V50D forklift No power
 

Hi
this is a shot in the dark, but I have a forklift with no power. None of the local mechanics can figure out why but I don't think they got into it very deep.

Its a V50D Cat with a Diesel Indinor motor.( not sure what brand that is but I thought French). The motor starts (when I have good glow plugs in it) and runs fine out of gear, but just has no power when moving.

Just wondering if anyone is familiar with the injector system on these and where I would start looking to test everything

thanks