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Step by step guide

Master: replace internal hose

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 from the hose reel

Remove the hose from the hose reel.

Push in the two hooks while pulling the reel handle to release the handle.

02. Remove the handle from the reel

Remove the handle from the reel.

Move the hose on the reel slightly downwards to expose one of the Torx screws.

03. Remove screws from the hose reel

Remove the 5 screws on the hose reel.

04. Disassemble the hose reel

Remove the right side of the hose reel frame.

Remove the hose guide.

05. Remove the U-pin from the swivel

Pull the hose reel to the right to access the hose reel swivel.

Remove the U-pin securing the hose to the swivel.

06. Remove the hose from the swivel

Pull the hose out of the swivel.

07. Remove the rest of the hose reel assembly

Remove the left reel holder and the hose reel.

08. Remove the water filter

Remove water filter by unscrewing it counterclockwise.

09. Remove screws from the back cabinet

Unscrew the six T25 screws from the back cabinet.

10. Remove the front cover

Push the front brace release button and pull the front cover off.

11. Remove screws from the motor/pump

Unscrew the four T25 screws securing the motor/pump.

12. Release cable strain relief

Release the Cable strain release form the back cabinet.

Carefully lift the motor/pump so that it is on an angle.

13. Release the internal hose

Use a flat screwdriver or a small knife to release the u-pin securing the internal hose to the pump outlet.

Pull the hose from the pump head.

14. Lift the motor/pump

Carefully lift out the motor/pump out of the rear cabinet.

15. Remove the old hose

Before pulling out the hose take a marker pen and make a line were the hose goes into the hose reel tube. Normally the easiest way to extract the old hose is by pulling it in the direction of the arrow. Keep feeding the hose trough the hose reel pipe as you pull.

Line up the new and old hose. Transfer the marking you did on the old hose to the new hose.

16. Fit the new hose

Fitting the new hose is usually easiest by feeding it trough the hose reel pipe from the top. Stop when you have 5-8cm distance between the bottom of the cabinet and the hose connector. Check the marking you did against the hose reel pipe and adjust if necessary.

17. Move 90-degree bend to new hose

Pry loose the U-pin and remove the 90-degree bend from the old hose and fit it on the new hose. Secure the bend by using the same U-pin you removed.

18. Reattach the internal hose

Carefully lower the motor/pump back into the pressure washer cabinet. With the motor/pump at an angle, reattach the internal high-pressure hose to the pump head.

Secure the hose using the U-pin. Some force may be required to properly secure the U-pin to the pump head.

19. Align the internal pressure hose

Make sure that the internal high-pressure hose runs trough these two depressions in the back cabinet (red arrows). If you are unable to fit the motor/pump properly then lift it up and check that the internal hose is routed as indicated in this picture.

20. Align the motor/pump

If the previous step was successful the motor/pump unit should now fit correctly in the back cabinet.

Reattach the power cable strain relief into the slot in back cabinet.

21. Secure the motor/pump

Secure the motor/pump unit using 4 T25 screws. Two screws on top of the motor cowling and two screws on the pump head cover.

21. Attach the front cover

Put the front cover back onto the pressure washer. A bit of work may be needed to get it to align perfectly with the back cabinet, take your time. Push the front brace release button to allow for a correct alignment of the brace. When you are happy with your alignment, raise the pressure washer to the upright position.

22. Fasten the front cover

Secure the front cover with six T25 screws from the backside of the pressure washer.

23. Reattach the water filter

Check that the filter cassette is clean and without damage.

Reattach the water filter to the water inlet.

24. Fit the internal hose

Fit the hose to the left side hose reel holder as indicated in the pictures.

The end of the hose should reach approximately to the centre of the reel holder.

25. Connect the hose to the swivel

Connect the hose to the swivel in the hose reel.

Secure the hose with a U-pin.

26. Assemble the hose reel

Attach the hose guide to the left reel holder.

Put the two reel holders together over the reel tube.

27. Securing the hose reel

Secure the left and right reel holder with 5 Torx screws.

28. Attach the handle

Reattach the handle. It should click into place.

Check that the hose reel can rotate freely. Reel in the hose.

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.