Graco 3A4803A Operation, Parts page 38

Troubleshooting
Spray Pattern Diagnostics
Problem
Spray pattern is uneven:
Spray pattern has tails:
Spray pattern has
dripping/sagging:
Spray pattern is too narrow:
38
Cause
Operator is moving too
fast while spraying.
Spray tip is clogged.
Material difficult to
atomize.
Outlet valves are dirty or
worn.
Pump has reached the
end of its life.
Speed control is set too
low.
Material may need to be
thinned.
Incorrect spray tip for
application of material.
Material not compatible
with sprayer.
Spray tip is worn or
damaged.
Operator is moving too
slowly while spraying.
Sprayer is too close to
target surface.
Holding trigger while
changing spray direction.
Speed control switch is set
too high.
Spray tip is worn or
damaged.
Sprayer is too close to
target surface.
Incorrect spray tip for
application of material.
Spray tip is worn or
damaged.
Solution
Slow speed of movement.
Unclog spray tip or clean spray
tip see Clear Tip Clog, page 17.
Increase speed until desired
pattern is achieved.
Hold sprayer farther away from
surface.
Switch to different spray tip. See
Tip and Pressure Selection,
page 15.
Remove two pump plugs and
front valve to gain access to the
three outlet valves, see
Cleaning Outlet Valves, page
29. Clean outlet valves.
Replace if necessary.
Replace pump assembly.
Increase speed until desired
pattern is achieved.
Thin material follow paint
manufacturer's
recommendations.
Install different size spray tip.
See Tip and Pressure
Selection, page 15.
Switch material.
Replace spray tip. See Spray
Tip Installation, page 24.
Move sprayer faster while
spraying.
Move sprayer away from
surface 10 in. (25 cm)
Release trigger when changing
directions.
Decrease speed until desired
pattern is achieved.
Replace spray tip. See Spray
Tip Installation, page 24.
Move sprayer away from
surface 10 in. (25 cm)
Install different size spray tip.
See Spray Tip Installation,
page 24.
Replace spray tip. See Spray
Tip Installation, page 24.
3A4803A