Just this past year I was working on my Farmall 560. It's a diesel and uses the old Roosa Master pumps. I had to replace the $5 umbrella seal. Pulled it, changed it and reinstalled. Turned the motor over and saw the pump warble. I knew something wasn't right. Pulled the pump and realized I just sheared the pump shaft and trashed my injection pump. NOW I know you MUST have the throttle fully open when putting it back on the pump shaft. Several hundred dollars and a few weeks later I got it all back together. THAT is a mistake I will not make again.
