Dean, as I recall the single bowl TS-14 used a 6-71 in front and 4-71 in the rear. The tandem TTS-14 was basically a TS-14 with an extra bowl towed behind the first bowl. Each bowl had a rear-mounted engine and drive train. Steering, as with most scrapers, was accomplished by articulating the gooseneck between the tractor and front scraper. The rear scraper had no steering, so backing up was to be avoided. The throttle to the front engine was mechanical, while the two rear engines were controlled by an air-activated servo. So the rear engines were always either WOT or at idle. The transmissions were also air-controlled.
The beauty of the tandem scraper was its ability to self-load in all but the hardest soils. No need for a push cat. You loaded one bowl at a time, which meant the wheels on the other bowl always had traction. The main disadvantage was its length, but for our work we always had plenty of room to work. It was a little tricky maintaining the cut depth with the rear bowl; you just had a couple of pointers mounted to the bowl and gooseneck to give you a rough idea how deep you were cutting.
There are a couple of good pictures of a TTS-14 towards the bottom of the message thread below.
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