Troubleshooting Possible Problems In Operation - DeVillbiss TEKNA BASECOAT Boletín Técnico

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Troubleshooting Possible Problems
in Operation
CONDITION
Heavy top or
bottom pattern
Heavy right
or left side
pattern
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 nozzle. 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. Also check for dried paint just inside the cap center hole opening;
remove by washing with solvent.
2. If the defect is not inverted, it is on the fluid nozzle. Clean nozzle. Check for a fine burr on the edge of the fluid
nozzle. Remove with #600 wet or dry sandpaper.
Heavy centre
pattern
Split spray pattern
Jerky or fluttering spray
Unable to get round spray
Will not spray
Paint bubbles in cup
Fluid leaking or dripping
from cup lid
Starved spray pattern
Excessive overspray
Excessive fog
Dry spray
Fluid leaking from
packing nut
www.carlisleft.com
CAUSE
Horn holes plugged.
Obstruction on top or bottom
of fluid nozzle.
Cap and/or nozzle seat dirty.
Left or right side horn holes plugged.
Dirt on left or right side of
fluid nozzle.
Spreader adjustment valve set
too low.
Atomising pressure too low.
Material too thick.
Atomisation air pressure too high.
Fluid adjusting knob turned in
too far.
Spreader adjusting valve set too high.
*Loose or damaged fluid nozzle/seat.
Loose or broken cup fluid nipple.
Material level too low.
Container tipped too far.
Obstruction in fluid passage.
Loose fluid needle packing nut.
Damaged fluid needle packing.
Spreader valve not seating properly.
Air cap retaining ring loose.
No air pressure at gun.
Fluid adjusting knob not
open enough.
Fluid too heavy for gravity feed.
Fluid nozzle not tight.
Cup lid loose.
Dirty cup or lid.
Cracked cup or lid.
Inadequate material flow.
Low atomisation air pressure.
Too much atomisation air pressure.
Gun too far from work surface.
Improper stroking (arcing, gun motion
too fast).
Too much or too-fast-drying thinner.
Too much atomisation air pressure.
Air pressure too high.
Gun too far from work surface.
Gun motion too fast.
Gun out of adjustment.
Packing nut loose.
Packing worn.
*Most common problem.
14 / 16
CORRECTION
Clean. Ream with non-metallic point.
Clean.
Clean
Clean. Ream with non-metallic point.
Clean.
Turn out counter clockwise to achieve
proper pattern.
Increase pressure.
Thin to proper consistency.
Reduce at regulator or gun handle.
Turn out counter clockwise to achieve
proper pattern.
Turn in clockwise to achieve proper
pattern.
Tighten or replace.
Tighten or replace cup.
Refill.
Hold more upright.
Back flush with solvent.
Tighten.
Replace.
Clean or replace.
Tighten.
Check air supply and air lines, blow out
gun air passages.
Turn out counter clockwise.
Thin material and/or change to larger
fluid nozzle size.
Tighten to 18–20 nm (13-15 ft-lbs).
Push in or replace.
Clean.
Replace cup and lid.
Back fluid adjusting knob out or change
to larger fluid nozzle size.
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.
Tighten.
Replace.
TB-1018-R1 (2/2018)