Power Systems International (PSI) is a company founded in 1998 in Rockford, Illinois, specializing in advanced machinery design, integration, and manufacturing for fluid power production equipment, drives, and fluid conditioning systems. They focus on hydraulic drives, lubrication oil conditioning, and process control, offering design, manufacturing, service, and support of equipment. PSI differentiates itself by supporting manufacturing, representing major hydraulic component manufacturers, and providing application and integration services beyond fluid power systems. They work closely with heavy mining equipment manufacturers to enhance service and support for machinery, and maintain long-standing vendor partnerships. PSI's core services include fluid power solutions, motion control components, and systems integration for a variety of industries.