Troubleshooting - DeVilbiss COBRA 3C Operation Manual

Possible Problems in Operation
CONDITION
Spray Pattern
Heavy top or
bottom pattern.
Heavy right or left
side pattern.
Remedies for the top-heavy and bottom-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 centre hole opening;
remove by washing with solvent.
2. If the defect is not inverted, it is on the fluid nozzle. Clean nozzle. If problem persists, renew nozzle.
Heavy centre
pattern.
Split spray
pattern.
Jerky or
fluttering spray.

Troubleshooting

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.
Fan Air pressure set too low.
Material too thick.
Fluid Flow set too low.
Fan Air pressure set too high.
Material level too low.
Obstruction in fluid passage.
14
CORRECTION
Clean with non-metallic point.
Clean.
Clean.
Clean with non-metallic point.
Clean.
Increase Fan Air pressure to
achieve correct pattern.
Thin to correct consistency.
Increase Fluid Flow to achieve
correct pattern.
Decrease Fan Air pressure to
achieve correct pattern.
Refill.
Back flush with solvent.
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