> Long ago I watched one of these Letournau scrapers working. One operator, several engines driving electric motors. Must not be efficient, never have seen one since.
Letourneau (later WABCO) built a lot of heavy equipment with various types of electric drive. My dad had a "C-Pull" self-loading "paddlewagon" scraper that used electric power for steering and to operating the scraper paddles, but used a conventional manual transmission behind a single 8V71 Detroit. The Hancock scraper bowl had hydraulic cylinders for height and ejection. Steering was accomplished by a single toggle switch on the dashboard that activated a huge motor in the gooseneck.
The Tournapull scrapers were notoriously unreliable, but it wasn't an electrical failure that finished off our C-Pull. The differential ring and pinion shelled out, and it just wasn't worth the cost and aggravation to repair.
We later got a Euclid (later Terex) TTS-14 tandem bowl scraper, similar in design to the three bowl Letourneau in your picture. The TTS-14 was based on the single bowl TS-14 and was powered by three 4-71 Detroits driving five-speed Allison powershift transmissions. Compressed air controls were used to operate the transmissions and hydraulics. The front engine had a mechanical throttle, while the mid and rear engines had air throttles with two positions: idle and full throttle. This was a very efficient machine anyplace big enough to use it, since it could do the same amount of work as two conventional scrapers and push-cat.
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