Spray Gun - Spray Gun Inspection and Troubleshooting
1. Spray Gun Inspection and Troubleshooting

Defects
Cause
Countermeasure
Out of air
1.
Not enough paint in the paint cup.
2.
The paint cup is tilted too much.
3.
The paint flow path is clogged.
4.
The paint nozzle deformed or damaged.
1.
Add paint.
2.
Correct the position.
3.
Clean with solvent.
4.
Close or replace.
Imbalance
1.
The air cap angle holes are partially clogged or damaged.
2.
Paint or contaminants deposited or damages on the tapered joint area of air cap and paint nozzle.
3.
Paint or contaminants deposited on the tip of the nozzle.
1.
Clean or replace.
2.
Clean or replace.
3.
Clean.
Crescent
1.
The air cap angle holes are clogged or damaged, or there are paint deposits or other damage inside the center hole.
2.
Paint or contaminants deposited or other damage to outside of the nozzle tip.
1.
Clean or replace.
2.
Clean or replace.
Oval
1.
The bore of the paint nozzle is too large or has become worn.
2.
Too much space between the air cap’s center hole and the outside of the nozzle tip became bigger.
3.
Low air flow and pressure to the air cap.
4.
Paint viscosity too high.
1.
Replace.
2.
Replace.
3.
Increase air flow and pressure.
4.
Reduce viscosity.
Constriction
1.
Air flow and pressure to the air cap’s angle holes too high.
2.
Paint or contaminants deposited or other damage to outside of the nozzle tip.
1.
Reduce air flow and pressure.
2.
Clean.


Judging Defect Type of Spray Pattern

Check the spray pattern. Then loosen the air cap and turn it 180 ° and spray again. If both of the spray patterns appear identical, the problem is contamination on the paint nozzle or a damaged paint nozzle.
If the spray patterns appear reversed, the problem is contamination on the air cap or a damaged air cap.