GMR & PMR Gearbox Pump Assemblies

Simplify your pressure washer installation with professional GMR (Gearbox-Mounted Reducer) and PMR (Pump-Mounted Reducer) assemblies that combine gearboxes and pumps into ready-to-install units. Our selection includes General Pump, AR, and Comet assemblies in multiple GPM configurations, providing complete power transmission solutions for belt-drive pressure washer systems.

Complete GMR & PMR Solutions

• GMR Assemblies: Gearbox-mounted reducer units with integrated pumps for compact installations
• PMR Assemblies: Pump-mounted reducer units with gearboxes attached directly to pump heads
• Flow Rates: Assemblies available in various GPMs for various pressure washing applications
• Major Brands: General Pump, AR (Annovi Reverberi), and Comet assemblies for reliable performance
• Pressure Ratings: Units rated for 3,000 to 4,000+ PSI commercial applications
• Replacement Parts: Seals, rebuild kits, and components for GMR and PMR maintenance

Whether you're building a new hot water pressure washer, replacing a complete pump and gearbox assembly, or upgrading to a higher flow system, GMR and PMR units provide pre-assembled, properly aligned power transmission. The integrated design eliminates alignment issues, reduces installation time, and ensures optimal pump speed for extended service life in demanding commercial pressure washing operations.

Looking for standalone components? Browse our pressure washer pumps and gearboxes & gear reducers. Need parts? Check out our pump replacement parts and complete product catalog.