How to Adjust a Pressure Washer Unloader

A pressure washer is a versatile tool that is used in a variety of applications, from cleaning your siding to washing your deck. High quality pressure washers utilize pressure unloaders. A pressure washer unloader controls the discharge pressure of your pressure washer. The remaining water is then recycled back into the inlet of your pressure washer. Unloaders are extremely useful since different applications require different output pressures. Running at full pressure can cause damage in some circumstances.

A pressure washer unloader prevents damage from too much water pressure.
  1. Turn your unloader adjustment handle to the minimum setting by turning it all the way counterclockwise.

  2. Check all fittings and hoses to ensure they are connected properly and there are no cracks or tears in them. Verify that your water supply is connected properly and turned on.

  3. Start your pressure washer. Check the gauge to ensure pressure does not spike. The pressure washer should be in bypass mode and the pressure should remain low. Turn up the engine to medium RPM level.

  4. Press the trigger on your pressure washer wand to flow water out of the nozzle.

  5. Grasp the handle of the unloader and slowly turn it clockwise. Keep turning until the pressure on the pressure gauge increases by 500 PSI. Release the trigger to ensure the pressure washer goes into bypass mode once again. The pressure spike should be less than 200 PSI over the working pressure.

  6. Repeat Steps 4 and 5 until you reach 1500 PSI working pressure. Increase the engine RPM to maximum level.