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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 insufficient
atomization.
Hose size or length is too small or too
long.
Dirty filter.
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 preorifice
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-orifice 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
filter and/or gun screen.
Use 100 mesh gun screen instead of 50
mesh for small spray tips. Use 100 mesh
screen in pump filter. Strain paint.
D. Spray pattern changes with pump
cycle.
Restrictions in the fluid system.
Check gun and pump filter screens.
Always clean screens before they load up.
E. Irregular flow 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
fittings 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 fluid.
Suction hose leak.
No paint.
Plugged foot valve.
Plugged filters or tip.
Ball check valve stuck open.
Inspect for siphon hose leak.
Check fluid supply.
Remove, clean, inspect foot valve.
Clean filters or tip.
Clean and inspect pump ball check valve.
Troubleshooting - Spray Patterns
condition
Possible cause
correction
A. Tails
Inadequate fluid delivery.
Fluid not atomizing correctly.
Increase fluid pressure. Change to small
tip orifice size. Reduce fluid viscosity.
Reduce hose length.
Clean gun and filter(s). Reduce number of
guns using pump.
B. Hour glass
Inadequate fluid delivery.
Same as above.
C. Distorted
Plugged or worn nozzle tip.
Clean or replace nozzle tip.
D. Pattern expanding and contracting
(surge)
Suction leak.
Pulsating fluid delivery.
Inspect for siphon hose leak.
Change to a smaller tip orifice size.
Install pulsation dampener in system or
drain existing one. Reduce number of
guns using pump.
Remove restrictions in system, clean tip
screen if filter is used.
E. Round pattern.
Worn tip.
Fluid too heavy for tip.
Replace tip.
Increase pressure. Thin material. Change
nozzle tip.
