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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. 238402, 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. 238851, 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. 238852, Series A
Spray Gun with standard spray tip, tip guard, air cap,
and quick-disconnect air line fitting.
Part No. 238883, Series A
Hi-Flow Spray Gun with Hi-Flow fluid needle and
diffuser-seat, and standard spray tip, tip guard, air cap,
and 1/4–18 npsm (R1/4–19) air line fitting.
Part No. 239001, Series B
Hi-Flow Spray Gun with Hi-Flow fluid needle and
diffuser-seat, AA Reverse-A-Clean (RAC) assembly,
and 1/4–18 npsm (R1/4–19) air line fitting.
Part No. 241070, Series A
HVLP Spray Gun with standard spray tip, HVLP air
cap, 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
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
Spray Gun
COPYRIGHT 1996, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
308640
Supersedes G
First choice when
includes Rev. H
quality counts.
Part No. 238402 Spray Gun shown
Rev. J
05985
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Summary of Contents for Graco 308640
- Page 1 Patents Pending Foreign Patents Pending GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 Spray Gun COPYRIGHT 1996, GRACO INC. Graco Inc. is registered to I.S. EN ISO 9001 308640 Rev. J Supersedes G First choice when includes Rev. H quality counts.
- Page 2 Due to the very high pressure fluid emitted, a strong recoil action will occur when you trigger this gun. If you are unprepared, your hand could be forced back toward your body or you could lose your bal- ance and fall, resulting in serious injury. 308640 Table of Contents Spray Tip Selection Chart...
- Page 3 Do not turn on or off any light switch in the spray area while operating or if fumes are present. Do not smoke in the spray area. Do not operate a gasoline engine in the spray area. If there is any static sparking while using the equipment, stop spraying immediately. Identify and correct the problem. WARNING 308640...
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Page 4: Typical Installation
The typical installation shown in Fig. 1 is only a guide for selecting and installing air-assisted spray systems. It is not an actual system design. Contact your Graco distributor for assistance in designing a system to meet your needs. 308640 Installation Grounded Fluid Hose Pump Air Line... - Page 5 4. Install an in-line fluid filter (N) on the gun fluid fitting (W) to avoid clogging the spray tip with particles from the fluid. 5. Connect the grounded fluid hose (H) to the gun fluid fitting (W) or optional in-line filter (N). WARNING 308640...
- Page 6 2. Air compressors and hydraulic power sup- plies: Ground them according to the manufacturer recommendations. 308640 Installation 3. Air , fluid, and hydraulic hoses connected to the pump : Use only electrically conductive hoses with a maximum of 500 feet (150 m) combined hose length to ensure grounding continuity.
- Page 7 Now clear the tip or hose obstruction. Trigger Safety Locked or in ON SAFE Position Fig. 2 Trigger Safety Unlocked or in OFF SAFE Position 05987 308640...
- Page 8 Use the Spray Tip Selection Chart, on page 22, as a guide for selecting an appropriate spray tip for your application. 308640 Operation Install a Spray Tip WARNING...
- Page 9 AA RAC assembly as the air separa- tor, part no. 178414, must be removed when the RAC assembly is installed. Fig. 4 No Air Too Little Air Fig. 5 Pattern Adjustment Knob 0789A Right Amount of Air 0792 308640...
- Page 10 Openings in the tip guard reduce paint buildup on the guard while spraying. Damage to the sharp edges of the openings will cause paint to collect at that area. To avoid damage, never hang the gun by the tip guard. 308640 Operation Fig. 6 RIGHT WRONG...
- Page 11 See Fig. 7. If the fluid coming from the gun is not diffused into an irregular stream, replace the diffuser-seat immediately. Maintain firm metal-to-metal contact between the gun and a grounded metal container. Fig. 7 Ä Ä Ä Ä Ä Ä Ä Ä Ä 05988 308640...
- Page 12 If it is available, the flushing procedure provided in the pump or sprayer manual should be used instead of this procedure. 308640 Operation 1. Relieve the pressure as instructed on page 7. 2. Disconnect the atomizing air hose and the fluid supply line.
- Page 13 Notes 308640...
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Page 14: Troubleshooting
Air leakage from front of gun Fluid leakage from front of gun Fluid in air passages Slow fluid shut-off 308640 Troubleshooting NOTE: Check all possible remedies in the troubleshooting charts before disassembling the gun. Some improper patterns are caused by the improper balance between air and fluid. - Page 15 Clean spray tip. See page 11. Clean air horn holes with solvent and soft brush. See page 11. Clean air horn holes with solvent and soft brush. See page 11. 308640...
