I am not a experienced hydrolic mechanic. I was apprehensive about replacing the pump and reservoir as well as rebuilding a hydrolic cylinder in my dump trailer. This power unit was exactly what I needed. The instructions were a little difficult to understand but with persistence I got thru it. This unit performs like the original at less than half the price! The reservoir is a heavy box compared to the original. If you know what you need, these power units will do the job!