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  About the pump

The pump is the heart of your pressure washer’s system. Pumps create flow not pressure; a pump increases a fluids pressure when it forces a fluid through a restriction. When the result exceeds 150 psi it is termed high pressure.

Pressure washer pumps are commonly direct drive or belt drive.


  • Direct drive pressure washer pumps have a hollow shaft which fits over the engine or motor drive shaft. The flange of the pump is mounted to the face of the engine or shaft end of the motor. Since the pump is mated directly to the engine shaft, the pump will run at the same RPM as the engine.
    • The drawback of your pump turning at the same RPM as the engine or motor is that your bearings and other parts will experience more wear and tear, therefore reducing the life of the pump.
    • The advantage of a direct drive pump is less moving parts and compact simple design making it a less expensive option.
  • Belt drive pressure washer pumps have a pulley mounted to its solid shaft and is driven by one or more belts attached to a pulley on the engine or motor. A pulley system allows the pump to spin at a lower RPM reducing wear and tear. Belts and pulleys also absorb vibration, reducing pump fatigue. The belt drive pump crankcase oil capacity is usually larger than a direct drive pump, when combined with the lower RPM’s of the belt drive pump it allows the pump to run much cooler than a direct drive pump. These factors make a belt drive pressure washer the choice of professionals.

The duty-factor of your pump or system could simply be the product life.

Or the duty-factor could be more specifically defined as the length of time a pump or system runs between servicing and the type of performance during this time frame.
As the demands on the pump or system increase, so can the duty-factor. Does the pump or system run 24 hours per day, 365 days per year? Is it operating at intermittent duty for 2-3 hours per day, 3-4 days a week? Is it operating only at light duty for 2-3 hours, once a month or for 2-3 months per year?

The duty-factor is affected by many variables including operating time, application, design, installation, system components and various operating and maintenance costs. When replacing your pressure washer’s pump get all the information available from the pump’s data plate. This information will ensure you get the exact replacement pump by model and brand. Also if you would like to upgrade to a higher quality or grade of pump this information is helpful to look up the correct type mounting, shaft, porting, frame etc. When there is no pump data plate or brand name available we can try to indentify it with the pressure washer’s model number.

Powerhouse Air and Fluid Power is pleased to offer one the most extensive lines of pressure washer pumps available. We offer most major brands including Cat Pumps, General Pumps, Annovi Reverberi, Udor, Comet, Giant, Hypro and Shurflo. We are here for the opportunity to serve your pressure washer pump requirements, please browse our site or call our toll free number 1-877-778-3144 and ask for our product specialist to help you with your pump requirements.