Spray Pattern Troubleshooting Chart - Graco 218-026 Instructions-Parts List Manual

SPRAY PATTERN TROUBLESHOOTING CHART

Installing and servicing this equipment requires access to parts which may cause electric shock or other serious
bodily injury if the work is not performed properly. Do not install or service this equipment unless you are trained and
qualified.
To reduce the risk of serious bodily injury, including splashing fluid or solvent in the eyes or on the skin, always
follow the Pressure Relief Procedure Warning on page 9 before checking, adjusting, cleaning or repairing the
gun or any part of the system. Disconnect the fluid hose from the gun.
NOTE: Check all possible remedies in the Troubleshooting Charts before disassembling the gun.
PROBLEM:
IMPROPER SPRAY
PATTERN
Fluttering or spitting
spray
Streaks
NOTE: Some improper patterns are caused by the improper balance between air and fluid.
WARNING
CAUSE
Insufficient fluid supply.
Loose fluid nozzle or damaged fluid
nozzle taper seat.
Dirt between fluid nozzle, taper seat
and body.
Loose or cracked coupler at fluid inlet.
Loose fluid tube in cup or tank.
Fluid build–up on air cap; partially
clogged horn holes. Full air pressure
from clean horn hole forces fan pattern
toward clogged end.
Damaged fluid nozzle or air cap holes.
Fluid build–up on the perimeter of fluid
nozzle orifice, or partially clogged fluid
nozzle orifice.
Too high atomization air pressure.
Fluid too thin.
Not enough fluid pressure.
Low atomization air pressure.
Fluid too thick.
Too much fluid.
Last coat of fluid applied too wet.
Too much air pressure.
Insufficient air pressure.
Non–uniform spray pattern.
SOLUTION
Adjust fluid regulator or fill fluid tank.
Tighten or replace fluid nozzle
See page 10.
Clean. See page 11.
Tighten or repair.
Tighten.
Clean with soft implement or
submerge in suitable solvent and wipe
clean. See page 11.
Replace damaged part. See page 10.
Remove obstruction. Never use wire
or hard instruments. See page 11.
Reduce air pressure or adjust air
adjusting valve.
Regulate fluid viscosity.
Increase fluid pressure.
Increase air pressure.
Regulate fluid viscosity.
Reduce fluid flow. Reduce fluid
pressure on pressure feed guns and/
or adjust fluid adjusting screw until
proper pattern is obtained.
Apply drier finish with multiple
strokes.
Use least air pressure necessary.
Increase air pressure.
Clean or replace air cap.
See page 11.