> Delco decided to design a push-pull self loading DE scraper using a single 6V71 or 8V71 (or 92 series) in the front driving a DC generator and using an electrical transmission with 250 HP EMD traction motors F $ R (not sure how steering was accommodated). A single prototype was build by modifying a current design twin engine scraper but the design was never commercialized because the end of the interstate highway system was on the horizon and marketing decided that resources could be better spent elsewhere.
Dean, most scrapers use articulated steering, although some have come out with steerable front ends. John Deere made a few that way, I know.
I wonder if there are any diesel-electric scrapers in production. It looks like Caterpillar uses mechanical drivetrains for all their models, including the big 44 yard 657. Scrapers can't really use the high torque a D-E drive can provide, because they'll just spin their tires. You try to keep your speed up and take a small cut to avoid spinout. In the scrapers I used, first gear didn't get much use.
LeTourneau had an interesting take; their machines used electric motors, not for propulsion but for steering and operating the elevator. We had a C-pull, which was horribly unreliable; another nearby contractor had a pair of the larger B-pull scrapers, which I suspect were even worse. Instead of steering wheels, the LeTourneau scrapers just had a toggle switch on the dashboard to steer. There was a bar across the dash to hang onto so you didn't fall off. The pipes for the screaming 8V71 Detroit were right next to the operator; if you weren't already deaf when you started work, you would be at the end of the day.
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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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