Paasche A-JU Owner's Manual
The Paasche A-JU Automatic Spray Gun is a light-duty air-actuated production spray gun designed for various materials. It features PTFE packings and a stainless steel tip and needle for durable and reliable performance. This gun can handle light lacquers, latex, acid, and corrosives while providing adjustable air pressure and fluid volume control for precise application. The gun requires an air and fluid hose connection and is designed for mounting in a desired position.
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DESCRIPTION:
The A-JU Automatic Spray Gun, is a light duty air actuated
production spray gun. It will cover a range of materials to include
light lacquers, latex, acid or corrosives. When using Extensions,
material must be pressure fed for proper application.
Features:
Connections: Air Inlet 1/4” NPT(M) and Fluid Inlet 1/4” NPT(M).
Dimensions: 5-1/8” (L) x 2-1/4” (D).
Packings and piston are PTFE.
All Tips and Needles are made using 303 Stainless Steel.
Spray Heads for the A-JU 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 .25 to 3 CFM @ 30 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.
OPERATION:
1. Mount Gun in desired position. Can use UM-96 mounting
2. Before installing, blow out air hoses with compressed air to
remove foreign particles.
3. Connect hose from air supply to air inlet fitting.
4. Connect fluid hose to fluid inlet supply.
5. Tighten all hose connections securely.
6. Adjust air pressure to 45-55 P.S.I. at the Air Regulator.
7. Adjust fluid volume by turning the #13 Fluid Adjusting Knob
to the left or right.
NOTE: DO NOT USE #13 AS A SHUT-OFF BY TURNING ALL
THE WAY DOWN - IT MAY SPLIT THE TIP.
TIP REMOVAL:
1. Turn off Air and Fluid Pressure.
2. Release Needle pressure from the seat of Tip, by backing
off the #13 Fluid Adjusting Knob approximately 5 turns, then
removing #11 Rear Cap Assembly.
3. Loosen AU-12 Aircap Nut and remove Spray Head
Assembly. Leave Needle In Place.
4. Unscrew AU-Tip. Place New AU-Tip in position.
5. To replace, reverse above procedure.
A-JU
Automatic Spray Gun
OPERATING INSTRUCTIONS AND REPLACEMENT PARTS
INSTRUCTIONS & PARTS LIST A-JU 2/27/2023
Paasche Airbrush Company
9511 58th Place
Kenosha, WI 3144
Phone: (800)621-1907
Website: paascheairbrush.com
E-Mail: [email protected]
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 airhose 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 .
MAINTENANCE:
Requirements of the A-JU Automatic Spray Gun have been
reduced to a minimum. (Old Packing Washers cause leakage of
Air or Fluid and replacement should be made). PTFE Packings
are self-lubricating. 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.
CLEANING:
TROUBLE SHOOTING SPRAY PATTERNS:
(A) A ROUGH OR STIPPLE FINISH is due to low or restricted flow of air
pressure or too heavy materials being applied with spray 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, 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, air leak at fluid pipe
attached to inside of tank cover, or a clogged paint strainer.
TO CORRECT: Tighten tip securely or replace. Strain materials
and clean strainer. Sputtering might also be caused by worn packing
washers, or worn or scored needle.
(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 air 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, dry with air pressure. Always be sure fan aircap and aircap
body is 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.
The A-JU Automatic Spray Gun, is a light duty air actuated
production spray gun. It will cover a range of materials to include
light lacquers, latex, acid or corrosives. When using Extensions,
material must be pressure fed for proper application.
Features:
Connections: Air Inlet 1/4” NPT(M) and Fluid Inlet 1/4” NPT(M).
Dimensions: 5-1/8” (L) x 2-1/4” (D).
Packings and piston are PTFE.
All Tips and Needles are made using 303 Stainless Steel.
Spray Heads for the A-JU 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 .25 to 3 CFM @ 30 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.
OPERATION:
1. Mount Gun in desired position. Can use UM-96 mounting
2. Before installing, blow out air hoses with compressed air to
remove foreign particles.
3. Connect hose from air supply to air inlet fitting.
4. Connect fluid hose to fluid inlet supply.
5. Tighten all hose connections securely.
6. Adjust air pressure to 45-55 P.S.I. at the Air Regulator.
7. Adjust fluid volume by turning the #13 Fluid Adjusting Knob
to the left or right.
NOTE: DO NOT USE #13 AS A SHUT-OFF BY TURNING ALL
THE WAY DOWN - IT MAY SPLIT THE TIP.
TIP REMOVAL:
1. Turn off Air and Fluid Pressure.
2. Release Needle pressure from the seat of Tip, by backing
off the #13 Fluid Adjusting Knob approximately 5 turns, then
removing #11 Rear Cap Assembly.
3. Loosen AU-12 Aircap Nut and remove Spray Head
Assembly. Leave Needle In Place.
4. Unscrew AU-Tip. Place New AU-Tip in position.
5. To replace, reverse above procedure.
A-JU
Automatic Spray Gun
OPERATING INSTRUCTIONS AND REPLACEMENT PARTS
INSTRUCTIONS & PARTS LIST A-JU 2/27/2023
Paasche Airbrush Company
9511 58th Place
Kenosha, WI 3144
Phone: (800)621-1907
Website: paascheairbrush.com
E-Mail: [email protected]
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 airhose 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 .
MAINTENANCE:
Requirements of the A-JU Automatic Spray Gun have been
reduced to a minimum. (Old Packing Washers cause leakage of
Air or Fluid and replacement should be made). PTFE Packings
are self-lubricating. 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.
