Working on a super dexta now. You mystery line should hook to the fuel shutoff. Dextas didnt have a sediment bowl. They had a shutoff with a primer built in for cold starting.
The small line to the intake squirts diesel onto the heating element in there and the engine then sucks in flaming diesel fuel to help it start.
The shutoff is available for around $120 online. Mine is broke but I'm going to try to repair before I spend $120.
I believe the throttle return spring is in the injector pump. There is a friction washer setup to hold the throttle where you want it, but it should return to idle if its slipping. As a note, mine has the mechanical governed pump and I assume you have the pneumatic, so yours might be different.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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