Table 4-3. Troubleshooting Chart (Continued)
TEST OR INSPECTION
10. NOZZLE PRESSURE GREATER THAN 100 PSI
Step 1. Check nozzle assembly for plugging.
Figure 4-73. Nozzle Assembly
DO NOT use hard metal objects to unplug the air cap. This will damage the air cap. Use a soft
material, like a toothpick.
Figure 4-74. Air Cap
a. Unscrew knurled ring and remove air cap.
If the air cap holes are partially plugged or coated with oil residue, soak the air cap in
acetone (O-A-51F) to clean it.
Carefully clean out the air cap holes with a toothpick or other soft non-metallic object.
Wipe the air cap, the exposed fluid nozzle surfaces, and fluid hole projection with a clean