This old John Deere dozer has a failing injection pump. It is a Roosa master pump and I made a temporary fix to it by taking out a fitting that has a small clear glass ball in it. The carbon fiber gears in the pump are breaking down and the small pieces are getting caught in it. This causes a blockage to the fuel tank for the return flow. This causes the dozer to loose almost all power and idle irregular. Filmed September 6, 2021

John Deere 450C cold start/farm work    • John Deere 450C cold start/farm work