Cat 920 Wheel loader

I have an issues with a Cat 920 S/N 62K12538. It has a 3304 engine in it. It has a manual fuel shut off that has (for lack of better words) lost the detent in the foot feed. So basically when I take my foot off of the accelerater peddle the engine dies. Initially I thought the detent was incorporated in the throttle linkage though I can't see anything in the linkage that would indicate that. So, I'm assuming if it's not in the linkage it must be a function of the injection pump. If so,...

Cat 920 Wheel loader

Cat 920 Wheel loader