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90037 complete pressure washer pump kit
90037 complete pressure washer pump kit Pump Kit AAA Triplex Plunger Pump 3700 PSI 2.5 GPM Max PSI 90037 SImpson AAA pressure washer pump crankcase 90037 Triplex plunger pump engine shaft and standard bolt mounting bracket 90037 OEM Technology AAA power washer pump Pump Kit AAA Triplex Plunger Pump 3700 PSI 2.5 GPM Max PSI

90037 Pump Kit AAA Triplex Plunger Pump 3700 PSI 2.5 GPM Max PSI

In stock
Part Number
Part Number: 90037
Shipping Weight: 14 Lbs
The 90037 AAA™ Triplex Plunger Pump Kit is a highly efficient pump that minimizes engine load while delivering top performance.

This AAA 90037 Triplex Plunger Pump has a patented Powerboost technology that provides higher pressure at the spray nozzle.

The 90037 contains dual oversized ball bearings for better wear, friction resistance, and longer-lasting performance in challenging cleaning environments.


-3700 PSI @ 2.5 GPM Max burst Pressure
-PowerBoost Technology
-Fully adjustable unloader system with ergonomic control
-Sight glass and advanced oil seal technology does away with the need for a dipstick
-Thermal relief protection to prevent pump overheating
-Dual oversized radial ball bearings are installed for better wear, and friction resistance, and precision ceramic coated pistons for extended seal life
-Crankcase is manufactured from fully anodized die-cast aluminum for corrosion protection and is sealed to prevent contamination and lube failure
-Gas engine flange and hollow shaft that fits most horizontal shaft engines


PSI: 3700 Max burst Pressure
GPM: 2.5
Kit Includes: Siphon tube with filter, mounting bolts, and shaft key
Inlet Port: 3/4" GH
Discharge Port: Threaded male fitting
Inlet Pressure Range: 10-60 PSI
Thermal Relief Port: 1/4" NPT
Shaft Diameter: 3/4"
Flange Bolt Pattern: SAE J-609A
Key Way: 3/16"
Pump Oil Capacity: 8.0 fl oz.
PowerBoost: Yes
Head: Brass

Service Note:

The "Burst Pressure" of a pressure washer pump is the highest pressure the pump produces when in a static position and when the trigger is first squeezed, giving the initial burst of pressure and does not reflect the actual operating pressure.

The accurate operating PSI of any pump would be determined by the engine’s horsepower and the size of the nozzle being used at the end of the wand, restricting water flow and causing back pressure.

It is possible for a single pump to be rated at various GPM and maximum PSI levels by adjusting factors such as engine RPMs, nozzle size, or engine horsepower.

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