Posted by showcrop on October 13, 2018 at 15:49:22 from (75.68.37.174):
Our Fire Department's new 3,000 gal. tanker is on a Peterbilt Chassis. It has a disturbing behavior that we are having problems getting resolved. When under light acceleration at around 35 MPH, if you hit a bump it will start a jumping movement that seems to have a kind of forward backward motion to it. It makes me think of how older loader backhoes would get to pitching forward and back on the road or how a tractor with a heavy drawbar load like a manure tanker could get to "galloping" It has done it to me twice and has done it to others too. You have to hit the brakes and slow right down to stop it. The truck has some electronics that sense motion, and intercede to prevent a crash. If you are rounding a corner too fast you loose power until you slow down a little. Peterbilt did some front to back leveling on it and sent it to the tire store and got the tires checked out, but no resolution yet. They had it for four days this week. Any ideas?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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