Instruction/ maintenance manual of the product 307912 Graco Inc.
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307912 Rev . AC Part No. 222300 shown 06443 INSTRUCTIONS-P ARTS LIST INSTRUCTIONS This manual contains important warnings and information. READ AND KEEP FOR REFERENCE. Model PRO 3500sc Electrostatic Air Spray Gun 65 kV , MANUAL GUN 100 psi (7 bar , 0.
2 307912 T able of Contents Symbols 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . W arnings 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction 5 . . . . . . . . . . . . . . . . . . .
307912 3 W ARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Improper grounding, poor air ventilation, open flames, or sparks can cause a hazardous condition and result in a fire, explosion, or electric shock.
4 307912 W ARNING PRESSURIZED EQUIPMENT HAZARD Spray from the gun, hose leaks, or ruptured components can splash fluid in the eyes or on the skin and cause a serious injury . Do not point the spray gun at anyone or any part of the body . Do not stop or deflect fluid leaks with your hand, body , glove, or rag.
307912 5 Introduction How the Electrostatic Air Spray Gun Works The air hose supplies air to the spray gun. Part of the air operates the turbine and the rest of the air atomizes the fluid being sprayed. The turbine generates power , which is converted by the power cartridge, to supply high voltage current to the gun ’ s ionizing electrode.
6 307912 Installation KEY A Main Air Supply Line B* V entilation Fan Interlock Solenoid V alve C* Main Air Supply Shutoff V alve (bleed-type) D Air & Water Separator E* Pump Air Supply Shutoff V a.
307912 7 Installation Connect the Air Line (Refer to Fig. 1) W ARNING ELECTRIC SHOCK HAZARD T o reduce the risk of an electric shock or other serious injury , the air supply hose must be electrically connected to a true earth ground. Use Only Graco Electrically Con- ductive Air Supply Hose.
8 307912 Installation Ground the System W ARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD When operating the electrostatic device, any ungrounded objects in the spray area (such as people, containers, tools, etc.
307912 9 Installation Check the Electrical Grounding (See Fig. 2) W ARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Megohmmeter P/N 241079 (AA-see Fig.
10 307912 Notes.
307912 1 1 Operation Pressure Relief Procedure W ARNING PRESSURIZED EQUIPMENT HAZARD The system pressure must be manually relieved to prevent the system from starting or spraying acci- dentally .
12 307912 Operation Fig. 4 06443 05151A DD 31 26 43 1 20 45 Selecting a Fluid Nozzle and Air Cap W ARNING PRESSURIZED EQUIPMENT HAZARD T o reduce the risk of an injury , follow the Pressure Relief Procedure on page 1 1 before removing or installing a fluid nozzle and/or air cap.
307912 13 Operation Operating the Spray Gun (continued) 1. Follow the Operating Checklist on page 1 1. 2. T o adjust the air cap for a vertical or horizontal spray pattern, first make sure the pressure is relieved. Then loosen the air cap retaining nut, and rotate the air cap as directed in Fig.
14 307912 Operation Shutdown W ARNING PRESSURIZED EQUIPMENT HAZARD T o reduce the risk of an injury , follow the Pressure Relief Procedure on page 1 1 whenever you stop spraying and whenever you are instructed to relieve pressure. 1. Relieve the pressure.
307912 15 Maintenance Clean the Air Cap and Fluid Nozzle CAUTION Do not use metal tools to clean the air cap or spray nozzle holes as this could scratch them, and make sure the electrode wire is not damaged. Scratches in the air cap or spray nozzle or a damaged electrode wire can distort the spray pattern.
16 307912 T roubleshooting W ARNING ELECTRIC SHOCK HAZARD Installing and servicing this equipment requires access to parts which may cause an electric shock or other serious injury if the work is not performed properly . Do not install or service this equipment unless you are trained and qualified.
307912 17 T roubleshooting Gun Operation T roubleshooting Problem Cause Solution Fluid leakage from the fluid packing area The needle packings or shaft are worn. Replace the packings or shaft; see page 26. The packing nut is loose Tighten the packing nut; see page 26.
18 307912 T roubleshooting Electrical T roubleshooting Problem Cause Solution Poor wrap-around The ES ON-OFF lever is in the OFF (O) position.* Turn the lever to ON (1). The distance between the gun and work- piece is incorrect. Adjust the spraying distance to 8 to 12 inches (203 to 305 mm) The parts are poorly grounded.
307912 19 Electrical T ests The performance and safety of the spray gun are directly affected by the condition of the electrical components contained inside the gun.
20 307912 Electrical T ests T est Power Supply Resistance Remove the power cartridge (18) from the gun handle. See Power Cartridge Replacement on page 27. Remove the turbine alternator from the power car- tridge. See T urbine Alternator Removal on page 28.
307912 21 Electrical T ests T est Resistor Stud Resistance (continued) If the resistance is outside the specified range, remove the resistor stud (22). See Air Cap/Nozzle/Resistor Stud Replacement on page 22. Check the resistance between the black resistor stud contact ring (D) and the needle contact ring (E).
22 307912 Service Prepare the Gun for Service W ARNING ELECTRIC SHOCK HAZARD Installing and servicing this equipment requires access to parts which may cause an electric shock or other serious injury if the work is not performed properly . Do not install or service this equipment unless you are trained and qualified.
