AIRLESSCO GS6250 - Manual (Page 21)

Troubleshooting
3A1187E 21
Clutch Assembly Measure resistance between the clutch leads
(black). This value must be 10-16 ohms. If this
reading is out of specifications, the clutch is
defective and must be replaced.
If the clutch resistance readings are correct,
check spacing between the clutch field and
plate. The gap should be .012” to .024”. If the
gap is greater than .024 the gap is too wide and
the spacer should be removed from the clutch
assembly. If the clutch still does not engage,
replace the clutch assembly. See Clutch
Replacement, page 17.
Electrical Control Board If the magneto and sensor are functioning,
replace the electrical control board.
Problem Cause Solution
Airless Spray Gun
Problem Cause Solution
Coarse spray Low pressure Increase the pressure
Excessive fogging (overspray) High pressure Reduce the pressure to satisfactory pattern dis-
tribution.
Material too thin Use less thinner
Pattern 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 tip group)
Too much material Nozzle too large Use smaller nozzle
Material too thin
Pressure too high Reduce pressure
Too little material Nozzle too small Use next larger nozzle
Material too thick
Thin distribution in center of
pattern “horns” Worn tip Change to new tip
Wrong tip Use nozzle with narrow spray angle
Thick skin on work Material too viscous Thin cautiously
Application too heavy Reduce pressure and/or use tip in next smaller
tip size
Coating fails to close and
smooth over Material too viscous Thin cautiously
Spray pattern irregular,
deflected Orifice clogged Clean carefully
Tip damaged Replace with new tip
Craters or pock marks, bub-
bles on work Solvent balance Use 1 to 3% “short solvents remainder “long”
solvents (this is most likely to happen with mate-
rial of low viscosity, lacquers, etc.)