TROUBLESHOOTING
CONDITION
CAUSE
CORRECTION
Heavy top or
bottom pattern
Heavy right or left
side pattern
Heavy center pattern
Split spray pattern
Jerky or fluttering spray
Unable to get round spray
Will not spray
Runs and sags
Starved spray pattern
Excessive overspray
Excessive fog
Dry spray
Fluid leaking from packing nut
Fluid leaking or dripping from
front of gun
Horn holes plugged.
Obstruction on top or bottom of fluid tip.
Cap and/or tip seat dirty
.
Left or right side horn holes plugged.
Dirt on left or right side of fluid tip.
Remedies for the top-heavy, bottom-heavy, right-heavy, and left-heavy patterns:
1.
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 one-half
turn
and spray another
pattern.
If the defect is inverted,
obstruction is on the air cap. Clean the air cap as previously instructed.
2.
If the defect is not inverted, it is on the
fluid
tip.
Check for a
fine
burr
on the edge of the
fluid
tip. Remove with #600 wet or dry sand pape
r
. or replace fluid tip
3.
Check for dried paint just inside the opening; remove by washing with solvent.
Clean. Ream with non-metallic point.
Clean.
Clean.
Clean. Ream with non-metallic point.
Clean.
Fluid flow too high for atomization ai
r
.
(Pressure Feed)
Material flow exceeds air cap's capacit
y
.
Spreader adjustment valve set too low.
Atomizing pressure too low.
Material too thick.
Atomization air pressure too high.
Fluid flow too low.
Spreader adjusting valve set too high.
*Loose or damaged fluid tip/seat.
Material level too lo
w.
Container tipped too far
.
Obstruction in fluid passage.
Dry or loose fluid needle packing nut.
Loose or broken fluid tube or fluid inlet nipple.
Spreader adjustment screw not seating
properly
.
Air cap retaining ring loose.
No air pressure at gun.
Fluid needle adjusting screw not open enough.
Fluid too heavy for gravity feed.
Fluid pressure too low.
T
oo much material flow.
Material too thin.
Gun tilted on an angle or gun motion too slow.
Inadequate material flow.
Low atomization air pressure (suction feed).
T
oo much atomization air pressure.
Gun too far from work surface.
Improper stroking (arcing, gun motion too
fast).
T
oo much or too fast-drying thinne
r
.
T
oo much atomization air pressure.
Air pressure too high.
Gun tip too far from work surface.
Gun motion too fast.
Gun out of adjustment.
Packing nut loose.
Packing worn or dr
y
.
Packing nut too tight.
Dry packing.
Fluid tip or needle worn or damaged.
Foreign matter in tip.
Fluid needle spring broken.
W
rong size needle or tip.
Balance air
pressure
and
fluid
flow.
Increase
spray pattern
width
with
spreader
adjustment
valve.
Thin or lower fluid flow.
Adjust.
Increase pressure.
Thin to proper consistency
.
Reduce at compressor or gun.
Increase
flu
id
flow
(increases
gu
n handling speed
).
Adjust.
T
ighten or replace.
Refill.
Hold more upright.
Backflush with solvent.
Lubricate or tighten.
T
ighten or replace.
Clean or replace.
T
ighten.
Check air
supply
and air lines,
blow
out
gun
air
passages.
Open fluid needle adjusting screw.
Thin material and/or change to larger tip size.
Increase fluid pressure at tank.
Adjust gun or reduce fluid pressure.
Mix properly or apply light coats.
Hold gun at right angle to work and adapt to
proper gun technique.
Back fluid adjusting screw out to first thread,
or increase fluid pressure at tank.
Increase air pressure and rebalance gun.
Reduce pressure.
Adjust to proper distance.
Move at moderate pace, parallel to work
surface.
Remix properly
.
Reduce pressure.
Reduce air pressure.
Adjust to proper distance.
Slow down.
Adjust.
T
ighten, do not bind needle.
Replace or lubricate.
Adjust.
Lubricate.
Replace tip and needle with lapped sets.
Clean.
Replace.
Replace.
*Most common problems.
4
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