INSTRUCTIONS AND PARTS LIST A-D2U-8/31/2011
Supersedes Instructions & Parts List A-D2U-4/27/2010
A-D2U & A-D2UAD
Automatic Spray Gun
OPERATING INSTRUCTIONS & REPLACEMENT PARTS
DESCRIPTION: The A-D2U Automatic Spray Gun, is a heavy
and more viscous duty air actuated production Spray Gun, that
will cover a range of materials to include heavy enamels and
lacquers, abrasives or pigmented materials. See page 2 for Spray
Head Components used for spraying buffing and deadener
compounds, glass beads, insulation and waterproofing materials.
Extensions require material pressure feed.
CONNECTIONS: Spray Guns have the following: Air inlet
1/4"N.P.T (F) and Fluid inlet 3/8" N.P.T. (M).
PACKING WASHERS: Packings are available in oil treated Leather
or PTFE for natural lubricity and higher temperatures. See Page 3.
OPERATION:
1. Mount Spray Gun in desired position.
2. Blow out all hoses (airlines) before connecting to Spray Gun
to remove foreign particles.
3. Connect hose from air supply to air inlet fitting.
4. Connect fluid supply to fluid inlet.
5. Tighten all hose connections securely.
6. Adjust air pressure to desired amount at the Air Regulator.
7. Adjust Fluid volume by turning the U-3178 Fluid Adjusting
Knob to the left or right. Note: Do not use as shutoff by
turning all the way down, it may split the tip.
8. Adjust to proper fan pattern by turning the U-2065 Fan
Control Screw to left or right. For AD-2 Air Dial Assembly
adjustment, turn U-959B Adjusting Needle Valve left or right.
TIP REPLACEMENT:
1. Turn off Air and Fluid Pressure.
2. Release Fluid Needle (A-DU-4") pressure from seat of Tip by
taking off the U-2686A Cylinder Cap Assembly.
3. Loosen U-1649 Aircap Nut and remove Spray Head
Assembly. Leave Needle in place.
4. Unscrew D2-Tip. Place new D2-Tip in position.
5. To reassemble reverse above procedure.
MAINTENANCE: Requirements of the A-D2U- Automatic Spray
Guns have been reduced to a minimum. The leather packing
washers should be lubricated with light oil or replaced once a month.
Old packing washers cause leakage of air and Fluid. PTFE
Packings are self-lubricating.
CLEANING: After each use, flush clean solvent through the fluid
passages of the Spray Gun and Wipe off the outside with clean
solvent. Never leave the entire Spray Gun immersed in solvent.
Dirty Aircaps and Tips should be cleaned by soaking in solvent and
blown clean with air.
TROUBLE SHOOTING SPRAY PATTERNS:
(A) A ROUGH OR STIPPLED FINISH is caused by low or
restricted flow of air pressure or too heavy materials being
applied with gun too close to surface.
(B) A WET OR SAGGING FINISH is due to low air pressure or
restricted flow of air, material being too thin, or applied too close
to the surface.
(C) A SPUTTERING SPRAY is caused by air leaking into fluid line
or can be caused by a loose fluid tip, a broken or split tip, lumpy
material, a clogged vent hole in cover of material cup, or air leak
at fluid pipe attached to inside of tank cover, or a clogged paint
strainer. Sputtering may also be caused by worn packing
washers, or worn or scored needle.
TO CORRECT: Tighten tip securely or replace. Strain
material and clean strainer. Tighten fluid pipe in tank or
replace packings and needle in Spray Gun.
(D) AN ARCHED FAN SPRAY PATTERN is caused by dried
material accumulated in one fan port of the fan aircap, distorting
the pattern.
TO CORRECT: Dissolve material inside fan port with
suitable solvent applied with a small brush.
NOTE: Never use wire or sharp instruments to clean
Fan Ports as permanent damage to the fan ports will
result in destroying uniformity of the Fan Pattern.
(E) UNBALANCED FAN SPRAY PATTERN, heavy on one side,
may be caused by material collecting around outside of the fluid
tip and aircap, or by a loose aircap.
TO CORRECT: Remove aircap and clean fluid tip and
aircap with solvent then dry with air. Always be sure fan
aircap and aircap body are tightened securely.
(F) A HEAVY CENTER in a fan pattern is caused by insufficient air
pressure at the fan port. Rough or shady edges are also
caused by low air pressure.
TO CORRECT: Increase air line pressure.
(G) A SPLIT FAN SPRAY PATTERN, heavy on each end and light
in the center, is caused by excessive air pressure.
TO CORRECT: Reduce air pressure.
WARNING: Spray materials may be harmful if inhaled or
allowed to come into contact with the skin or eyes.
Consult the product label and Material Safety Data Sheet
supplied for the spray material. Follow all safety
precautions. CAUTION: Well Ventilated Area Required
to remove fumes, dust or overspray. Secure air hose and
fluid hose wrench tight for safety and to prevent leaks.
M a x i m u m A i r P r e s s u r e 1 0 0 P . S . I .
M a x i m u m F l u i d P r e s s u r e 4 5 P. S . I .
Paasche Airbrush Company
4311 North Normandy Avenue
Chicago, IL 60634-1395
Phone: 773-867-9191 • Fax: 773-867-9198
Website: paascheairbrush.com
E-Mail: info@paascheairbrush.com
Printed in the U.S.A.
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