SIMPSON Manifold Replacement Kit for OEM Technologies 510026 axial-cam pump, aluminum manifold with integrated unloader & TRV

The SIMPSON 7113810 Manifold Replacement Kit is a complete aluminum manifold assembly that restores function to OEM Technologies 510026 axial-cam pressure washer pumps by replacing inlet, outlet, valves, unloader, and thermal relief components.

If your pressure washer pump is leaking, producing low pressure, or the soap injection and unloader aren’t working, replacing the manifold often fixes the problem faster and cheaper than replacing the entire pump. This replacement kit is engineered as an original-equipment match for the 510026 axial cam pump and ships with the fittings and hardware needed for a straightforward swap. The kit’s cast aluminum manifold includes a 3/4" garden-hose low-pressure inlet, an M22 high-pressure outlet, an integrated unloader, thermal relief valve (TRV), installed valves, and a soap hose screen for reliable performance.

What parts are included and why does that matter?

The 7113810 kit arrives ready to install with the key components preassembled so you don’t have to source extra parts. Having the unloader, valves, and TRV installed saves time and reduces installation errors.

• Aluminum manifold body with factory-drilled ports for accurate fit
• Integrated unloader assembly for pressure regulation and protection
• Thermal relief valve to release excess heat and pressure
• Soap hose screen and installed valves to restore injection and flow control
• Mounting hardware included for direct replacement

How do I know this fits my pump?

Compatibility is specific: this manifold kit is designed as an OEM replacement for the 510026 axial cam pump model. Confirm your pump model number before ordering—installing the correct manifold ensures port locations and fittings line up with your pump housing and hoses.

• Intended for OEM Technologies model 510026 axial cam pumps
• Matches factory 3/4" garden-hose low-pressure inlet and M22 high-pressure outlet
• Mounting bolt pattern and port spacing mirror the original part
• Not universal—verify model stamped on your pump housing

What tools and time are required for installation?

Installation is typically straightforward for someone comfortable with basic mechanical work and pressure washer plumbing. Expect to spend 30–90 minutes depending on accessibility, and keep common hand tools and thread sealant on hand.

• Screwdrivers, adjustable wrench, and metric sockets recommended
• Thread sealant or Teflon tape for inlet/outlet fittings
• Drain water and disconnect hoses before starting
• Inspect seals and O-rings during assembly and replace if worn

How does this kit protect the pump after installation?

The kit includes protective features that help prevent damage from heat and backpressure. The integrated unloader and TRV reduce stress on internal pump components during stall or high-temperature conditions.

• Integrated unloader diverts flow to bypass when the trigger gun is closed
• Thermal relief valve vents hot fluid to prevent overheating
• Factory-installed valves ensure consistent sealing and performance
• Aluminum construction resists corrosion while remaining lightweight

Who is this for: The SIMPSON 7113810 Manifold Replacement Kit is aimed at DIYers, service technicians, and small-business owners who maintain OEM Technologies 510026 axial cam pressure washer pumps. If you want an OEM-equivalent repair that restores soap injection, unloader functionality, and safe thermal protection without replacing the entire pump, this kit supplies the matched components and hardware for a reliable, time-saving repair.