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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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