Orifice or Nozzle Assembly Replacement
Orifice and nozzle tip are two consumable parts of the nozzle assembly. Their life is projected to be around 300 hours. If they start to degrade, the cut quality will be affected. Moreover, debris in the water may damage or clog the orifice; collision with the cut material may damage the nozzle tip. Replacement of the orifice or entire nozzle assembly will become necessary.
Required Tool
PPE (gloves, masks and eye goggles)
Sprayer
Cleaning rag or paper towel
11mm, 28mm, 17mm wrench
4mm allen key
Pliers
Masking tape
Parts Needed
WAZER Pro orifice
Banjo Bolt Bonded washers
Procedure
Preparation
Put on PPE
Turn off WAZER Pro
Shut of water supply
Orifice Replacement
1. Wait for the machine to fully dry off and brush off all abrasives around the Nozzle and the door window. Or use the sprayer to rinse the area around the nozzle assembly and banjo bolt
2. Loosen and remove the knurled z-axis height adjustment knob.
3. Use a 4mm hex wrench to remove the two bolts securing the Nozzle assembly to the Gantry.
4. Use masking tape to cover up the exposed holes while you are working
5. Loosen and remove the knurled guard on the Nozzle
6. Once the Nozzle is exposed it should easily slide down and out.
7. Gently peel up the Z-Axis Bellow from the Mixing Chamber.
8. Use 11mm and 28mm wrench to unscrew Mixing chamber from Guide rod.
9. Use masking tape to cover the bottom of Guide Rod.
10. The Orifice is now exposed in the body of the Mixing Chamber, you can see a tiny hole in the middle.
11. Remove the Orifice from the Mixing Chamber by whacking it against your palm.
12. Use a toothpick or metal dental pick to remove debris from the threads both inside and outside.
13. Before replacing the Orifice with a new one, do a thorough cleaning of the Mixing Chamber.
14. There is an orifice included in your spare parts kit.
15. Place a new Orifice into the Mixing Chamber with the brass ring facing you.
16. Clean off all the Blue Goop from Guide Rod thread, inspect the thread. Make sure no abrasive is stuck in the thread.
17. Reapply Blue Goop and reassemble the Mixing Chamber and Guide Rod. Pay attention to the smoothness when threads engage. Stop and clean immediately when you feel any grinding.
18. Use 11mm and 28mm wrench to tighten them to 50Nm (37ft-lbs)
19. Reassemble the nozzle with white collar, and knurled guard together. Make sure Nozzle is properly seated.
20. Pull the lower Bellow lip back into the groove.
21. Re-install the Nozzle assemble onto the Gantry using the two M5 bolts.
22. Make sure nozzle assembly is perfectly vertical, reapply z-axis height adjustment knob
23. Conduct a “nozzle” purge to prime the high pressure system.
Nozzle Assembly Replacement
1. Remove the two bolts securing the Nozzle to the Z block using a 4 mm Allen key.
2. 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.
3. 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.
4. Remove all tools from cut bed. Leave the banjo assembly unconnected, turn on water supply into the pump box, turn on WAZER, go to “Setup & Maintenance“ > “Maintenance“ > “nozzle purge”. Use the output water stream to rinse the banjo assembly.
5. Remove the red plug from the end of the new Nozzle.
6. Reinstall the banjo bolt into the new Nozzle. Make sure there is a sealing washer on either side of the banjo fitting
7. 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.
8. Reinstall the nozzle to the Z-block.
9. Conduct a “nozzle” purge to prime the high pressure system
Last Check
1. it is important to pay attention to the Whip orientation.
2. The “Whip” is the bundle of wires and hoses inside the tank. Check if the Whip always curls up when the nozzle travels to the rear of the tank.
3. We want the Whip to stay oriented in an upwards fashion in every direction the nozzle moves.
4. The Whip Caretaking Article can be found in this page