(Revision A.) Again, I want to thank yawl for all your kind input. Turns out she died because the injector pump stopped supplying fuel! Don't care to try and remove pump assy from block mtg pad without service manual or witnessing, don't want to mess with timing.
Again, I should have all three manuals delivered before Friday, but noticed a wire exciting through a grommet in that round plate near the traction leaver, but it has been cut short and isn't connected, just wrapped up around the lever handle, and hanging loose...
She wouldn't turn over with traction release, once I returned the lever, she turned over again. There's plenty of good fuel, filter cartridge appears fairly new, so I broke line downstream of filter at pump inlet and had flow.
Broke injector line, but get no flow either by gravity or when turning engine over in start position. Put a little positive pressure in tank, didn't seem to pass-through pump/piston assembly or bleed out 1 of 4 injector outlets. I didn't remove tank return line connection.
I don't see any solenoid fuel shutoff valve, so don't believe there could be any SOS interlock to prevent startups in any transmission position, unless there's some elaborate mechanical coupling connected to pump drive.
Can see that fuel control lever turns swashplate shaft. Is it possible that tank foreign object (rust etc) might have starved pump, if so; is there any way to prime pump, or determine if connecting drive has failed?
Thanks again guys, Charlie in Pea Ridge, Arkansas