Hitachi 308640 - Manual (Page 15)

308640 15
Troubleshooting
Spray Pattern Troubleshooting
Problem Cause Solution
Fluttering or spitting spray Insufficient fluid supply
Air in paint supply line
Attempting to “feather” (partially trig-
ger) the gun.
Adjust fluid regulator or fill fluid supply
tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Cannot “feather” with an AA gun.
Feathering will cause drastic reduc-
tion of pressure at the tip, resulting in
poor atomization and/or spitting.
Irregular pattern Fluid build-up or spray tip partially
plugged
On defective side of pattern, air horn
holes are partially or totally plugged
Clean spray tip. See page 11.
Clean air horn holes with solvent and
soft brush. See page 11.
Pattern pushed to one side, same
side of air cap gets dirty Air horn holes partially or totally
plugged Clean air horn holes with solvent and
soft brush. See page 11.