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SB-2-290
Page 5
TROUBLESHOOTING
Condition
Couse
Cornctlon
Heavy
top or
''
Hom holes
plugged.
Clean. Ream with non-metallic poim.
bottom
pattern
Obstruction on top or bottom
of
fluid tip.
Clean.
Cap and/or tip seat dirty.
Clean.
Heavy right
or loft
side
pattern
Loft or right side horn
holes
plugged.
Clean.
Ream
with non-metallic poim.
Dirt on loft or right side
of
fluid tip.
Clean.
) (
Remedies for the top-heavy, bottom-heavy, right·heevy and left·heavy patterns:
11 Determine if the obstruction is on the
air cap
or the fluid tip.
Do
this
by
making a test spray
pattern.
Then, rotate the cap OlliH1all turn
and apray another
pattern. If the defect Is
inverted,
obstruction is on the air cap. Clean the
air
cap as previously Instructed.
21 If the defect is not inverted,
~
is on the fluid tip.
Check
for a fine burr on the edge
of
the fluid tip.
Remove
with #600 wet or dry sand
paper.
3) Check for dried paint just inside the opaning.
Remove
paint
by
washing with
solvent.
Heavy center pattern
Ruid pressure too high for atomization
Balance air and fluid
pressure .
•
air (pressure
feed).
lncreaea sprey
pattern
width with
spreader adjustment valve.
Motorial flow axcaeds air cap's capacity.
Thin
or lower fluid flow.
Spreader adjustment valva set too low.
Adjust.
Atomizing pressure too
low.
Increase pressure.
Meteriai too thick.
Thin
to proper consistency.
Spl~
spray pattern
I
Atomization air pressure too high.
Reduce et tranaformer or gun.
Fluid pressure too low.
1..,.._ fluid prasaure (increaees gun
hondlngspeed).
Spreader adjusting valve set too high.
Adjust.
Jerky
or fluttering spray
*Loosa
or damaged fluid tip/saat.
Tighten or replace.
fitlllll'
Motorial level too low.
Re!IU.
Obstruction in fluid
peaeago.
Backfluah with
solvent.
Dry orlooea fluid needle packing nut.
Lubricete or tighten.
Unable to get round spray
Spreeder adjustment screw
not eesting propeo1y.
Clean or replace.
Air cap retaining ring loose.
Tighten.
Will not spray
No air pressure
at
gll'l.
Check
air supply
and air
lines.
Fluid needle adjusting screw not
open
enough.
Opan fluid
naedla
adjusting
screw.
Starved sprey pattern
Inadequate meteriai flow.
Back
fluid
adjusting
screw
out
to
first thread
or increasa fluid pr-.ra et tank.
Excessiva overspray
Too much atomization air
pr-.ra
Reduce
pressure.
Gun too far from
work
surface.
Adjust to proper
distance.
Improper stroking (arcing, gun motion too faa!).
Move at modorete pace, parallel
to work
surface.
Exceeaive fog
Too
much,
or too faat-<lrying thinner.
Remix
property.
Too much atomization
air pressure.
Reduce
pressure.
Dry Spray
Air pressure too high.
Reduce air
pressure.
Gun
tip
too far from work surface.
Adjust to proper distance.
Gun motion too fast.
Slowdown.
Gun out
of
adjustment
Adjust.
Fluid leaking from packing nut
Packing nut loose.
Tighten,
do not bind needle.
Packing
worn
or dry
Replace or lubricate.
Ruid leaking or dripping from
Packing
nut too
tight
Adjust
front
of
prasaura feed gun
Dry packing.
Lubricete.
Fluid
tip
or needle worn or damaged.
Rlaplace tip & needle with lapped seta.
Foreign
matter
in
tip.
Clean.
Fluid needle
spring
broken.
Rlaplace.
Wrong size needle or tip.
Rlaplace.
*Most common problem.
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