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A-D2U & A-D2UAD
Automatic Spray Gun
OPERATING INSTRUCTIONS & REPLACEMENT PARTS
INSTRUCTIONS AND PARTS LIST A-D2U-8/31/2011
Supersedes Instructions & Parts List A-D2U-4/27/2010
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 .
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.
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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SPRAY HEAD COMPONENTS
Spray Heads for A-D2U Automatic Spray Guns are available in several different styles, some of which are available with
Stainless Steel components. The C.F.M. requirements range from 4 to 18 C.F.M. @ 50 to 60 lbs. air pressure. NOTE: When
either fluid Tip or fluid Needle is worn and requires replacement, it is recommended that both items be changed for best results.
All Tips and Needles are made using 303 Stainless Steel. Extensions require material pressure feed.
EXTERNAL FAN PATTERN
• Application: Broad coverage/High Production.
• Size: 8-16
• Fluid Viscosity: Light to Heavy (9 to 16 C.F.M. @ 60 P.S.I.)
1. 56DFA- Aircap Body (Select Size above)
2. U-2639S Sleeve & Spring
3. U-1649 Aircap Nut
4. D2- Stainless Tip (Select Size 8)
5. A-DU-4 Stainless Needle
6. D2RE-8 or 10 Tip (with Needle Seat in rear of Tip)
7. A-DU-3-1/4 Needle (for Needle Seat in rear of Tip)
INTERNAL ROUND PATTERN
• Application: Heavy enamels, lacquers etc. at high production.
• Size: 8-8
• Fluid Viscosity: Light to Medium (4 to 8 C.F.M. @ 50 P.S.I.)
1. DR-15- Aircap Body (Select Size above)
2. U-1649 Aircap Nut
3. D2- Stainless Tip (Select Size 8)
4. A-DU-4 Stainless Needle
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11. D2U-7B Fluid Body
U-2072 Fan Control Assembly
13. AE-43 “O” Ring (1)
15. U-2065 Fan Control Screw
U-3504 Leather Packing Set
17. DU-28-12 Packing Washers (12)
18. DU-29 Packing Gland (1)
19. DU-30 St. St. Spring (1)
20. U-27 Packing Gland (1)
24. U-322 Cup Leather (1)
A-D2U Automatic Spray Gun
DU-1914B Cylinder Assembly
6. A-DU-4 Needle
20. U-27 Packing Gland †
17. DU-28-12 Packing Washers (3) †
21. DU-1907B Shell Assembly
9. U-3633 Large “O” Ring
10. U-3632 Small “O” Ring
27. U-2966 Piston Spring
DU-873E Piston Assembly
22. DU-2965 Needle Chuck
23. U-2964 Inner Bushing
24. U-322 Cup Leather †
25. U-2465A Outer Disc
26. U-2544 Locknut
U-2686A Cylinder Cap Assembly
28. U-2707A Cylinder Cap
29. U-941 Spring Washer
30. U-951B Fluid Dial
31. U-2675A Friction Nut
32. U-1098 St. St. Spring
33. U-2584P Washer
34. 59-57 Lock Stud
35. U-3178 Fluid Adj. Knob ††
36. 59-56 Lock Screw
D-338 PTFE Packing Set
37. U-339 PTFE ‘O” Rings (2)
38. D-300 PTFE Packings (2)
39. D-302 PTFE Packings (2)
40. D-301 Packing Expander (2)
19. DU-30 St. St. Spring (1)
AD-2 Air Dial Assembly
54. U-3255 Use N-1/4 & U-3321 Tube Assembly
55. U-3256 Packing Nut
56. U-3257 PTFE Packing
57. U-3258 Air Valve Body
58. U-2734A Packing Housing
59. DU-28-12 Packing Washers (1) †
60. U-27 Packing Gland
61. U-1702 Valve Spring
62. U-48 Strainer Nut
63. U-941 Spring Washer
64. PA-14A Dial
65. U-2675A Friction Nut
66. U-1098 Spring St. St.
67. U-959 Adjusting Needle Valve
69. U-3548 Packing Washer
†† WARNING: Do not use as a shut-off by turning all the
way down--it will split the tip.
† This item included in U-3502 Packing Set.
U-28-12 & DU-28-12 sold by the dozen only.
59-69 PTFE Piston Assembly
22. DU-2965 Needle Chuck
26. U-2544 Locknut
41. 59-63 Piston (Aluminum)
42. 59-64 Piston Rings PTFE (2)
43. 59-65 Expansion Spring (2)
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FLUID BODIES, EXTENSIONS, NEEDLES, AND ACCESSORIES
D2U- Fluid Bodies
1. D2U-7B Standard
2. D2UA-7B Separate Atomizing
† DU-28-12 Packing Washers sold by dozen only.
PTFE Needle Packings and Piston Rings are available
Teflon Needle Packings only add X after A
Teflon Needle Packings & Piston add XX after A
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