Craftsman 919.150020 - Manual (Page 7)

TROUBLESHOOTING GUIDE
PROBLEM CAUSE CORRECTION
Heavy top or bottom
pattern. ^ ^
Heavy right or left side
pattern. ^ ^
Material build-up on air cap or fluid
tip. Partially plugged horn holes,
center holes or fluid tip hole.
Determine where material build-up is by invert­
ing cap and test spraying. If pattern shape stays
in same position, the condition is caused by
material build-up on fluid tip. If pattern changes
with cap movement, the condition is in the air
cap.
Soak cap or tip in suitable solvent and wipe
clean. To clean orifices use a broom straw or
toothpick. Never use a wire or hard instrument.
This damages holes and distorts its spray pat­
tern.
Heavy center pattern. A Too much material Reduce fluid flow or increase air pressure.
f
Material too thick. Thin material.
Split spray pattern. ^ Not enough material. Reduce air pressure or increase fluid flow.
Jerky or fluttering spray. Insufficient material. Fill material container.
Gun with cup tipped at excessive
angle. Do not tip excessively or rotate fluid tube.
Obstructed fluid passage or hose.
Loose fluid tip. (Most common
cause.)
Clean.
Tighten to stop leak.
Loose or cracked fluid tube in cup
or pressure tank.
Tighten or replace.
Dry or worn packing or loose pack­
ing nut.
Lubricate or replace. Tighten.
Improper spray pattern. Gun improperly adjusted. Readjust gun following instructions carefully.
Dirty air cap. Clean air cap.
Fluid tip obstructed. Clean.
Sluggish needle. Lubricate.
Unable to get round spray. Fan adjustment stem not seating
properly.
Clean or replace.
Will not spray. No air pressure at gun. Check air lines.
Needle adjusting screw not open
enough.
Open needle adjusting screw.
Fluid leakage from packing
retainer nut.
Packing nut loose.
Packing worn or dry.
Tighten, but not so tight as to grip needle.
Replace packing or lubricate. See "Maintenance".