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Note: The drawings on the left below resemble symptoms of spray pattern problems.Refer to the accompanying possible
causes and likely solutions to the right.
Troubleshooting - Spray Pattern Diagnosis
Problem
Possible Causes
Likely Solutions
Heavy center
pattern
1. Pattern Knob partially
closed.
2. The paint is too thick.
3. The air pressure is too low.
1. Open Pattern Knob more.
2. Thin paint according to the
manufacturer’s instructions.
3. Increase air pressure within
the Operating Air Pressure.
Light center
pattern
1. High air pressure.
2. Fluid Knob not open
enough.
3. Pattern Knob open too far.
1. Reduce air pressure.
2. Open Fluid Knob.
3. Partially close Pattern
Knob.
Heavy top/
bottom
pattern
1. Nozzle plugged.
2. Nozzle loose or dirty seal.
3. Dried paint on Fluid Tip.
4. Damaged Fluid Needle.
1. Clean Nozzle.
2. Clean and tighten Nozzle
and seal.
3. Use a nonmetallic point to
clean Fluid Tip.
4. Replace Fluid Needle and
Fluid Tip
Pattern on
right
or left only
1. Dirt on one side of Fluid
Tip.
2. Holes on one side of
Nozzle are plugged.
3. Damaged Fluid Needle.
1. Tighten or replace.
2. Refill paint Cup.
3. Backflush with solvent.
4. Lubricate or tighten
Packing Nut.
Jerky or
Fluttering
Spray
1. Loose or damaged Nozzle.
2. Paint level low.
3. Obstruction in Fluid Inlet.
4. Dry or loose Fluid
Needle Packing Nut.
1. Tighten or replace.
2. Refill paint Cup.
3. Backflush with solvent.
4. Lubricate or tighten
Packing Nut.
Follow all safety precautions whenever diagnosing or servicing the tool.
Disconnect air supply before service.
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