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How To Remove Pressure Washer Pump from Motor

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In the world of DIY maintenance, knowing how to remove a pressure washer pump from a motor is an essential skill. Whether you’re dealing with a malfunctioning pump or simply wanting to upgrade your pressure washer, this guide will walk you through the process step by step.


To remove a pressure washer pump from a motor, first disconnect all hoses and the spark plug wire. Loosen the mounting bolts that secure the pump to the engine but don’t remove them yet. Support the bottom of the pump while removing the bolts, then pull the pump off the engine crankshaft. If the pump is seized to the shaft, use some penetrating oil and gently pry the pump loose or use a bearing puller.

Why Remove a Pressure Washer Pump?

Pressure washer pumps can fail for a number of reasons. Among the most common are lack of maintenance, overheating, excessive vibration, cavitation, worn-out parts, and more. If your pump has ceased functioning efficiently, it may be time to remove and replace it.

Essential Tools for the Task

Before you start, gather the following tools:

  • Adjustable wrench
  • Socket set
  • Allen wrenches or Allen head bit
  • Rubber mallet or pry bars
  • Penetrating oil
  • Anti-seize or oil

Safety Precautions

Safety is paramount when dealing with any mechanical task. Here are some precautions to take before you start:

  • Read the owner’s manual.
  • Disconnect the power source.
  • Gather necessary tools and materials.
  • Wear protective gear.
  • Clear the area.
  • Engage the trigger lock.
  • Do not wear open-toed shoes.
  • Keep children and pets away.

Step-by-Step Process

Here’s a step-by-step guide on how to remove a pressure washer pump from a motor:

  1. Disconnect all hoses: Unplug all the hoses from the pressure washer to prevent any leaks or spills during the removal process.
  2. Disconnect the spark plug wire: Pull the wire from the spark plug to disconnect it.
  3. Loosen the mounting bolts: The pump is typically attached to the bottom of the pressure washer by three Allen-head bolts. Loosen, but don’t remove, the Allen-head mounting bolts that secure the pump to the engine.
  4. Support the pump: With the pressure washer upright, support the bottom of the pump while removing the Allen-head mounting bolts from the pump.
  5. Remove the pump: Pull the pump off the engine crankshaft or allow the pump to drop down and off the crankshaft to remove the pump from the engine. If the pump is seized to the shaft, try using some penetrating oil and gently pry the pump loose or use a bearing puller to pull it off.

Reinstalling the Pump

Once you’ve removed the old pump, you can start the process of installing a new one. Here’s how:

  1. Prepare the new pump: Apply a light coating of anti-seize or oil on the engine shaft.
  2. Align the pump with the engine shaft: Position the new pump so that the keyway on the pump aligns with the key on the engine shaft.
  3. Attach the pump to the motor: Secure the pump to the motor using the appropriate mounting bolts. Tighten the bolts evenly to ensure proper alignment.
  4. Reconnect the hoses: Reconnect the chemical injection tube to the chemical injection inlet valve, the nozzle hose connection, and the inlet water hose connection on the pump.
  5. Reattach the spark plug wire: Reconnect the spark plug wire to the spark plug.
  6. Test the new pump: Start the pressure washer and test the new pump to ensure proper operation.

Regular Maintenance

To ensure the longevity of your pressure washer pump, regular maintenance is key:

  • Use the right cleaning fluids.
  • Purge the pump of contaminants.
  • Check and replace O-rings.
  • Clean the chemical/detergent intake.
  • Use pump lubricant/antifreeze.
  • Change pump oil.
  • Store properly.

By following these steps, you can safely and effectively remove and replace a pressure washer pump, ensuring your machine is always in top working order.

Frequently Asked Questions

What is a pressure washer pump?

A pressure washer pump is a crucial component of a pressure washer that creates the high pressure needed for the machine to function. It does this by pressurizing the water supplied to it and then expelling it at high speed through a spray wand.

What are the signs of a failing pressure washer pump?

Some common signs of a failing pressure washer pump include loss of pressure, water leaks, unusual noises, and the pump failing to produce a strong water stream. If you notice any of these, it might be time to remove and replace your pump.

How often should I maintain my pressure washer pump?

The frequency of maintenance depends on how often you use your pressure washer. If you use it regularly, it’s recommended to perform maintenance tasks such as changing the oil and checking the O-rings every 3 to 6 months. If you use it less frequently, annual maintenance should suffice.

Can I use any type of oil for the pump?

No, it’s recommended to use specific pressure washer pump oil. Using the wrong type of oil can cause damage to your pump. Always check your owner’s manual for the manufacturer’s recommendation.

Why is it necessary to disconnect the spark plug wire before removing the pump?

Disconnecting the spark plug wire is a safety precaution. It prevents the engine from accidentally starting while you’re working on it, which could lead to serious injury.

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