EZJOB 3400 PSI 2.5 GPM Pressure Washer Pump — Horizontal 3/4" Shaft, Aluminum Body, Pre-Filled Oil

EZJOB's 3400PSI 2.5 GPM horizontal pressure washer pump is a direct-replacement pump with a 3/4" shaft designed to restore strong cleaning power to compatible gas pressure washers.

This aluminum-bodied pump delivers up to 3400 PSI at 2.5 GPM for demanding outdoor cleaning tasks and is made as a drop-in replacement for many popular horizontal-shaft gas engines (180–225cc). It comes pre-filled with oil, includes thermal relief protection for longevity, and uses a standard 3/4" NH garden hose inlet plus an M22 threaded high-pressure outlet to fit a wide range of machines. Before ordering, confirm your shaft size, mounting pattern and original pump specifications to ensure fitment.

How will this pump improve my pressure washer's performance?

Replacing a worn or failing pump with this unit restores peak pressure and flow to near-original levels, making heavy-duty cleaning possible again without buying a whole new washer. It achieves up to 3400 PSI and 2.5 GPM, suited for tough grime on concrete, decks, fences, and vehicles.

• Maximum rating: 3400 PSI / 2.5 GPM / 3400 RPM.
• Thermal relief reduces overheating risk during repeated use.
• Pre-filled oil simplifies initial installation and first use.
• Durable aluminum construction resists corrosion and wear.

Which engines and machines is this pump compatible with?

This horizontal axial pump fits gas engines with a 3/4" keyway shaft and common mounting patterns used on many consumer and prosumer washers. It’s widely compatible but always verify your model details beforehand.

• Fits 3/4" shaft horizontal axial gasoline engines in 180–225cc (6.5–7 hp) range.
• Works with brands like Troy-Bilt, Ryobi, Generac, Briggs & Stratton, Craftsman, Husky, Honda, Simpson, Karcher and others.
• Specific compatible models listed: SIMPSON MSH3125/MS60753/etc., HONDA GC190/GC160/GX160, HOMELITE part numbers, KARCHER G3050OH/K2400HH and more.
• Standard 3/4" NH inlet and M22 high-pressure outlet for common hose connections.

How difficult is installation and what should I check before buying?

Installation is straightforward for mechanically inclined users but requires checking a few critical dimensions and specs. Confirm the shaft diameter/keyway, mounting bolt pattern, and engine RPM compatibility to avoid fitment problems.

• Verify the shaft is 3/4" keyway and aligns with your engine coupling.
• Compare mounting pattern and bolt hole spacing with your original pump.
• Ensure your engine operates near the pump’s rated 3400 RPM for correct pressure output.
• Drain and refill fluids as needed and follow torque specs when mounting.

What maintenance and care extend the pump's life?

Routine checks and proper use will prolong the pump’s service life: maintain oil level, avoid freezing temperatures, and relieve pressure after each use. Thermal relief protects the unit during heavy-duty cycles, but regular inspection is advised.

• Check oil level periodically despite pre-fill; change according to use hours.
• Use thermal relief properly and allow cooling between long runs.
• Flush detergent and water lines after chemical use to prevent corrosion.
• Store indoors or winterize to prevent freeze damage.

Who this is for: This EZJOB replacement pump is intended for homeowners, landscapers and fleet technicians who want to revive an existing gas pressure washer rather than replace the entire unit. It’s best suited to users with compatible 3/4" horizontal-shaft engines (roughly 180–225cc) who need higher cleaning power for driveways, patios, siding, vehicles, and other exterior surfaces. If you already know your shaft size and mounting pattern, this pump offers a cost-effective upgrade to recover strong cleaning performance.