+1 The only way you would be able to stall the engine at 2500RPM when dumping a load is if you had your foot on the brake and Hydrostat at the same time trying to move. As far as overloading the loader, don't worry about that I push mine hard and they will handle it no problem. Sounds like a fuel issue, bad fuel or water will mess with a diesel bad. Be sure you get your fuel from a high use station or you will find out just how many problems you can have. CJ