SIMPSON 3400 PSI 2.5 GPM Pressure Washer Pump Kit — Horizontal 3/4" Shaft, Anodized Aluminum

The OEM Technologies 90029 axial cam replacement pump for SIMPSON restores up to 3400 PSI at 2.5 GPM, fitting horizontal-shaft gas pressure washers to revive cleaning performance.

If a tired or leaking pump has left your pressure washer underpowered, this OEM Technologies axial cam pump kit is a direct swap solution for many horizontal-engine machines with a 3/4" shaft. Built from anodized die-cast aluminum with stainless-steel pistons and an integrated unloader, the 90029 is engineered to reduce engine load while delivering strong spray pressure for routine exterior cleaning. The kit includes the hardware and fittings needed to simplify installation and replaces the pump without the expense of a whole new unit.

Which engines and shaft types will this pump fit?

This pump is designed for horizontal-engine pressure washers that use a 3/4" diameter crankshaft, including common small gasoline engines such as Honda GX190 and GX200. Confirm your current pump’s inlet/outlet orientation and shaft size before ordering to ensure a proper match. The SAE bolt pattern and standard connections help compatibility with many popular models.

• Fits horizontal engines with 3/4" shafts (check your engine spec)
• SAE-standard bolt pattern for straightforward mounting
• Garden-hose inlet and M22 threaded high-pressure outlet
• Works with many Simpson hoses and accessory fittings

How do the materials and design affect durability and maintenance?

Key components are built to resist wear and reduce maintenance intervals: the pump housing is fully anodized die-cast aluminum for corrosion resistance, while stainless-steel pistons extend seal life. The crankcase is maintenance-free and requires no oil changes, lowering upkeep time for homeowners and professionals. Thermal relief protection prevents heat damage during bypass operation.

• Anodized die-cast aluminum body for corrosion protection
• Stainless-steel pistons for improved seal longevity
• Maintenance-free crankcase — never change pump oil
• Integrated thermal relief valve to prevent overheating

What’s included and how simple is installation?

The 90029 pump kit ships with the parts you need to replace a worn unit: mounting bolts, a shaft key, a siphon tube with filter, and straightforward instructions. Installation is typically a matter of unbolting the old pump, aligning the SAE bolt pattern, fitting the 3/4" shaft, and connecting the garden-hose inlet and M22 outlet. If you match shaft size and orientation, most mechanically inclined users can complete the swap with common hand tools.

• Includes siphon tube with filter, mounting bolts, and shaft key
• Instructions included for a step-by-step swap
• Standard inlet/outlet fittings simplify hose connections
• Easy-start integrated unloader reduces crank effort

What cleaning tasks is this pump best suited for?

With up to 3400 PSI at 2.5 GPM, this pump matches a wide range of residential and light-commercial jobs such as decks, siding, driveways, fences, and vehicle washing. The balanced pressure and flow are ideal for removing dirt, mildew, and general grime without oversizing equipment. Pair with appropriate nozzles and detergent for optimal results on each surface type.

• Walls, fences, decks and sidewalks
• Cars, trucks, RVs and lawn equipment
• Light commercial cleaning tasks around properties
• Works with Simpson MorFlex and Santoprene hoses

Who is this for: Homeowners, DIYers, and professional cleaners who already own a gas-powered pressure washer with a horizontal engine and a 3/4" shaft and want a reliable, cost-effective pump replacement. Choose the OEM Technologies 90029 kit when you need a corrosion-resistant, maintenance-light pump that restores performance without replacing the entire machine. Always verify shaft size, engine orientation, and inlet/outlet types to ensure compatibility before purchasing.