Himore Pressure Washer Pump Replacement — 2800 PSI Vertical Pump, 2.3 GPM for Black Max BM80913/BM80919

The Himore ROP Shop 2800 PSI Power Pressure Washer Water Pump is a vertical replacement pump rated to 2800 PSI and 2.3 GPM designed for Black Max BM80913 and BM80919 style units.

This replacement pump provides the core components—chemical injector, unloader valve, thermal release valve and outlet tube—needed to restore cleaning pressure on many small-engine pressure washers. It installs as a vertical, rear-facing pump and is intended for hobbyist and light-commercial machines that require up to 2800 PSI at 2.3 gallons per minute. Before ordering, check your model specifics and engine shaft/bolt configuration to ensure proper fit and to avoid returns.

How do I confirm this pump fits my pressure washer?

Compatibility depends on mounting pattern, shaft size and engine configuration. Compare the pump’s physical specs to your unit and provide your model details to the seller for verification.

• Measure shaft: 7/8" diameter required.
• Confirm 3-bolt pattern: 7 11/16" x 6 3/16" x 6 7/16" with 4" center to each outer hole.
• Check inlet/outlet orientation: rear-facing vertical mount.
• Verify engine power: minimum 5.5 HP recommended.

What performance and pressure specifications does this pump deliver?

This pump is engineered for a maximum working pressure of 2800 PSI and a peak flow of 2.3 GPM, suitable for household and light-duty commercial cleaning tasks. Operating within these limits preserves pump longevity and safety.

• Maximum pressure: 2800 PSI.
• Maximum flow: 2.3 GPM.
• Max pump speed: 3400 RPM.
• Maximum water temperature: 140°F (60°C).

What installation details and hardware should I prepare for?

The pump ships with the pump body, chemical injector, unloader, thermal release valve, outlet tube, hose and keyway, but you may need longer bolts or spacers depending on your engine and frame. If the engine shaft is longer or pump legs contact the frame, use the appropriate spacers to prevent stress on the pump legs.

• Included: pump assembly, chemical injector, unloader, thermal valve and outlet tube.
• Common extra hardware: (2) 5/16"-18 x 2-1/2" and (1) 5/16"-18 x 3-1/2" bolts; spacers/washers sold separately.
• Note: pump head can be flipped; some engines require pump removal to change oil.
• Do not exceed maximum rated PSI to avoid damage or injury.

How does maintenance and safety work with this pump?

Basic care preserves performance: use clean water, avoid running above rated pressure, and ensure thermal release functions correctly to prevent overheating. Follow general pressure washer safety—secure connections, inspect seals and replace any damaged hoses or fittings.

• Use recommended water temperature (max 140°F).
• Do not run pump above 2800 PSI.
• Inspect unloader and thermal valve periodically for proper operation.
• Replace worn seals and hoses promptly to prevent leaks and damage.

Who is this for: This Himore ROP Shop 2800 PSI pump is aimed at DIYers, small contractors and owners of Black Max BM80913/BM80919-style pressure washers who need a reliable vertical replacement pump with integrated chemical feed and safety features. If you maintain your equipment, can verify mounting and shaft dimensions, and have at least a 5.5 HP engine to drive it, this pump is a practical swap to restore original cleaning performance. Contact the seller with model, serial, and engine details if you need fitment help before buying.