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Problem
A.
Little or no paint flow
B.
Paint leaking
C.
Paint is backing up past the
check valve
D.
Poor spray pattern
E.
Pulsating spray
F.
Pattern is heavy in the middle
G.
Gun spitting paint
H.
Paint build up on the air cap
I.
Too much overspray
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Troubleshooting
Cause
1.
Dried paint blocking fluid nozzle
2.
No air pressure in paint cup or pot
3.
Check valve in air tube plugged
4.
No fluid pressure
5.
Blockage in material hose
1.
Improper size needle or nozzle
2.
Damaged needle or nozzle
3.
Loose nozzle
4.
Loose packing nut
5.
Needle not closing properly
1.
Gun is being tilted too much when it is not
spraying
2.
Check valve leaks
1.
Air holes in air cap ears are clogged
2.
Nozzle is clogged
3.
Damaged nozzle or needle
1.
Loose or damaged packing
1.
Too much fluid pressure
1.
Valve in air tube is not operating properly
2.
Material too thick
3.
Projector set is too small.
1.
Improper adjustment of cap
1.
Air pressure too high
2.
Material too thin
3.
Spray gun too far from surface
Solution
1.
Disassemble and clean
2.
Inspect air tube, cup or pot gasket, clean or replace.
3.
Clean or replace the check valve assembly
4.
Check material supply
5.
Clean by flushing with solvent
1.
Replace
2.
Replace
3.
Tighten
4.
Tighten
5.
a) Loosen packing nut
b) Replace needle spring
c) Remove dried paint from needle
1.
Tilt the gun only when spraying
2.
Clean or replace the check valve
1.
Remove and clean air holes
2.
Clean with appropriate solvent
3.
Remove and replace
1.
Tighten or replace
1.
Reduce pressure
1.
Replace valve assembly
2.
Thin material
3.
Install the proper projector set.
1.
Adjust the air cap properly so that paint flows freely
through the cap
1.
Reduce air pressure
2.
Add unthinned paint
3.
Move closer
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