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Step by step guide

Evolution: replace capacitor

Servicing our pressure washers are quite straight forward and could be done by most people by following the step-by-step instructions in this manual. Please go trough the whole manual before starting work on your pressure washer to make sure you understand the procedure and that you have the necessary tools to complete the task.

Always unplug the pressure washer from both the mains power and the water outlet before starting the service. Even though power and water is disconnected there may be pressurized water in the hose. Discharge this pressure by pulling the trigger on the gun. Make sure your work area is clean and appropriate for the work you are about to do. There will usually be a small amount of water inside the pump and hose. If you are doing a 10-year service, then be prepared to collect the used oil from the oil chamber. Please dispose of the oil in accordance with local law and regulations. ISO 46 hydraulic oil can be substituted with similar non detergent oil of the same viscosity.

00. Parts and tools

An overview of what is needed to do this service.

01. Remove the hose reel

Release the short pressure hose from the pump outlet.

Unscrew the three T25 screws from the back cabinet. Take off the cover and the hose reel

02. Remove screws from the rear cabinet

Remove the power cable from the cable reel so you can access the two screws behind the reel.

Unscrew the eleven T25 screws from the backside of the pressure washer.


03. Remove screws from the rear cabinet

Only for P90 models.

Unscrew the four 6mm Allen screws holding the motor to the rear cabinet.

04. Remove the rear cabinet

Put the pressure washer face down. Lift off the rear cabinet.

Release the strain reliever and the power cord.


05. Remove the screws from the motor cowling

Unscrew the four T25 screws securing the motor cowling.



06. Remove the motor cowling

Remove the rear half motor cowling.

Now you can access the capacitor and its cabling.

07. Unplug the defective capacitor

Release both spade connectors by pressing down the locking tabs then gently pulling the cable from the capacitor.

08. Connect the new capacitor

Get the new capacitor and connect the two spade connectors. The capacitor is bipolar, so it does not matter where the black and white cables go.

Give the cables a light tug to check that they are properly seated.

09. Put the capacitor back into the motor cowling

Put the capacitor back into the lower half of the motor cowling, connectors facing towards the switch box.

Put the upper half of the motor cowling back over the motor. Make sure that the cabling from the capacitor goes trough the slots in the motor cowling.

10. Secure the motor cowling

Secure the upper and lower motor cowling using four T25 screws.

11. Refit the rear cabinet

Fit the strain reliever and make sure the power cord is correctly situated.

Place the rear cabinet onto the front cover. Adjust so both parts align correctly. If you are having trouble to get a good fit, check that the power cables and motor cowling are aligned correctly.

12. Secure the motor/pump

Only for P90 models.

Fix the motor to the back cabinet with the four remaining 6mm Allen screws.

If the holes does not align, remove the rear cabinet and adjust the motor/pump.


13. Fasten the rear cabinet

Secure the front cover to the rear cabinet with eleven T25 screws.


14. Fit the hose reel assembly

Fit the hose reel assembly to the rear cabinet. Push the interconnect pressure hose into the depression. Fit the cover and secure it with three T25 screws.

Connect the hose to the outlet.

29. First start after service

Congratulations with finishing the service of your AVA product.

It is now time to do the first start after service.

  1. Start by connecting the pressure gun to the hose.
  2. Connect water. Make sure no water is leaking from the inside or anywhere else on the pressure washer.
  3. Pull the trigger and let the water flow until there is no more air coming out.
  4. Connect the power cord.
  5. Turn on the pressure washer.
  6. Pull the trigger and let water run for a minute before connecting a nozzle.
  7. Connect the nozzle.
  8. Use the pressure washer and make sure it is operating as normal.

30. Troubleshooting

Water is leaking from the inside

  • Disconnect the power and open the pressure washer to locate the leak.
  • Take necessary action to remedy any leaks.

Motor runs and won't stop when you release the trigger

  • This is most likely due to an improper seating of the switch box on the start/stop valve.
  • Open the machine and check that the switch box is correctly seated.

The pressure washer won't turn on

  • Check that the power cable is connected.•Check that the circuit breaker has not been tripped.
  • Check that the fuse in the power plug is intact (UK models only).
  • Open the machine and check that all the internal cabling is connected.

Poor performance/pressure

  • Improper assembly or dirt/debris in the pump.
  • Check that the pump and especially the main valve for foreign objects/debris.
  • Make sure that the spring in the main valve is correctly seated and working as intended.

Motor is making a humming noise and is not able to start

  • Check that the capacitor is connected to the motor.
  • It should be connected with one white and one black cable.