Troubleshooting Chart - Finish Quality - Campbell Hausfeld HVLP Operating Instructions & Parts Manual

Operating Instructions and Parts Manual
Troubleshooting Chart
Symptom
Spray not uniform
(spitting)
Poor pattern
Overheating
Poor air flow
Spray tip clogs

Troubleshooting Chart - Finish Quality

Symptom
Orange Peel
(Rough rolling
appearance similar to
an actual orange
peeling)
Runs and sags
Pin-holing and solvent
pops
Fish eye
Blistering
Lumpy, coarse surface
Mottled surface finish
NOTICE
!
• Weather conditions can cause unsatisfactory results when spraying some coatings.
• High humidity prolongs set, and cure times.
• High temperatures decrease set, and cure times.
• Cold temperatures extend set, and cure times.
• Variations in temperature, and humidity can cause variations in finish quality.
• Coating manufacturers can recommend additives to resolve some of these problems, and should be contacted for
assistance with particular problem resolutions.
Possible Cause(s)
1. Material too thick
2. Wrong needle/nozzle assembly
3. Cup seal leaking
4. Loose packing
5. Material not properly mixed or im-
properly filtered
1. Material buildup on nozzle or air cap
2. Worn nozzle/needle
3. Clogged air cap
4. Material not properly mixed or im-
properly filtered
Clogged filter
1. Clogged filter
2. Air flow control improperly adjusted
1. Improper material flow adjustment
2. Cup seal leaking
3. Wrong needle/nozzle
Possible Cause(s)
1. Material drying too fast
2. Gun too far from surface
3. Material too thick
1. Material too thin
2. Moving gun too slow
3. Excessive material flow
4. Gun too close to surface
1. Trapped solvents
2. Pigment settling
3. System contamination
Possible silicone contamination
1. Moisture in/on surface
2. Incompatible top coats or under-
coats
Dirt on surface
1. Too much thinner
2. Poor spray technique
Corrective Action
1. Check material viscosity (Thin
per instructions)
2. Change to proper needle/nozzle
3. Tighten cup, replace seal or check valve
4. Adjust or replace packing
5. Strain paint
1. Clean nozzle and air cap
2. Replace
3. Clean
4. Strain paint
Replace
1. Replace filter
2. Adjust air flow control
1. Adjust material control
2. Replace cup seal
3. Change to proper needle/nozzle
Corrective Action
1. Use a slower solvent or add a retarding agent
2. Move gun closer to surface
3. Thin material per thinning instructions
1. Add material to increase thickness
2. Move gun more quickly
3. Turn material control knob clockwise to reduce
flow
4. Move gun further from surface
1. Apply material in lighter coats allowing solvents
time to evaporate
2. Possible bad material
3. Thoroughly clean all parts
1. Use solvent to clean all parts and work surfaces
1. Dry surface
2. Make sure coatings are compatible
Thoroughly clean surface
1. Reduce thinner
2. Refer to "Operation" for spraying instructions
6