TM 5-4940-228-14
Table 3-2. Operator Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. Air leakage from spray gun nozzle.
Step 1.
Check air valve seating by snapping trigger several times.
Remove air valve. Clean or replace air valve as
necessary.
6. Cresent shaped spray pattern.
Step 1.
Check for loose air nozzle.
Tighten.
Step 2.
Check for dried paint build up on outside of fluid nozzle.
Clean off fluid tip with rag wet with paint thinner.
7. Heavy spray at top or bottom.
Step 1.
Check air nozzle side port holes for dried material
r e s t r i c t i n g f l o w.
Dissolve material in side ports with paint thinner.
8. A split spray or one that is heavy on each end and weak in middle.
Step 1.
Check atomizing pressure.
Reduce air pressure.
Step 2.
Check for too wide a spray pattern with thin material.
Open fluid control needle, at the same time, turn
fan control in.
9. Intermittent spray.
Step 1. Check
Step 2. Check
Step 3. Check
Step 4. Check
Step 5. Check
paint supply in tank or cup.
Fill container with paint.
for obstructed fluid passage or hose.
Clean with paint thinner.
cup for looseness or damage.
Tighten or replace.
for loose or damaged fluid tip.
Tighten or replace.
for loose or damaged packing.
Tighten packing nut or replace packing.
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