Bobcat 743 runway help!!

[Rhion008]

Bobcat 743 kabota v1702 year unknown has been sitting for s couple of years.
Before startup: changed all fluids and filters drained fuel replaced new fuel
Primed fuel system .hard starting but when it fired up it maxed rmp (diesel runaway) had to cut fuel line to shut down can anyone point me in right direction or possible causes thank u

 

[Ster1]

Kubotas don't runaway. You may have leaky injectors, injector pump wide open, something like that. I'd start with the injectors.