Cleaning and maintaining your spray guns may be burdensome and will take a lot of time, not to mention how frustrating it is when it starts to have problems and break down halfway through a paint job.
Most defects usually have shared underlying causes to them, and knowing these will help remedy the defects before they continue to implicate damage on your spray gun
Defect # 1 :The cup is spitting or fluttering spray fan or air bubbles
One of the causes is that the fluid tip might not have been properly sealed or tightened, and the other cause could be that the air distribution ring might be clogged or damaged.
If it’s the first cause, you can obviously just tighten the fluid tip using a universal spanner. If it’s the second cause then you can exchange the air distribution insert as cleaning will not be possible since it will get damage when you disassemble it.
Defect # 2 : The spray pattern ends up splitting, too small, lop-sided or crooked
It might be because of a fluid tip aperture or a damaged fluid tip, another cause would be that drillings of the air cap might be clogged with cleaning solution or paint
If it is because of fluid tip aperture, you can make sure that the fluid tip hasn’t been damaged and if it’s necessary, you can change the complete nozzle set.
Defect # 3: There doesn’t seem to be a function of flat/round fan control, although the adjustment knob is still able to be turned.
It could be because of the air distribution insert that has not been positioned in the right location, like when the pin isn’t located in the drilling, or it could be completely damaged.
You can solve this by exchanging the air distribution insert while ensuring that the installation is in correct position, that the fixation pin is located in the drilling.
Defect # 4: There doesn’t seem to be a function of flat/round fan control, and the adjustment knob can no longer be turned.
It could be because the control knob might have been turned counterclockwise instead of clockwise that probably caused the spindle to loosen the gun thread.
You can solve this by completely removing the control knob with the universal spanner in the clock wise direction. Then you can reinstall the control knob to the spray gun’s body, then seal the thread with superglue before you tighten the universal spanner or change it completely.
Defect # 5: The spray gun does not shut off air
This might be caused by a worn air piston or the clogging of the air piston seat.
You can easily solve this by cleaning the air piston seat or changing the overall air piston and its packing.
Defect # 6: There’s corrosion on the spray gun body, inside the cup connection and material passages, as well as the air cap thread
This might be because of residue water-based cleaning agent and/or areas that have not been blown-dry well after washing, or it could also be due to using cleaning solutions that are not pH-neutral and are deemed inappropriate for such equipment.
You can solve this by unscrewing air cap after cleaning and blow-drying air cap or spray gun from the outside and inside. You can also use pH-neutral cleaning agents and/or rinse the gun thoroughly with neutral solution. Consult the usage directions on your cleaning agent before doing this.
Defect # 7: You see a black digital display
This could be due to three reasons; first, your spray gun may have been completely soaked in the cleaning solution. Second, your spray gun may have been left in the washer for too long, maybe overnight. Lastly, cleaning solution was blown in to the spray gun while the air cap was removed and the spray gun head was pointing upwards.
You can learn from this cause by making sure you don’t completely soak your spray gun in cleaning solution anymore. Secondly, you can take the spray guy out of the solution right after wash and completely blow-dry. Lastly, ensure that the nozzle head is always pointing upwards when you clean the spray gun.
Next article: Paint sprayer and all about its’ tip
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