The Simpson 90029 is an OEM Technologies horizontal axial cam pump kit that replaces a worn or failed pump on gas pressure washers, restoring up to 3,400 PSI at 2.5 GPM. It is the fix contractors and rental fleets reach for when the engine still runs strong but the pump has lost pressure or started leaking.
Where it is used
The maintenance-free crankcase and stainless steel internals make this a durable replacement for:
- Rebuilding a gas pressure washer with a horizontal engine and a 3/4-inch diameter shaft
- Replacing a leaking or low-pressure pump on Honda GC190 and GX200 powered machines
- Getting rental or fleet pressure washers back in service quickly
- Upgrading to stainless steel pistons for longer seal life
Specifications
- Output: up to 3,400 PSI at 2.5 GPM
- Fits: gas pressure washers with a horizontal engine and 3/4-inch shaft (such as Honda GC190 and GX200)
- Stainless steel pistons and stainless steel integrated unloader with easy-start system
- Maintenance-free crankcase, no oil changes required
- Thermal Relief Valve protects the pump in bypass mode
- Connections: garden hose inlet and threaded M22 high pressure outlet
- Includes siphon tube with filter, mounting bolts, shaft key, and instruction booklet
Frequently asked questions
Which engines does the 90029 fit?
It is designed for gas pressure washers with a horizontal engine and a 3/4-inch diameter shaft, such as the Honda GC190 and GX200. Check your engine shaft size and mounting pattern before ordering.
Do I need to change the oil in this pump?
No. The 90029 has a maintenance-free crankcase, so there is no oil to change over the life of the pump.
What is included in the kit?
Each kit includes the pump, a siphon tube with filter, mounting bolts, a shaft key, and an instruction booklet so you can get the machine running again.
What does the easy-start unloader do?
The stainless steel integrated unloader with easy-start system reduces the effort needed to pull-start the engine by relieving pressure at startup, and it routes water back through the pump when the trigger is released.
Discount Cleaning Products is an authorized dealer of Simpson pressure washer equipment and parts, backed by US-based customer service to help you match the correct pump to your machine.
