3M Series 56 Paint Sprayer User Manual


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39
Troubleshooting
Problem Cause Remedy
Bad Spray Pattern
Air cap or nozzle clogged Clean with appropriate solvent
Bentuidneedle Replaceuidneedle
Blistering
Moisture on surface Clean surface
Wrong solvent Check solvent
Coats not compatible Check material compatibility
Insufficient dry time Longer dry time
Surface too cold Warm surface
Fish Eyes
Air contamination Add air filtration
Silicone contamination Clean surface with solvent
Heavy Middle Pattern
Toomuchuidpressure Reduceuidpressure
Not enough atomizing pressure Increase atomizing pressure
Intermittent Pulsating Spray
Worn or loose packing Tighten or replace
Lowuidpressure Adduidorincreaseuidpressure
Insufficient Fluid Flow, Pressure Feed
RestrictioninuidlineBlockedhose Use3/8”uidhoseFlushorreplacehose
Fluid nozzle too small Use larger needle/nozzle
Lowuidpressure Increaseuidpressure
Coarse or Lumpy Surface
Dirt or dust on surface Tack wipe before spray
Material is contaminated Change or strain
Mottled Looking Surface
Coating too thin Use less thinner
Coats too wet Use less thinner
Improper spray technique Ensure gun is parallel to work
No Paint Flow
Cloggeduidnozzle Cleanuidnozzle
Lossofuidpressure Out of paint
Clogged air passage Clean with solvent
Restrictioninmat’lhose Flush with solvent
Clogged check valve Replacecheckvalve
Orange Peel
Paint drying too fast Use proper solvent
Gun too far from target 6-8 inches is ideal
Viscosity too high Reducewithsolvent
OversprayisExcessive
Gun too far from target 6-8 inches is ideal
Too much atomizing air for coating being
sprayed
Reduceatomizingair
Pin-Holing, Solvent Pops
Trapped solvent Apply lighter coats
Improper solvent Check coating manufacturer
System contaminated Clean all parts
Paint Leak
Wrong needle size Replace
Damaged-worn needle Replace
Looseuidnozzle Tighten or replace
Worn/loose packing nut Tighten or replace
Needle not closing
Packing too tight. Broken or missing needle
spring. Dried paint on needle.
Looseuidtting Tighten or replace
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