Harbormaster Bow Thruster and Marine Propulsion Outboard Drive Systems are constructed of the highest quality marine parts resulting in unsurpassed durability. We use tapered roller bearings, special seals, pressurized oil for lubrication and cooling, SAE 4140 steel shafting, precisely engineered shim sets, bronze components, and other premium features. Simplicity of design reduces incidents of repair and minimizes costs when repairs are necessary. Barge and Ferryboat Propulsion Drive Systems are common applications for the Harbormaster Marine Outboard Drives. Harbormaster Marine, Inc. also maintains spare marine parts to service all Murray & Tregurtha / Harbormaster marine propulsion equipment. Customers worldwide benefit from Harbormaster Marine's top notch and world recognized Service