CLEANING:
TROUBLE SHOOTING SPRAY PATTERNS:
(A) A ROUGH OR STIPPLE FINISH is due to low or restricted flow of air
pressure or too heavy materials being applied with spray 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, 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, air leak at fluid pipe
attached to inside of tank cover, or a clogged paint strainer.
TO CORRECT: Tighten tip securely or replace. Strain materials
and clean strainer. Sputtering might also be caused by worn packing
washers, or worn or scored needle.
(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 air 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, dry with air pressure. Always be sure fan aircap and aircap
body is 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 A-JU Automatic Spray Gun
1. AR-15- Round Aircap (Select Size000/0, 1, 2 or 3)
ASR-15- Stainless Rd Aircap (Select Size 000/0, 1 or 3)
1a. ANFA- Fan Aircap (Select Size 000/0, 1, 2 or 3)
2. AU-12 Aircap Nut
3. AU- Stainless Tip (Select Size 000, 0, 1, 2 or 3)
4. A-AU-2-29/32 Needle
5. AU-8B
6. U-3632
7. U-3633
8. U-3045
9. U-3664
10. U-2502
11. U-3669
12. U-1853
13. U-3670
14. U-3687
Fluid Body
Small O-ring
Large O-ring
Cylinder Shell
PTFE Piston Assembly Piston
Spring (New 2024)
Rear Cap
Spring
Needle Stop Adjustment Knob
Packing Set
No. Part No. Description
Size References: Tip and Aircap must match size
000 .014
0 .021
1 .028
2 .040
3 .046
U-3503 (Old Style) Leather Packing Set
Do Not Use as a Shutoff by turning all the way Down, It will split the Tip.
Page 2
OPTIONAL ITEMS:
E. PT-64 2 QT Paint Cup W/ Regulator
F. HA-1/4-10 Fluid Hose W/HAC-1/4 Couplings
G. HL-3/16-10 10 FT Air Hose W/ 1/4 NPT Couplings
A. UM-96 Mounting Assembly
B. 27SC 3 oz. Gravity Cup
C. 28SC 8 oz. Gravity Cup
A B C
E F G
1 2
6 7
8
9
3
4 5 12 1311
10
14
All Cylinder Shells Marked
1018 or Newer will have
Teflon Packing Installed.
1a
No. Part No. Description
*(PACKING ASSEMBLY ORDER) NYLON / STAINLESS / NYLON
*
1. AR-15- Round Aircap (Select Size000/0, 1, 2 or 3)
ASR-15- Stainless Rd Aircap (Select Size 000/0, 1 or 3)
1a. ANFA- Fan Aircap (Select Size 000/0, 1, 2 or 3)
2. AU-12 Aircap Nut
3. AU- Stainless Tip (Select Size 000, 0, 1, 2 or 3)
4. A-AU-2-29/32 Needle
5. AU-8B
6. U-3632
7. U-3633
8. U-3045
9. U-3664
10. U-2502
11. U-3669
12. U-1853
13. U-3670
14. U-3687
Fluid Body
Small O-ring
Large O-ring
Cylinder Shell
PTFE Piston Assembly Piston
Spring (New 2024)
Rear Cap
Spring
Needle Stop Adjustment Knob
Packing Set
No. Part No. Description
Size References: Tip and Aircap must match size
000 .014
0 .021
1 .028
2 .040
3 .046
U-3503 (Old Style) Leather Packing Set
Do Not Use as a Shutoff by turning all the way Down, It will split the Tip.
Page 2
OPTIONAL ITEMS:
E. PT-64 2 QT Paint Cup W/ Regulator
F. HA-1/4-10 Fluid Hose W/HAC-1/4 Couplings
G. HL-3/16-10 10 FT Air Hose W/ 1/4 NPT Couplings
A. UM-96 Mounting Assembly
B. 27SC 3 oz. Gravity Cup
C. 28SC 8 oz. Gravity Cup
A B C
E F G
1 2
6 7
8
9
3
4 5 12 1311
10
14
All Cylinder Shells Marked
1018 or Newer will have
Teflon Packing Installed.
1a
No. Part No. Description
*(PACKING ASSEMBLY ORDER) NYLON / STAINLESS / NYLON
*
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Key Features
- Air actuation
- Light duty production gun
- PTFE packings
- Stainless steel tip and needle
- Adjustable air pressure
- Adjustable fluid volume
- Multiple spray patterns
- Mountable
- Lightweight
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Frequently Answers and Questions
What materials can the A-JU Automatic Spray Gun handle?
The A-JU Automatic Spray Gun can handle light lacquers, latex, acid, and corrosives.
How do I adjust the air pressure on the A-JU Automatic Spray Gun?
You can adjust the air pressure to 45-55 P.S.I. at the Air Regulator.
How do I adjust the fluid volume on the A-JU Automatic Spray Gun?
Turn the #13 Fluid Adjusting Knob to the left or right to adjust the fluid volume.
What should I do if I notice a sputtering spray?
A sputtering spray can be caused by air leaking into the fluid line, a loose fluid tip, a broken or split tip, lumpy material, a clogged vent hole in the cover of the material cup, an air leak at the fluid pipe attached to the inside of the tank cover, or a clogged paint strainer. To correct this, tighten the tip securely, replace the tip, strain materials, and clean the strainer.
How do I remove the tip from the A-JU Automatic Spray Gun?
Turn off the air and fluid pressure, release needle pressure by backing off the #13 Fluid Adjusting Knob approximately 5 turns, remove the #11 Rear Cap Assembly, loosen the AU-12 Aircap Nut, remove the Spray Head Assembly, and unscrew the AU-Tip.
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