end of route, they could pick up grain or other mill supplies on the return trip.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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