Need help Cummins 855 big cam injection pump sticking

Sounds like the throttle rod or pedal is hanging up. The throttle shaft on the pump will not return to idle on its own without a return spring with or without linkage. Remove linkage from the shaft arm and leave return spring on. See if it acts normal. If it does then you need to work on the linkage and/or the pedal to free it up. Check the bell crank pivot point on the cab those things get worn and the bushings get wallered out and sticky.

 

Some cab overs had a issue with the linkage. Had to watch how it was working as the cab came down. Flip part of the linkage when the cab was about half way down. If not they would start at full throttle.
Does it low idle with the cab up?

 

Just FYI if ya aren’t aware. NEVER lower a cab over down with engine running!

 

Boy……. Does this thread bring back memories with my COE K100.