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INSTRUCTIONS-PARTS LIST
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
HIGH PRESSURE AIR-ASSISTED
Model AA Plus
4000 psi (28 MPa, 280 bar) Maximum Working Fluid Pressure
100 psi (0.7 MPa, 7 bar) Maximum Working Air Pressure
Part No. 238–402, Series A
Spray Gun with standard spray tip, tip guard, air cap,
and 1/4–18 npsm (R1/4–19) air line fitting.
Part No. 238–851, Series B
Spray Gun with AA Reverse-A-Clean (RAC) assem-
bly and 1/4–18 npsm (R1/4–19) air line fitting.
Part No. 238–852, Series A
Spray Gun with standard spray tip, tip guard, air cap,
and quick-disconnect air line fitting.
Part No. 238–883, Series A
Hi-Flow Spray Gun with Hi-Flow fluid needle and dif-
fuser-seat, and standard spray tip, tip guard, air cap,
and 1/4–18 npsm (R1/4–19) air line fitting.
Part No. 239–001, Series B
Hi-Flow Spray Gun with Hi-Flow fluid needle and dif-
fuser-seat, AA Reverse-A-Clean (RAC) assembly, and
1/4–18 npsm (R1/4–19) air line fitting.
U.S. Patent Nos. 3,843,052; 4,386,739; 5,285,965
United Kingdom Patent No. 2 111 406 B
Patented 1984 Canada
Brevete 1984
French Patent No. 82–21202
Patents Pending
Foreign Patents Pending
Warnings
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Installation
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Operation
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Spray Pattern Troubleshooting
Service
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Parts
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Spray Tip Selection Chart
GRACO INC. P.O. BOX 1441
Table of Contents
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13
14
16
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20
Graco Inc. is registered to I.S. EN ISO 9001
First choice when
quality counts.
Spray Gun
2
Air Caps
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4
Dimensions
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7
Technical Data
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Accessories
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Warranty
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Graco Phone Number
MINNEAPOLIS, MN 55440–1441
308–640
Supersedes F
Part No. 238–402 Spray Gun shown
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Rev. G
05985
20
24
24
25
28
28
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Summary of Contents for Graco AA Plus 238-402
- Page 1 Spray Tip Selection Chart ..... . GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 Graco Inc. is registered to I.S. EN ISO 9001...
- Page 2 WARNING INJECTION HAZARD Spray from the gun, hose leaks, or ruptured components can inject fluid into your body and cause an extremely serious injury, including the need for amputation. Splashing fluid in the eyes or on the skin can also cause a serious injury. Fluid injected into the skin might look like just a cut, but it is a serious injury.
- Page 3 This equipment is for professional use only. Read all instruction manuals, tags, and labels before operating the equipment. Use the equipment only for its intended purpose. If you are uncertain about usage, call your Graco distributor. Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
- Page 4 It is not an actual system design. Contact TOXIC FLUID HAZARD your Graco distributor for assistance in designing a To prevent hazardous concentrations of system to meet your needs. toxic and/or flammable vapors, spray only in a properly ventilated spray booth.
- Page 5 Installation Connect the Air Line Connect the Fluid Line 1. Install an air line filter (A) to ensure a clean, dry air WARNING supply to the gun. Dirt and moisture in the line can ruin the appearance of your finished piece. See Fig.
- Page 6 Installation Ground the System 3. Air , fluid, and hydraulic hoses connected to the pump : Use only grounded hoses with a maxi- mum of 500 feet (150 m) combined hose length to WARNING ensure grounding continuity. Check the electrical resistance of your air and fluid hoses at least once FIRE AND EXPLOSION HAZARD a week.
- Page 7 Additional cards are available at no charge 9. If you suspect that the spray tip or hose is com- from Graco. pletely clogged or that pressure has not been fully relieved after following the steps above , v ery...
- Page 8 Operation How the Air-Assisted Spray Gun Operates Install a Spray Tip WARNING The air-assisted spray gun combines airless and air spraying concepts. The spray tip shapes the fluid into a fan pattern, as does a conventional airless spray tip. INJECTION HAZARD Air from the air cap further atomizes the fluid and To reduce the risk of a fluid injection completes the atomization of the paint tails into the...
- Page 9 Operation Adjust the Spray Pattern For a narrower pattern, turn the pattern adjustment valve knob clockwise. If the pattern is still not narrow enough, increase the air pressure to the WARNING gun slightly or use a different size tip. RECOIL HAZARD NOTE: Due to the very high pressure fluid Pattern adjustment is not available with guns...
- Page 10 Operation Apply the Fluid When applying the fluid, keep the gun a consistent distance, about 8 to 12 inches (200 to 300 mm) from the surface of the object being sprayed. Always hold the gun at a right angle from the surface. Do not make an arc with the gun as it causes an uneven coat of fluid.
- Page 11 Operation Clean the Spray Gun and System Daily 4. If using an in-line filter, remove and clean it thoroughly in a compatible solvent. WARNING 5. Clean the system’s fluid filter and air line filter. INJECTION HAZARD Check the Diffuser-seat Operation Weekly To reduce the risk of an injection injury or splashing fluid in the eyes or on the WARNING...
