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Step by step guide

V6 10 year service

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 water filter

Unscrew the water filter from the pump.

02. Remove screws

Unscrew the four T25 screws from the back cabinet.

03. Remove decorative cover

Using a flat screwdriver carefully push in the two hooks that locks the top cover in place. With both hooks released, the cover should come off.

04. Remove water outlet

Using a flat screwdriver, pry lose the U-pin that secures the outlet connector to the pump head. Remove the outlet connector.

05. Remove the pump covers

Now you should be able to remove both the front and the back cover to access the pump. Remove the on/off knob.

06. Remove screw

Unscrew the single T25 screw that secures the switch box.

07. Remove switch box

The switch box is press fitted onto the start/stop valve on the pump. Remove the switch box by pulling it in the direction indicated by the arrow.

08. Remove screws

Unscrew the four 6 mm Allen screws securing the pump.

09. Remove the pump

Rotate the whole pump assembly 15-20° counterclockwise to release it from the motor oil chamber.

Remove the whole pump assembly.

10. Drain the oil

Drain the oil chamber by tilting the machine 90 degrees.

If the oil has a lot of metal particles in it, we suggest that you also remove the wobble plate assembly and visually inspect the two thrust bearings for damage. If there is no visible damage, clean the parts and the oil chamber, and reassemble.

11. Extract the backing rings

If the service kit does not come preassembled, you need to split the old pump. Remove the four Allen keys keeping the pump together and extract the six brass (pink) and plastic (blue) backing rings.

12. Prepare the service kit

Lubricate O-rings as indicated.

13. Assemble the service kit

Assemble the service kit as illustrated. The start/stop valve (the white plastic nut with a metal protrusion on the pump head) should be aligned with the protrusion with a hole on the piston kit. Plastic backing rings are blue and brass backing rings are pink.

Tighten up the four Allen screws.

14. Refill oil

Fill oil in to the oil chamber. The oil should reach the top of the thrust bearing as indicated by the red line below.

15. Fit the pump assembly to the motor

Before fitting lubricate the O-ring on the oil chamber with some of the hydraulic oil.

As soon as everything is aligned correctly press the pump assembly down own to the motor. A fair amount of force is needed as you are compressing the piston springs towards the wobble plate. When the two mating surfaces are in contact, twist the pump assembly 15-20° clockwise so that the two locks engage.

16. Secure the pump assembly to the motor

Using the 4 short Allen bolts, secure the pump to the motor.

17. Attach the switch box

Attach the switch box to the pump. You need to use a decent amount of force to get the box firmly seated on the start/stop valve. It should pop into place.

18. Secure the switch box

Secure the switch box using a T25 screw.

19. Attach the switch knob

Make sure that the spring on the switch box extension is correctly attached. Fit the on/off knob to the switch box.

20. Fit the front cover

Fit the front cover onto the pump.

Fit the power cord strain reliever into the slot.

21. Fit the back cover

Put the capacitor back into the front cover with connectors and cables pointing inwards.

Fit the back cover onto the pump.

22. Fit the pump outlet connector

Fit the outlet connector onto the pump head. Secure the outlet with a U-pin. Use a small hammer or similar tool to tap the U-pin into place.

23. Fit the top decorative cover

Put the top decorative cover back on. It should pop in to place.

Check that the on off button is able to operate freely.

24. Secure the pump covers

Secure the front and back cover using four T25 screws.

25. Attach filter

Check that the water filter is clean then reattach the filter.

26. 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.
  3. Make sure no water is leaking from the inside or anywhere else on the pressure washer.
  4. Pull the trigger and let the water flow until there is no more air coming out.
  5. Connect the power cord.
  6. Turn on the pressure washer.
  7. Pull the trigger and let water run for a minute before connecting a nozzle.
  8. Connect the nozzle. Use the pressure washer and make sure it is operating as normal.

27. 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.