Graco WB100, Instructions-Parts List Manual

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Troubleshooting
Gun Gun Gun Operation Operation Operation Troubleshooting Troubleshooting Troubleshooting
Problem Problem Problem Cause Cause Cause Solution Solution Solution
Atomizing air pressure too high. Close restrictor valve part way, or
decrease air pressure as low as
possible; minimum 45 psi (0.32
MPa, 3.2 bar) needed at gun for
full voltage. Excessive spray fog.
Fluid too thin, or fluid flow is too
low. Increase viscosity or increase fluid
flow rate.
Atomizing air pressure too low. Open atomizing air valve more or
increase gun air inlet pressure;
use lowest air pressure necessary.
Poorly mixed or filtered fluid. Remix or refilter fluid.
“Orange Peel” finish.
Fluid too thick. Reduce viscosity.
Fluid leaks from the fluid packing
area. Worn packings or rod. Replace packings. See
Packing Rod Repair, page 63 .
Air leaks from the front of the gun. Air valve is not seating properly. Replace air valve. See
Air Valve Repair, page 72 .
Worn electrode. Replace electrode. See
Electrode Replacement, page 61 .
Worn fluid nozzle seat. Replace nozzle. See Air Cap and
Nozzle Replacement, page 59 .
Loose fluid nozzle. Tighten.
Fluid leakage from the front of the
gun.
Damaged nozzle o-ring. Replace o-ring. See Air Cap and
Nozzle Replacement, page 59 .
Low fluid supply. Add fluid if necessary.
Dirty or clogged fluid nozzle. Clean. See
Clean the Gun Daily, page 44 .
Gun does not spray.
Closed or damaged fluid
adjustment valve. Open valve, or see
ES On-Off and Fluid Adjustment
Valve Repair, page 71
.
Dirty air cap. Misaligned air cap and fluid nozzle. Clean fluid buildup off air cap
and fluid nozzle seat. See
Clean the Gun Daily, page 44 .
Poor grounding. See Grounding, page 22 . Excessive paint wrap back to
operator.
Incorrect distance from gun to part. Should be 8–12 in. (200–300 mm).
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