Graco 17M359 Operation And Parts Manual page 35

Spray Pattern Diagnostics
Problem
Spray pattern is uneven:
Spray pattern has tails:
Spray pattern has
dripping/sagging:
Spray pattern is too narrow:
3A4433B
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 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.
Troubleshooting
Solution
Slow speed of movement.
Unclog spray tip or clean spray
tip see Clear Tip Clog, page 16.
Increase speed control until
desired pattern is achieved.
Hold sprayer farther away from
surface.
Switch to different spray tip. See
Tip and Pressure Selection,
page 14.
Remove two pump plugs and
front valve to gain access to the
three outlet valves. Clean outlet
valves. Outlet valves are not
installed properly. See Cleaning
Outlet Valves, page 28.
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 14.
Switch material.
Replace spray tip. See Spray
Tip Installation, page 23.
Move sprayer faster while
spraying.
Move sprayer away from
surface 12 in. (30 cm)
Release trigger when changing
directions.
Decrease speed until desired
pattern is achieved.
Replace spray tip. See Spray
Tip Installation, page 23.
Move sprayer away from
surface 12 in. (30 cm)
Install different size spray tip.
See Tip and Pressure
Selection, page 14.
Replace spray tip. See Spray
Tip Installation, page 23.
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