It's been a long time sence I have worked on injection pumps or injectors. I don't have the tools anymore. I belive you have a 600 Terratrac with a 208 Continential diesel motor. They have a PSB diesel pump. They stick and will break some internal parts for sitting short periods of time.
Parts are hard to get.
I may be able to help if it is the pump. I can't find this info. What HP also. The pump seems to bleed out ok, but I get nothing at the injector lines. It's been a long time sence I have worked on injection pumps or injectors.