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Operating Instructions and Parts Manual
Troubleshooting chart
Symptom
Possible cause(s)
Right or
left heavy
spray pat-
tern
Top or
bottom
heavy
spray pat-
tern
Split spray
pattern
Center
heavy
spray pat-
tern
Sputtering
spray
Fluid leaking from pack-
ing nut
Air leaking from air cap
without pulling trigger
Fluid leaking from fluid
tip of pressure feed
spray gun
Excessive overspray
Will not spray
1.
Holes in left or right side of the
air cap are plugged
2.
Dirt on left or right side of fluid
tip
1.
Dried material at top or bottom
of fluid tip
2.
Loose air cap or dirty seat
3.
Air cap plugged
1.
Fluid turned in too far
2.
Atomization air too high
1.
Material too thick
2.
Atomization pressure too low
1.
Material level too low
2.
Container tipped too far
3.
Loose fluid inlet connection
4.
Loose or damaged fluid tip/seat
5.
Dry or loose fluid needle packing
nut
6.
Air vent clogged
1.
Packing nut loose
2.
Packing worn or dry
1.
Sticking air valve stem
2.
Contaminate on air valve or seat
3.
Worn or damaged air valve or
seat
4.
Broken air valve spring
5.
Bent valve stem
1.
Packing nut too tight
2.
Fluid tip worn or damaged
3.
Foreign matter on tip
4.
Fluid needle spring broken
1.
Too high atomization pressure
2.
Too far from work surface
3.
Improper stroking (arcing, gun
motion too fast.)
1.
No pressure at gun
2.
Fluid control not open enough
3.
Fluid too heavy
corrective Action
1.
Clean. Use only non-metallic paint
2.
Clean
1.
Clean
2.
Clean and tighten
3.
Clean. Use only non-metallic paint
1.
Increase fluid
2.
Reduce atomization air pressure
1.
Thin to proper viscosity
2.
Increase atomization pressure
1.
Refill
2.
Hold more upright
3.
Tighten
4.
Adjust or replace
5.
Lubricate and or tighten
6.
Clear vent hole
1.
Tighten, but do not restrict needle
2.
Replace or lubricate (non-silicone oil)
1.
Lubricate
2.
Clean
3.
Replace
4.
Replace
5.
Replace
1.
Adjust
2.
Replace tip and/or needle
3.
Clean
4.
Replace
1.
Reduce pressure
2.
Adjust to proper distance
3.
Move at moderate pace, parallel to surface
1.
Check air lines
2.
Open fluid control
3.
Thin fluid or change to pressure feed system
7
HDS550
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