Instruction manual

10
11
AIRLESS SPRAY GUN TROUBLESHOOTING
DEFECTS CAUSE CORRECTION
Coarse spray Low pressure Increase the pressure
Excessive fogging
(overspray)
High pressure
Material too thin
Reduce the pressure to satisfactory pattern distrabution
Use less thinner
Patten too wide Spray angle too large Use smaller spray angle tip
Pattern too narrow Spray angle too small Use larger spray angle tip (if coverage is OK, try tip in same
nozzle group)
too much material Nozzle too large
Material too thin
Pressure too high
Use smaller nozzle
Reduce pressure
too little material Nozzle too small Use next larger nozzle
Material too thick
thin distribution in center
of pattern “horns”
Worn tip
Wrong tip
Change to new tip
Use nozzle with narrow spray angle
Thick skin of work Material too viscous
Application too heavy
Thin cautiously
Reduce pressure and/or use tip in next smaller nozzle group
Coating fails to close &
smooth over
Material too viscous Thin cautiously
Spray pattern irregular,
deected
Orice clogged
Tip damaged
Clean carefully
Replace with new tip
Craters or pock marks,
bubbles on work
Solvent balance Use 1 to 3% “short solvents remainder “long” solvents
(this is most likely to happen with material of low viscosity,
lacquers, etc.)
Clogged screens Extraneous material in paint
Course pigments
Poorly milled pigments
(paint pigments glocculate)
Clean screen
Use coarse screen if orice size allows.
Use courser screen, larger orice tips. Obtain ball milled
paint. If thinner has been added, test to see if a cover
screen. Incompatible drop placed on top of paint mixes or
attens out on the paint mixture & thinners on the surface. If
not, try different thinner in fresh batch of paint.
Excess paint builds on
tip guard
Spray gun too close to
surface
Pressure setting too high
Hold gun further from surface sprayed
Reduce pressure setting
Drips, spits from tip Valve seat and/or ball in gun
head damaged or worn
Service spray gun, replace valve assembly
Tip clogs continually Debris in paint
Gun lter missing
Coarse lter mesh
Thouroughly strain the paint before use
Do not operate without inlet strainer
GOOD, FULL
SPOTTY PATTERN, INCREASE PRESSURE
TEST THE PATTERN