Hi, we're in the process of moving a 1933 Speeder B-5 3/4 yard crane home that has a D7700 power unit. Syracuse Supply looked it up several years ago and told us it was the oldest diesel they ever looked up and it was built in the first month of production. Bosch injection pump! Unfortunately the engine was left in the "start" position with all the valves open and the exhaust cover is long gone... She is stuck, but pulling the inspection covers the bottom ends of the cylinders looked good I remember. We had the pony popping but ran out of time and cranking energy. I think a new set of plugs is in order.

Anyways... looking for a service manual/parts book for D7700, any parts interchange info, etc. advice, do's and don'ts in dissassembly and reassembly and Speeder B-5 crane stuff. Speeder crane has 35' channel iron boom in need of 3/4 yd + or - clamshell and dragline buckets or?! Thanks for any help, Larry

I don't have any info on the D7700 other than it shares the same 5-1/4 bore and 8 in. stroke with the D6100 and D11000......equally obscure engines:)

The first Industrial D7700 was 4C6501, built March 1933.