SIMPSON AAA Replacement Pressure Washer Pump 3200 PSI 2.8 GPM — Horizontal 3/4" Shaft, Triplex Ceramic

The SIMPSON 90036 AAA Professional Triplex Pump is a direct-replacement pressure-washer pump that delivers up to 3200 PSI at 2.8 GPM for horizontal-shaft gas engines.

Built to restore performance without replacing your entire unit, this pump kit is engineered for gas pressure washers with a horizontal engine and a 3/4" shaft (for example, Honda GX200-style engines). The triplex ceramic plungers, stainless integrated unloader, and dual oversized ball bearings lower friction and engine load while providing durable cleaning power for sidewalks, siding, vehicles, and commercial tasks. The kit simplifies maintenance with a sight glass for oil level checks and an easy-start unloader design.

How does this pump improve cleaning power and efficiency?

The 90036 uses triplex ceramic plungers and PowerBoost Technology to deliver steady high-pressure flow while reducing engine strain. That boosts nozzle pressure and cleaning performance without overworking the engine.

• Maximum rating: 3200 PSI at 2.8 GPM for demanding cleaning jobs
• PowerBoost Technology increases nozzle pressure for better soil removal
• Dual oversized ball bearings reduce internal friction for consistent output
• Triplex design promotes smoother pressure pulses and longer pump life

Will this pump fit my pressure washer and how do I check compatibility?

This replacement is designed to fit many gas pressure washers that use an SAE standard bolt pattern, a horizontal engine orientation, and a 3/4" diameter engine shaft. Confirm the pump inlet/outlet orientation, engine shaft size, PSI/GPM rating, and threaded high-pressure connection before ordering.

• Mounting: SAE-standard bolt pattern for horizontal engines
• Shaft: 3/4" diameter horizontal engine shaft (confirm actual measurement)
• Connections: garden-hose inlet and M22 threaded high-pressure outlet
• Recommended hoses: compatible with Simpson MorFlex and Santoprene models listed

What maintenance features help extend pump service life?

The 90036 includes accessible design elements to make routine care easier and reduce downtime. A sight glass replaces the need for a dipstick, while advanced oil seals and an integrated unloader help prevent water intrusion and allow simple pressure relief for starts and stops.

• Sight glass shows oil level and clarity for quick inspections
• Advanced oil seal tech minimizes contamination and leaks
• Integrated stainless unloader with easy-start reduces start-up strain
• Durable bearings and ceramic plungers resist wear in tough conditions

How flexible is the pump for different cleaning tasks?

The pump provides adjustable output for varied surfaces: a hand-turn knob reduces pressure for delicate tasks while PowerBoost gives extra force when you need it. That makes the 90036 suitable for both heavy-duty cleaning and gentler applications where lower pressure preserves surfaces.

• Hand-turn pressure knob for on-the-fly down-tuning
• PowerBoost for higher nozzle pressure when required
• Standard M22 outlet supports common high-pressure hoses and fittings
• Supports a variety of residential and light commercial cleaning jobs

Who is this for: The SIMPSON 90036 pump kit is intended for owners of gas-powered pressure washers with horizontal engines who want to replace a worn pump instead of buying a new machine. It fits users who need up to 3200 PSI at 2.8 GPM for patios, driveways, equipment, and vehicle cleaning, and who value easy maintenance features like a sight glass, integrated unloader, and durable internal components for long service life.