- Page 12 Operation Flush the Gun Daily 1. Relieve the pressure as instructed on page 7. 2. Disconnect the atomizing air hose and the fluid WARNING supply line. INJECTION HAZARD 3. Remove the tip guard or AA RAC assembly (11), To reduce the risk of a fluid injection air cap or RAC housing (13), and spray tip (14).
- Page 13 Troubleshooting NOTE: WARNING Check all possible remedies in the troubleshooting charts before disassembling the gun. INJECTION HAZARD Some improper patterns are caused by the To reduce the risk of a fluid injection improper balance between air and fluid. injury, follow the Pressure Relief Proce- dure on page 7 before checking or servicing any of the system equipment and when- ever you are instructed to relieve pressure.
- Page 14 Service Fluid Needle Cartridge Service WARNING Follow the procedure below to remove the fluid needle cartridge for cleaning or for replacement. INJECTION HAZARD To reduce the risk of a fluid injection 1. Relieve the pressure as instructed on page 7. injury, follow the Pressure Relief Proce- dure on page 7 before checking or 2.
- Page 15 Service Part No. 238–402 Spray Gun shown SERVICE NOTES: FLUID Gasket (18) must be replaced if diffuser-seat (15) is removed U-cup lips face inward or replaced to avoid fluid leakage Torque to 23–27 ft-lb (31–37 N m) Gasket (17) must be replaced if fluid connector (30) is removed or replaced to avoid fluid leakage Torque to 20–24 ft-lb (27–32 N m) Lubricate threads...
- Page 16 Parts Part No. 238–402, 238–852, and 238–883 SERVICE NOTES (See Fig. 8 for additional information): 05990A Lubricate threads Gasket (17) must be replaced if fluid connector (30) is removed or replaced to avoid fluid leakage. Torque to 23–27 ft-lb (31–37 N m) Included with Gun 238–402 and 238–883 only.
- Page 17 Parts Use Only Genuine Graco Parts and Accessories Part No. 238–402, 238–852, and 238–883 Repair Kits Ref. Kit No. and Kit No. and Includes: Part No. Description Qty. Description i ti Ref. No. Part No. Description 238–750 BODY, gun 224–949 168–110...
- Page 18 Parts Part No. 238–851 and 239–001 SERVICE NOTES (See Fig. 8 for additional information): Lubricate threads 06759A Torque to 23–27 ft-lb (31–37 N m) Gasket (18) must be replaced if diffuser-seat (15) is removed or replaced to avoid fluid leakage. Gasket (17) must be replaced if fluid connector (30) is removed or replaced to avoid fluid leakage.
- Page 19 Parts Use Only Genuine Graco Parts and Accessories Part No. 238–851 and 239–001 Repair Kits Ref. Kit No. and Kit No. and Includes: Part No. Description Qty. Description i ti Ref. No. Part No. Description 238–750 BODY, gun 239–176 168–110 O-Ring 106–917...
- Page 20 Spray Tip Selection Charts NOTE: Part No. 238–755 Fluid Needle and 224–855 Diffuser- seat must be used with GG4 tips larger than 0.025 in. (0.635 mm). Standard Spray Tips, for use with Air Cap 238–628 Orifice Size Size inches inches (mm) 308–640...
- Page 21 Spray Tip Selection Charts Standard Spray Tips, for use with Air Cap 238–628 *Fluid output at 600 psi (4.1 MPa, 41 bar). Fluid output (Q) at other pressures (P) can be calculated by this formula: Q = (0.041) (QT) ( Where QT = Fluid output (fl oz/min) from the above table for the selected orifice size.
- Page 22 Spray Tip Selection Charts Standard Sealer T ips, for use with AA Reverse-A-Clean (AA RAC ) Spray Tips Air Cap 238–628 NOTE: Part No. 238–755 Fluid Needle and 224–855 Diffuser- seat must be used with GG4 tips larger than 0.025 in. (0.635 mm).
- Page 23 Spray Tip Selection Charts AA Reverse-A-Clean (AA RAC ) Spray Tips *Fluid output at 600 psi (4.1 MPa, 41 bar). 308–640...
- Page 24 Dimensions Technical Data Maximum Working Fluid Pressure ..4000 psi (28 MPa, 280 bar) Maximum Working Air Pressure ... . . 100 psi (0.7 MPa, 7 bar) Maximum Working Fluid Temperature .
- Page 25 Accessories Use Only Genuine Graco Parts and Accessories Grounding Clamp and Wire 222–011 Fluid Swivel Connector 189–018 12 ga, 25 ft (7.6 m) wire 5800 psi (40 MPa, 400 bar) Maximum Working Pressure To ease movement of the gun and fluid hose. 1/4–18...
- Page 26 Notes 308–640...
- Page 27 Notes 308–640...
- Page 28 Graco distributor to the original purchaser for use. With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective.