Finex FX300 - Troubleshooting

4 310746F
FINEX HVLP AND CONVENTIONAL SPRAY GUNS
Troubleshooting
WARNING
Follow Pressure Relief Procedure, page 1, before troubleshooting or servicing. Read warnings, page 2.
Problem Cause Solution
One side of air cap (1) dirty or clogged Clean air cap orifices. See page 3. Blow air through orifices until
clean. If air cap holes are damaged, replace air cap.
a. Loose air cap (1). a. Tighten.
b. Dried or damaged air cap (1) or fluid nozzle (2). b. Rotate air cap 180°.
If pattern follows air cap, problem is in air cap. Clean and inspect.
See page 3. If pattern is not corrected, replace air cap.
If pattern does not follow the air cap, the problem is with the fluid
nozzle. Clean and inspect the nozzle. See page 3. If the pattern
is not corrected, replace nozzle.
a. Atomization air pressure set too high. a. Reduce air pressure.
b. Spraying a thin material in too wide of a pattern. b. Increase material control by turning fluid adjustment knob (20) to
left, while reducing spray width by turning pattern adjustment
knob (7) to right.
Or increase material viscosity.
Air getting into paint stream.
a. Cup almost empty. a. Fill cup.
b. Dry needle packing (3). b. Loosen packing seat (4) and put a few drops of machine oil on
packing (3). Retighten seat (4).
c. Fluid nozzle (2) too loose. c. Tighten.
d. Dried material between nozzle (2) and gun
body.
d. Clean nozzle and front of gun. See page 3.
e. Damaged needle seal e. Replace seal. See page 5.
Other spray pattern
problems
a. Gun not properly adjusted. a. See page 3.
b. Sluggish needle (18). b. Clean and lubricate.
Unable to get round
pattern.
Pattern adjustment knob (7) not seating properly. Clean or replace knob.
Will not spray. a. No air pressure at gun. a. Check air supply and air lines.
b. Cup empty. b. Fill cup.
c. Fluid adjustment knob (20) turned too far right. c. Adjust knob (20) to the left.
d. Fluid too thick for gravity feed. d. Thin material.
Fluid leaking from
packing nut (4).
a. Packing nut (4) loose. a. Tighten, but not so tight as to grip needle.
b. Packing (3) worn or dry. b. Lubricate or replace.
Fluid nozzle (2) dripping. a. Dry packing (3). a. Lubricate.
b. Sluggish needle (18). b. Clean and lubricate.
c. Packing nut (4) too tight. c. Loosen.
d. Worn fluid nozzle or needle. d. Replace.
Thin, coarse finish. a. Gun held too far from surface. a. Hold gun about 6-8 inches (150-200 mm) from surface.
b. Atomization air pressure set to high. b. Reduce air pressure.
Thick, dimpled finish
(resembling orange peel)
Gun held too close to surface. Hold gun about 6-8 inches (150-200 mm) from surface.
Spitting