Cleaning or Replacing Nozzle Filter Core
The nozzle filter core is the last defense in the high pressure system before the water reaches the smallest and most important part: jewel orifice. Overtime, the filter core will gradually be gunked and clogged by the silt and debris in the high pressure water stream. Cleaning the filter core is important. Perform the cleaning regularly to prevent hours of repair work in the long run. We recommend cleaning the nozzle filter core every 20-100 hours of cutting depending on the water quality in your region.
Required Tools
PPE (Gloves, masks and eye Protection)
Sprayer
Tape
17mm wrench
4mm allen key
Adjustable plier or 28mm wrench
Paper towel
Old toothbrush or pipe cleaner
Needle, dental pick or tooth pick
A wooden plank
Parts Needed
A new Nozzle Filter Core (if needed)
Procedure
Shut off water supply into the WAZER Pro, turn off the WAZER Pro
2. Use the sprayer to wash the areas around the banjo bolt, on top of the nozzle. Use a paper towel to wipe clean and ensure there is no abrasive or silt around the nozzle.
3. Remove the Z-height adjustment knob. Remove the two bolts securing the Nozzle to the Z block using a 4 mm Allen key.
4. Remove the Banjo bolt from the Nozzle by holding the mixing chamber with a pair of pliers while loosening the bolt with a 17 mm wrench
5. Be careful not to lose the 2 sealing washer on either side of the banjo fitting. If they look particularly worn they can be replaced
6. With the nozzle assembly removed from the machine, turn it upside down, and knock it onto a soft surface. This will generally knock the filter core out from the guide rod.
If the filter core appears to be stuck in the guide rod, use a needle, dental pick or toothpick to pry it loose, and knock it out
7. Put a piece of tape on the guide rod opening. This will prevent dust or debris from falling into the guide rod and contact the jewel orifice directly.
8. Rinse the filter core under a faucet. Use an old toothbrush or a pipe cleaner to clean the filter
9 . After the filter core is clear to the eye, you may carry on the installation.
If the filter core is twisted, damaged or torn, refrain from using it. Replace the filter core.
10. Remove the tape covering the opening of the guide rod, install the cleaned or new filter core.
The filter core has an open end and closed end. Point the opening end towards the orifice, and keep the closed end towards the guide rod top opening.
You should see the filter core sits in place like illustrated in the picture
11. Remove all tools from the cut bed. Leave the banjo assembly unconnected, turn on water supply into the pump box, turn on WAZER, go to “Setup & Maintenance“ >”input and output check” > “HP Valve 3x”. Use the low pressure water to rinse the banjo assembly.
If you are performing this activity on a WAZER Pro, go to “set up and maintenance” > “maintenance” > “nozzle purge” .
12. Reinstall the banjo bolt into the new Nozzle. Make sure there is a sealing washer on either side of the banjo fitting
13. Tighten the bolt to 18 Nm using a 17 mm socket on a torque wrench. Take care to make sure the hose is aligned or pointed to the rear. The wires/cables should point straight to the back, and the abrasive inlet port will be accessible on the left side of the cutting head
14. Reinstall the nozzle to the Z-block. Using the 4mm Allen key and bolts.
15. After securing the cutting head to the gantry block, prime the High Pressure System by going to the ““Setup & Maintenance“ >”input and output check ” > “HP Valve 3x”.
If you are performing this activity on a WAZER Pro, go to “set up and maintenance” > “maintenance” > “nozzle purge” with the pressure relief bolt removed.
See “Wazer Pro HP system priming”
16. Finally it is important to pay attention to the Whip orientation. The “Whip” is the bundle of wires and hoses inside the tank. Please check if the Whip always curls up when the nozzle travels to the rear of the tank. Essentially, we want the Whip to stay orientated in an upwards fashion in every direction the nozzle moves.
Related Topics
Low pressure and high pressure system priming
Next Time
If you are in the areas where water hardness is high, you need to clean the filter core more often.
Keep the work area clean. Opening the banjo bolt also gives a chance for the dust and debris in the air to get into the nozzle assembly. The last thing you would like to see is to find the orifice is clogged after putting back the nozzle.