SIMPSON OEM Technologies Axial Cam Pump Kit 90029
3,300 PSI · 2.4 GPM · 3/4 in shaft.
The SIMPSON 90029 is a replacement OEM Technologies axial cam pump kit rated 3,300 PSI at 2.4 GPM, for engines with a 3/4 in horizontal shaft. It has a garden-hose inlet and a threaded M22 outlet, and fits engines such as the Honda GC190 and GX200.
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Specifications at a glance
| Brand | SIMPSON |
|---|---|
| Part number | 90029 |
| Pump | OEM Technologies axial cam |
| Engine shaft orientation | horizontal |
| Shaft diameter | 3/4 in |
| Max pressure | 3,300 PSI |
| Max flow | 2.4 GPM |
| Inlet | Garden hose |
| High-pressure outlet | threaded M22 |
| Manifold | brass |
| Unloader | integrated with Easy Start |
| Warranty | 2-year |
From SIMPSON's pump catalog. Anything SIMPSON doesn't state is marked as not stated.
What to know about the 90029
Shaft and orientation
The pump slides onto the engine crankshaft, so the shaft must be 3/4 in and horizontal. SIMPSON names the Honda GC190 and GX200 as 3/4 in shaft engines.
Match the rating
SIMPSON's guidance is to match engine orientation, PSI, GPM, shaft diameter and the inlet and outlet connections of your current pump. This kit is rated 3,300 PSI at 2.4 GPM; after any pump change, size your nozzles to the new rating with the nozzle size calculator.
Outlet and hose
The outlet is threaded M22, so it takes the M22 hoses most homeowner gas washers use, such as MorFlex.
Two ratings published
SIMPSON's catalog lists 3,300 PSI at 2.4 GPM; its current product page lists 3,400 PSI at 2.5 GPM. Both describe the same 3/4 in horizontal kit.
Key features (from SIMPSON)
- OEM Technologies axial cam pump
- 3,300 PSI at 2.4 GPM
- 3/4 in shaft, horizontal engines
- Brass manifold
- Unloader: integrated with Easy Start
- Garden-hose inlet, threaded M22 outlet
- 2-year warranty
Is it right for you?
| Good choice if | your engine has a 3/4 in horizontal shaft and your washer was rated close to 3,300 PSI at 2.4 GPM |
|---|---|
| Look elsewhere if | your engine shaft is not 3/4 in |
| Look elsewhere if | your engine is vertical-shaft |
| Look elsewhere if | your hose uses quick-connect fittings and you don't want adapters |
Questions about the 90029
Will the SIMPSON 90029 fit my pressure washer?
It fits engines with a 3/4 in horizontal shaft and the standard SAE bolt pattern, on washers rated around 3,300 PSI at 2.4 GPM. Check your engine shaft and your current pump's inlet and outlet first.
Do I need new nozzles after changing the pump?
Only if the new pump's rating differs from the old one. Work out the right size for 3,300 PSI at 2.4 GPM with the nozzle size calculator.
Does the 90029 need oil?
SIMPSON describes the 90029 crankcase as maintenance-free, with no oil changes.
What to check before buying
Other 3/4 in shaft pump kits
- SIMPSON 90036 3,200 PSI · 2.8 GPM · AAA Triplex
- SIMPSON 90052 3,500 PSI · 2.5 GPM · AAA AX300 Axial Cam
- SIMPSON 90037 3,700 PSI · 2.5 GPM · AAA Triplex
Source and editorial status
Manufacturer reference: SIMPSON pump catalog ↗ and SIMPSON product page ↗. Specifications checked 3 November 2026. We have not tested this product.