MSV3100 PRESSURE WASHER 3100 PSI

Replacing the MSV3100 Pressure Washer Pump with the 510003 Pump

Introduction:

This document provides instructions for replacing the original equipment manufacturer (OEM) pressure washer pump on an MSV3100 with the 510003 pump.
The original pump with extended inlet and outlet tubes is no longer available, and the 510003 (3,000 PSI pump with a round base) is the recommended replacement.
This procedure requires the removal of the front black scoop cover of the MSV3100, where the inlet and outlet tubes are located.

 Please note that the new 510003 replacement will not have the longer extension tubes that were present on the original pump.

Tools Required:

• Socket wrench set
• Adjustable wrench (if needed)
• Protective gloves
• Safety glasses
• Spark plug wrench
• Screwdriver set (Phillips head and flathead)

Safety Precautions:

• Disconnect the spark plug lead and remove the spark plug from the engine before starting any work. This will allow the engine crankshaft to turn easily during installation of your new pump.
• Release any residual pressure in the system by triggering the spray gun.
• Wear safety glasses and gloves to protect your eyes and hands.
• Ensure the pressure washer is on a stable, flat surface.
• If you are uncomfortable with this procedure, consult a qualified service technician.

Steps:

1. Prepare the Pressure Washer:

• Disconnect the water supply hose.

• Trigger the spray gun to release any remaining pressure that may exist.

• Disconnect the spark plug lead.

• Remove the spark plug from the engine using a spark plug wrench.

• Remove the air filter from the engine to prevent any gas or oil getting into the air filter during installation of the new pump.

• Lay the pressure washer on its back or position it so you can easily access the front black scoop cover and pump.
  
  

2.                  Remove the Front Black Scoop Cover from the MSV Series pressure washer.

• Locate the screws securing the front black scoop cover, where the inlet and outlet tubes are located.

• Use the appropriate screwdriver to remove all the screws.

• Carefully remove the front black scoop cover. It may be necessary to gently pry it off.
  
  

3.                  Remove the Old Pump:

• Locate the bolts or screws securing the old pump to the engine.

• Use a socket wrench or adjustable wrench to loosen and remove these bolts or screws.

• Carefully remove the old pump.

• After pump removal, clean the crankshaft of the engine with steel wool, wire brush or a light sandpaper and remove any debris or residue from the crankshaft leftover from cleaning.

• Verify the 3/16 keyway is in the crankshaft of the engine. Ensure the keyway is clean and undamaged before proceeding to installation of the new pump.

• Note the direction of the hose connections to the old pump for proper reconnection to the new pump.
  
  

4.                  Install the 510003 Pump:

• Verify the 3/16 keyway is in the shaft. Ensure the keyway is present and undamaged before proceeding to installation of the new pump.

• Verify the crankshaft is clean of any debris and apply a light coat of grease to the crankshaft.

• Align the 3/16 key to the 3/16 keyway inside the new 510003 pump shaft.

• Position the 510003 pump onto the engine mounting surface.

• Align the bolt holes on the new pump with the holes on the engine.

• Secure the new pump using the bolts or screws removed from the old pump.

• Tighten the bolts or screws securely.

• Reinstall the spark plug and reconnect the spark plug lead.
  
  

5.                  Reconnect the Hoses:

• Reconnect the hoses to the 510003 pump, ensuring they are connected to the correct ports.

• Note: The new 510003 replacement will not have the longer extension tubes that were present on the original pump.
  Adjust hose connections accordingly.

• Ensure all connections are tight to prevent leaks.
  

• Ensure hoses are not kinked.
  
  

6.                  Test the Pressure Washer:

• Reconnect the water supply hose and turn on the water supply and allow water to run through the new pressure washer pump without the high-pressure hose and trigger gun connected for 30 seconds.

• With the high-pressure hose still disconnected from the new pressure washer pump start the engine and allow the unit to run for 3 to 5 minutes for break in of the new pump.

• After the break in time has been completed turn off the engine then turn off the cold-water supply.

• Connect the high-pressure hose and trigger gun back to the pressure washer's new pump.

• Turn on the water supply to the pressure washer pump

• Start the pressure washer and test its operation.

• Check for any leaks and ensure the pump is functioning correctly.
  
  

Troubleshooting:

• Leaks: Check all hose connections and tighten as necessary. Pay special attention to the connections where the extension tubes were previously located.
• Pump does not build pressure: Ensure the water supply is adequate. Check for any obstructions in the hoses or pump, make sure the 3/16 key has not become dislodged from the crankshaft during pump installation.
• Pump makes unusual noises: Stop the pressure washer immediately and check for any loose parts or damage.
• Engine will not start: Check the spark plug connection.
  
  

Conclusion:

You have now successfully replaced the MSV3100 pressure washer pump with the 510003 pump.
Remember that the new pump does not have the longer extension tubes. If you experience any further issues or are unsure about any steps, consult a qualified service technician.