307912 23 Service Air Cap/Nozzle/Resistor Stud Replacement (continued) 6. T rigger the gun while installing the fluid nozzle (21) and resistor stud (22) assembly with the multi-tool (62). Tighten until the fluid nozzle seats in the gun barrel. 7. Install the air cap assembly (1, 2, 8).
24 307912 Service Barrel Removal 1. Prepare the gun for service as instructed on page 22. 2. Carefully loosen the nut from the fluid fitting (10). Pull the tube (12) out of the fitting. Make sure both ferrules and the nut stay with the tube. See Fig. 14.
307912 25 Service Fluid Packing Removal 1. Prepare the gun for service as instructed on page 22. 2. Remove the air cap assembly , fluid nozzle and resistor stud and electrode as instructed on page 23. 3. Loosen the trigger screws (4) far enough to remove the trigger (13).
26 307912 Service Fluid Packing and Needle Repair The fluid packings and needle can be replaced as individual parts or as assemblies. The overall assem- bly is pre-adjusted at the factory . NOTE: Before installing the packing and needle as- sembly into the gun barrel, make sure the internal surfaces of the barrel are clean.
307912 27 Service Fig. 18 7 35 37a 37b 18b 18c 18a 18 18d 37 F 05160 Apply a very light coat of lubricant Do not expose to solvents Power Cartridge Replacement NOTE: The power cartridge consists of the alternator (37), power supply (18) and retaining ring (35).
28 307912 Service T urbine Alternator Replacement NOTE: Replace turbine bearings after 2,000 hours of operation. See your authorized Graco representative. 1. Prepare the gun for service as instructed on page 22. 2. Remove the power cartridge from the gun handle as instructed on page 27.
307912 29 Service Fan Air Adjustment V alve Repair 1. Prepare the gun for service as instructed on page 22. 2. Place a wrench on the flats of the valve housing and remove it from the handle. See Fig. 20. NOTE: The fan air valve (43) can be replaced as an assembly or as individual parts.
30 307912 Service Fluid Adjustment Assembly Repair 1. Prepare the gun for service as instructed on page 22. 2. Using a 14 mm socket wrench, remove the fluid adjustment assembly (45). See Fig. 21. 3. T urn the stem (45a) fully clockwise and remove the sleeve stop (45e).
307912 31 Service Air T rigger V alve Repair 1. Prepare the gun for service as instructed on page 22. 2. Using a 14 mm socket wrench, remove the fluid adjustment assembly (45), o-ring (23) and spring (44). See Fig. 21. CAUTION Clean all parts in non-conductive solvent compatible with the fluid being used, such as xylol or mineral spirits.
32 307912 Service ES ON-OFF V alve Repair 1. Prepare the gun for service as instructed on page 22. 2. Loosen the set screw (24) with the 2 mm hex key (69) provided.
307912 33 Notes.
34 307912 Parts Item 18 includes items 18a to 18f Item 28 includes items 28a to 28h Item 37 includes items 37a and 37b Item 43 includes items 43b to 43e Item 45 includes items 45a to 45e 6 7 4 13 3 1 .
307912 35 Parts W ARNING Some PRO 3500sc Gun replacement parts look similar to other PRO Gun parts but are not interchangeable! When servicing, do not mix or use other PRO Gun parts! Use of parts othe.
36 307912 Accessories Use Only Genuine Graco Parts and Accessories AIR LINE ACCESSORIES Conductive Air Supply Hose; black 100 psi (7 bar , 0.7 MPa) Maximum Working Pressure FM Approved; Color coded black; 0.315 in. (8 mm) ID; 1/4 npsm(f) x 1/4 npsm(f) left-hand thread 220444 6 ft (1.
307912 37 Accessories Use Only Genuine Graco Parts and Accessories FLUID LINE ACCESSORIES Fluid Hose Assemblies (Nylon) 225 psi (14 bar , 1.4 MPa) Maximum Working Pressure FM Approved; 1/4 in. (6.35 mm) ID, 3/8 npsm(fbe) 215637 25 ft (8 m) 215638 50 ft (15 m) Fluid Hose Assemblies (Nylon) 500 psi (35 bar , 3.
38 307912 Accessories Use Only Genuine Graco Parts and Accessories MISCELLANEOUS ACCESSORIES Snap Ring Pliers 1 10090 For removing the ES ON-OFF V alve Retaining Ring (item 47 in Parts List). Paint Resistance Meter 722886 Used with 722860 Paint Probe to measure resistance of paint.
307912 39 T echnical Data Category Data Gun Weight 1.87 lb (0.85 Kg) Gun Length 9.5 in. (240 mm) Maximum Working Pressure 100 psi (7 bar , 0.7 MPa) Air Pressure Operating Range 0 – 100 psi (0 – 7 bar , 0 – 0.7 MPa) Fluid Pressure Operating Range 0 – 100 psi (0 – 7 bar , 0 – 0.
40 307912 Graco Standard W arranty Graco warrants all equipment manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale by an authorized Graco distributor to the original purchaser for use.
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However, one of the most important roles played by the user manual is to help in solving problems with Graco Inc. 307912. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Graco Inc. 307912 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
