I was at my lake house this weekend and put the pin back where it belonged in the linkage to the governor rack in the access port that has the breather hose on it. I hooked a thin wire around the pin before trying to install it so that if I dropped it I would not have to remove the pump to hopefully retrieve it from inside the block. Then I grabbed the pin with straight forceps that were 5” long the kind with the ratchet hold close. (I think 8” curved forceps would have been better but I could not find them locally.) The 5” forceps worked well and the pin went right in. I then removed the safety wire I had installed and then unlocked the forceps releasing the pin. After my usual routine of bleeding the air cock on the injector pump while cranking then closing, removing the injectors from the top of the engine and cranking until a solid stream of fuel then reinstalling the injector then bleeding the air out of the air bleed cocks on the top of the cylinders while cranking then closing. She stared right up.
The culprit that started this 1-1/2 year fix was the throw out bearing that was installed without a carrier (previous owner) which caused lots of smoke, lots of high pitched squeals, and a lock up of the clutch, After the tractor split and a new clutch, clutch plate and installing a new bearing with a new carrier and solving the run-away problem, my Yanmar 1500D runs well and the drive train works great.
Thanks for all the help from the Forum.