- Page 16 Replace as needed. 7. For best air valve life, lubricate the external air valve stem (C) with light oil after each day’s use. 308640 Service Fluid Needle Cartridge Service Follow the procedure below to remove the fluid needle cartridge for cleaning or for replacement.
- Page 17 Do not lubricate If the gun has the AA RAC assembly, tighten the air cap retaining ring until it bottoms out, while holding the orange tip guard in the desired direction. Torque to 90–100 in-lb (10.2–11.2 N m). FLUID 308640 05989...
- Page 18 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. 308640 Parts Gasket (17) must be replaced if fluid connector (30) is removed or replaced to avoid fluid leakage.
- Page 19 168110 O-Ring 105456 Retainer 106903 Spring 238755 Needle 111516 O-Ring 111517 Backup Ring 107079 O-Ring 224855 Diffuser-seat 178422 Gasket 187521 Gasket 105452 U-Cup 217487 Valve 238755 Needle 111516 O-Ring 111517 Backup Ring 224855 Diffuser-seat 178422 Gasket 187521 Gasket 308640 Qty.
- Page 20 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. 308640 Parts 06759B...
- Page 21 Gasket 187521 Gasket 168110 O-Ring 105456 Retainer 106903 Spring 238755 Needle 111516 O-Ring 111517 Backup Ring 239173 Diffuser-seat 178422 Gasket 187521 Gasket 105452 U-Cup 217487 Valve 238755 Needle 111516 O-Ring 111517 Backup Ring 239173 Diffuser-seat 178422 Gasket 187521 Gasket 308640...
- Page 22 4–6 0.013 13.0 (0.330) (100–150) (0.4) 6–8 (150–200) 8–10 (200–250) 10–12 (250–300) 12–14 (300–350) 14–16 (350–400) 308640 Fan Width Fan Width Orifice Orifice at 12 at 12” Part No Part No. Size (300 mm) 0.015 4–6 (100–150) (0.381) GG4107 6–8 (150–200)
- Page 23 (1.9) (1.7) GG4629 GG4431 78.0 69.0 (2.2) (2.0) GG4631 GG4931 88.0 79.0 GG4633 (2.5) (2.3) GG4833 GG4933 GG4435 98.0 89.0 (2.8) (2.5) GG4535 GG4635 GG4835 GG4935 108.0 99.0 GG4737 (3.1) (2.8) GG4439 118.0 109.0 (3.4) (3.1) GG4539 GG4639 GG4839 308640...
- Page 24 AA RAC Tips (AARXXX). The air separator (item 16) must be removed when using the AA RAC. AA RAC Conversion Kits are available. See page 27. 308640 with AA Reverse-A-Clean (AA RAC ) Spray Tips Orifice Size...
- Page 25 05985 *Light to *Light to Medium Medium *Heavy Heavy Viscosity Viscosity Part No. 58.5 50.0 242427 (1.7) (1.4) 68.0 59.0 242529 (1.9) (1.7) 242531 78.0 69.0 (2.2) (2.0) 242631 – – – 8.3 (210) 7.7 (196) – – 308640...
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Page 26: Technical Data
0.42, 4.2 0.28, 2.8 0.14, 1.4 0.14 0.28 0.42 GUN INLET AIR PRESSURE 308640 Technical Data ..4000 psi Sound Data (28 MPa, 280 bar) 100 psi Gun with GG4 spray tip and 239781 air cap (0.7 MPa, 7 bar) - Page 27 6 ft. (1.83 m) hose Description AA RAC AIR CAP ASSEMBLY RAC HOUSING TIP CYLINDER; tip of choice Includes item 3a FLUID SEAT DIFFUSER-SEAT; Included with Kit 240462 only DIFFUSER-SEAT, hi-flow; Included with Kit 240463 only GASKET, fluid; acetal homopolymer (black) 308640 Qty. 06765B...
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Page 28: Graco Standard Warranty
Graco reserves the right to make changes at any time without notice. Sales Offices: Minneapolis, Detroit Foreign Offices: Belgium, England, Korea, France, Germany, Hong Kong, Japan GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 http://www.graco.com PRINTED IN U.S.A. 308640 April 1996 Revised December 1998 308640...