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Pressure Washer Water Pump Maintenance

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Pressure washer water pumps need relatively low maintenance. The two main concerns are keeping contaminants out of the pump and changing the pump oil on schedule. (Some pumps do not need oil changes.) Purge the water pump to remove impurities and debris and change the pump oil every 50 hours of use or once a year, whichever occurs first. Use only oil recommended by the manufacturer, as specified in the owner's manual. (Purchase pre-measured bottles of pump oil for water pumps without dipsticks.) Never use special oil additives or detergents, unless specified in the owner's manual.

Purge pump of contaminantsStep 1 -  Purging the pump of contaminants. Prepare the pressure washer for use. Turn on the supply water, then remove the wand from the spray gun. Start the engine, then squeeze and hold the spray-gun trigger until there is a constant, steady stream of water. Hold for 2 minutes, then engage the trigger safety latch and refasten the wand to the spray gun.




Drain oil from pumpStep 2 - Changing pump oil. Drain the oil and fuel from the engine. Remove the oil cap on the water pump with an Allen wrench. Tilt the pressure washer to drain the used oil into an approved container. Tilt the unit back in the opposite direction after the oil has drained.





Fill water pump with fresh oilStep 3 - Changing pump oil. Fill the water pump with fresh oil, following the directions in the owner's manual. Note: Premeasured bottles of water pump oil are available for some models. Reinstall the oil cap and tighten firmly, then wipe up any excess oil around the cap and set the pressure washer in the upright position. Clean up any spilled oil, and dispose of used oil and soiled rags in accordance with local environmental statutes.



See also: Preventative Pressure Washer Maintenance


1–10 of 11 Questions  
    1. You can leave oil in the pressure washer. If you want to leave fuel in the unit, please make sure you use a fuel stabilizer otherwise the fuel will go stale and clog your carburetor. Also when not in use we recommend the use of Pump Saver. This will keep the o-rings and seals lubricated, help prevent calcium and mineral build up, and it has an anti-freeze in it that will protect the pump against cold weather and freezing.

    1. No these pumps cannot pull water from a tank. You need at least 20psi going into the pump from a garden hose.

    1. An oil pump pushes the oil through the engine to lubricate the engine, a water pump pushes water through.

  1. Oil

    1 answers
    1. The engine can burn up to 1 ounce of oil per cylinder per hour. The engine will become hot. Please double check the oil level. If it is too high it can cause the smoking.

    1. For info on the pressure washer pump please contact Craftsman as the pump is a part of the pressure washer.

    1. 4.6 ounces of a 75W90.

    1. The pumps come with oil in them and are sealed.

    1. It sounds like the pump is building too much pressure. It could be the unloader is sticking and not bypassing. I would recommend the unit be taken to an authorized service center for diagnostic and repairs.

      You can locate the authorized Briggs & Stratton service and parts dealers nearest to you at this link:

  2. 1 answers
    1. Replacing the chemical injection valve should solve the problem, part number 190593gs

    1. You can take the unit to a local Briggs & Stratton service dealer. You can find one that works on the pressure washers here:

1–10 of 11 Questions  

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