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Troubleshooting - Airless Spraying
Condition Possible Cause Correction
A. Poor spray pattern and / or tails at
top and bottom of the spray pattern.
Worn or incorrect tip and/or insufcient
atomization.
Hose size or length is too small or too
long.
Dirty lter.
Be sure the tip is not worn. Increase
pressure. Lower viscosity. Reduce
surface tension by increasing hose size to
minimize pressure drop through hose and/
or reduce hose lengths. Use preorice
disc (H disc).
B. The gun drips or throws a drop at
the beginning or end of the spray
pattern.
Needle may not be seating correctly.
Increase spring tension.
Needle-orice combination should be
factory relapped. Needle packing may
be too tight. Loosen as much as possible
without leakage.
Turn adjusting screw on back of gun
clockwise to increase tension or use the
green HP spring Part # 701-098.
C. Spray tip stops up frequently. Particles too large for spray tip are passing
lter and/or gun screen.
Use 100 mesh gun screen instead of 50
mesh for small spray tips. Use 100 mesh
screen in pump lter. Strain paint.
D. Spray pattern changes with pump
cycle.
Restrictions in the uid system. Check gun and pump lter screens.
Always clean screens before they load up.
E. Irregular ow of material. One
stroke faster than the other.
Packings are worn or valve balls are not
seating.
Restriction in the siphon system.
Check siphon hose assembly to be sure no
air is entering, then recheck all threaded
ttings for leakage. See Troubleshooting
- Fluid Section for additional service
information.
F. Spitting. Air in system.
Dirty gun.
Inspect for siphon hose leak.
Disassemble and clean gun.
G. Gun does not spray any uid. Suction hose leak.
No paint.
Plugged foot valve.
Plugged lters or tip.
Ball check valve stuck open.
Inspect for siphon hose leak.
Check uid supply.
Remove, clean, inspect foot valve.
Clean lters or tip.
Clean and inspect pump ball check valve.
