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Simpson 90034 Pressure Washer Pump – 4200 PSI @ 4.0 GPM


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Simpson 90034 Pressure Washer Pump – 4200 PSI @ 4.0 GPM

Engineered for the tough jobs, the Simpson 90034 4200 PSI 4.0 GPM Pressure Washer Pump can do the job with effective results and minimal engine use. This AAA Triplex pump comes with a 5 year limited warranty & dual oversized ball bearings for better wear, friction resistance & longer lasting performance

This pump belongs to the EW Series

Pump Specs:

  • PSI: 4200
  • GPM: 4.0
  • Shaft Diameter: 1″
  • Inlet Pressure Range: 10-60 PSI
  • Inlet: 3/4″ Garden Hose
  • Outlet: 3/8″ Quick Connect Female
  • Thermal Relief Port: 1/2″ FNPT
  • Pump Oil Capacity: 11.0 fl oz.

Pump Features:

  • 4200 PSI @ 4.0 GPM
  • 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, 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
  • Quick Connect outlet for easy connection to the pressure hose
  • Pump includes a chemical injector kit, mounting bolts, and shaft key
  • Forged brass Head

Always verify part numbers in your owner’s manual

Model: C45

Additional information


Max. PSI: 3801-4200


Max. GPM: 3.5-4.0

Pump Shaft Size

1" Hollow Shaft

Pump Type

Direct Drive




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Prop 65 Warning!

This product can expose you to chemicals which are known to the State of California to cause cancer.

Service Code:

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