MasterCraft 058-9312-8

TROUBLESHOOTING
21
AIR-POWERED GRAVITY-FEED SPRAY GUN 058-9312-8
Pattern is not spread
uniformly
1. Paint has built up on air cap.
2. Fluid nozzle is dirty or worn.
1. Clean or replace air cap.
2. Clean or replace fluid nozzle.
Centre of pattern is
too narrow
1. Paint is too thin or insufficient
quantity.
2. Atomization air pressure is too high.
1. Regulate paint viscosity.
2. Reduce air pressure.
Width of spray
pattern is too narrow
1. Paint is too thick.
2. Atomization air pressure is too low.
1. Regulate paint viscosity.
2. Increase air pressure.
Air leakage from air
cap when trigger is
not pressed
1. Air valve stem is stuck.
2. Air valve or seat is contaminated.
3. Air valve or seat is worn or damaged.
4. Air valve spring is broken.
5. Valve stem is bent.
1. Lubricate the air valve stem.
2. Clean the air valve or seat.
3. Replace the air valve or seat.
4. Replace the air valve spring.
5. Replace the valve stem.
Fluid leakage from
packing nut
1. Packing nut is loose.
2. Packing nut is worn or dry.
1. Tighten, but do not restrict the needle
movement.
2. Replace or lubricate (non-silicone oil).
Excessive overspray
1. Atomization pressure is too high.
2. Work surface is too far.
3. Improper stroking (arcing, gun motion
are too fast).
1. Reduce the air pressure.
2. Adjust to proper distance.
3. Move at moderate pace, parallel to work
surface.
PROBLEM POSSIBLE CAUSES SOLUTIONS
MC-OM-10
MC-OM-11
MC-OM-12