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SB-2-628-K PAGE 7
Will not spray No pressure to gun. Check air and material lines.
Piston stops moving. Check tightness of socket screws (7).
New air packing (20) Remove fluid needle (28) and lubricate
with petroleum jelly and reassemble.
Improper spray pattern A. Gun not adjusted properly. A. Re-adjust. See “Operation Section”.
A, & Material build up on the air A, & Clean the air cap or fluid tip (nozzle). See
B. cap or fluid tip. B. “Preventive Maintenance”.
C. Wrong material or material too C. Adjust material pressure or thin material.
thick.
D. Insufficient material or atomizing D. Increase material or reduce atomizing
air pressure too high. air pressure.
Jerky or fluttering spray Insufficient material in the Fill tank or clear obstruction.
tank or an obstruction in the line.
Gun material passage plugged. Clean.
Worn packings (11). Replace.
Loose or damaged fluid tip. Tighten or replace.
Fluid leaking from needle Needle packings (11) worn. Replace.
packings (11).
Rough or worn fluid needle shaft. Polish contact point where packings (11)
makes contact with very fine emery cloth
or replace tip (3) & needle (28).
Dripping from fluid tip. Contamination (i.e. dried paint) Clean.
in seating area of tip (3).
Worn or damaged fluid tip (3) Replace.
or needle (28).
Piston springs (30) and/or (31) Replace.
damaged or deformed.
Air Leakage from Control Worn Seals. Replace Valve. (23).
Valve (23)
PROBLEM CAUSE CORRECTION
TROUBLESHOOTING
Proper gun adjustment will result in normal spray patterns, from
round with the fan control valve (23) closed, to long and narrow
with the valve open. Pattern width depends upon how much the
valve is opened, the type of air cap used and fluid flow rate.
NORMAL SPRAY PATTERN
The proper combination of fluid pressure, fan and
atomization air pressure, and fluid tip size should
result in a pattern of this shape.
Note
To determine where the material build up is, rotate the air cap 180° and test spray. If the pattern stays
in the same position, the condition is caused by material build up on the fluid tip (nozzle). If the pattern
changes with air cap movement, the build up is in the air cap.
CDB
A
TROUBLESHOOTING CHART