DIESEL MECHANICS...HELP

[PRO]

This isnt a mopar question but I'm a mopar lover.I have a GEHL skid loader w/4cyl diesel that bogs down every 10 minutes or so.I've changed the fuel filter regularly and run fuel cleaner thru it too,its not overheating and Ive cracked loose each injector line while running and it drops rpm so it seems like every cyl is firing...HELP....thanks...PRO...

[karl]

Pro, have you checked the fuel line to make sure it is not collapsing when the fuel is heating up? When was the last time you ran the rack? Did you check the pump timing? Sounds as though you have a pump problem. What is your pump pressure. How many hours on the engine? Normally a bog is a fuel problem and there is not much to your system. If the pump is dying, it will cause this problem even though it appears to be working, the valving could be going bad.