A service pack, in certain embodiments, includes an engine, a variable displacement pump coupled to the engine, and a controller configured to control displacement of the variable displacement pump in response to a load condition associated with the engine. A method of managing power of an engine-driven system, in certain embodiments, includes sensing a load associated with an engine coupled to a variable displacement pump. The method also includes adjusting pump displacement of the variable displacement pump in response to the sensed load and one or more limits associated with the engine.