Graco PRO 3500sc - Manuals

307912 5 Introduction How the Electrostatic Air Spray Gun Works The air hose supplies air to the spray gun. Part of theair operates the turbine and the rest of the air atomizesthe fluid being sprayed. The turbine generates power,which is converted by the power cartridge, to supplyhigh voltage curren...

6 307912 Installation KEY A Main Air Supply Line B* Ventilation Fan Interlock Solenoid ValveC* Main Air Supply Shutoff Valve (bleed-type)D Air & Water Separator E* Pump Air Supply Shutoff Valve (bleed-type)F Air Line Lubricator G Air Pressure Regulator H Pump J* Pump Ground WireK Fluid Filter L ...

307912 7 Installation Connect the Air Line (Refer to Fig. 1) WARNING ELECTRIC SHOCK HAZARDTo reduce the risk of an electric shock orother serious injury, the air supply hosemust be electrically connected to a true earth ground. Use Only Graco Electrically Con-ductive Air Supply Hose. 1. Connect the ...

8 307912 Installation Ground the System WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARDWhen operating the electrostatic device,any ungrounded objects in the sprayarea (such as people, containers, tools,etc.) can become electrically charged.Improper grounding can result in staticsparking, which ca...

307912 11 Operation Pressure Relief Procedure WARNING PRESSURIZED EQUIPMENT HAZARDThe system pressure must be manually relieved toprevent the system from starting or spraying acci-dentally. To reduce the risk of an injury from electricshock, accidental spray from the gun, splashingfluid, or moving p...

12 307912 Operation Fig. 4 06443 05151A DD 31 26 43 1 20 45 Selecting a Fluid Nozzle and Air Cap WARNING PRESSURIZED EQUIPMENT HAZARDTo reduce the risk of an injury, follow the PressureRelief Procedure on page 11 before removing orinstalling a fluid nozzle and/or air cap. The gun is supplied with a ...

14 307912 Operation Shutdown WARNING PRESSURIZED EQUIPMENT HAZARDTo reduce the risk of an injury, follow the PressureRelief Procedure on page 11 whenever you stopspraying and whenever you are instructed torelieve pressure. 1. Relieve the pressure. 2. Flush and clean the equipment. Follow the instruc...

307912 15 Maintenance Clean the Air Cap and Fluid Nozzle CAUTION Do not use metal tools to clean the air cap or spraynozzle holes as this could scratch them, and makesure the electrode wire is not damaged. Scratches inthe air cap or spray nozzle or a damaged electrodewire can distort the spray patte...

16 307912 Troubleshooting WARNING ELECTRIC SHOCK HAZARDInstalling and servicing this equipmentrequires access to parts which maycause an electric shock or other serious injury if the work is not performed properly. Do notinstall or service this equipment unless you aretrained and qualified. WARNING ...

307912 17 Troubleshooting Gun Operation Troubleshooting Problem Cause Solution Fluid leakage from the fluid packingarea The needle packings or shaft are worn. Replace the packings or shaft; see page26. The packing nut is loose Tighten the packing nut; see page 26. Air leakage from the front of the g...

18 307912 Troubleshooting Electrical Troubleshooting 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...

307912 19 Electrical Tests The performance and safety of the spray gun aredirectly affected by the condition of the electricalcomponents contained inside the gun. The electricaltests below can be used to determine the condition ofthe power supply (18) and the resistor stud (22) as wellas the continu...

20 307912 Electrical Tests Test 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 Turbine Alternator Removal on page 28. Measure the resistance from the power supply’sgr...

307912 21 Electrical Tests Test Resistor Stud Resistance (continued) If the resistance is outside the specified range, removethe resistor stud (22). See Air Cap/Nozzle/ResistorStud Replacement on page 22. Check the resistancebetween the black resistor stud contact ring (D) andthe needle contact ring...

22 307912 Service Prepare the Gun for Service WARNING ELECTRIC SHOCK HAZARDInstalling and servicing this equipmentrequires access to parts which maycause an electric shock or other serious injury if the work is not performed properly. Do notinstall or service this equipment unless you aretrained and...

307912 23 Service Air Cap/Nozzle/Resistor StudReplacement (continued) 6. Trigger 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 gunbarrel. 7. Install the air cap assembly (1, 2, 8). Test the gunresist...

24 307912 Service Barrel Removal 1. Prepare the gun for service as instructed on page22. 2. Carefully loosen the nut from the fluid fitting (10).Pull the tube (12) out of the fitting. Make sure bothferrules and the nut stay with the tube. See Fig.14. 3. Using the wrench (63) supplied, loosen the thr...

307912 25 Service Fluid Packing Removal 1. Prepare the gun for service as instructed on page22. 2. Remove the air cap assembly, fluid nozzle andresistor stud and electrode as instructed on page23. 3. Loosen the trigger screws (4) far enough toremove the trigger (13). 4. Remove the packing cartridge ...

26 307912 Service Fluid Packing and Needle Repair The fluid packings and needle can be replaced asindividual 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 internalsurfaces of t...

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). SeeFig. 18. 1. Prepare the gun for serv...

28 307912 Service Turbine Alternator Replacement NOTE: Replace turbine bearings after 2,000 hours ofoperation. See your authorized Graco representative. 1. Prepare the gun for service as instructed on page22. 2. Remove the power cartridge from the gun handleas instructed on page 27. 3. Squeeze the t...

307912 29 Service Fan Air Adjustment Valve Repair 1. Prepare the gun for service as instructed on page22. 2. Place a wrench on the flats of the valve housingand remove it from the handle. See Fig. 20. NOTE: The fan air valve (43) can be replaced as anassembly or as individual parts. To disassemble t...

30 307912 Service Fluid Adjustment Assembly Repair 1. Prepare the gun for service as instructed on page22. 2. Using a 14 mm socket wrench, remove the fluidadjustment assembly (45). See Fig. 21. 3. Turn the stem (45a) fully clockwise and removethe sleeve stop (45e). 4. To completely disassemble the f...

307912 31 Service Air Trigger Valve Repair 1. Prepare the gun for service as instructed on page22. 2. Using a 14 mm socket wrench, remove the fluidadjustment assembly (45), o-ring (23) and spring(44). See Fig. 21. CAUTION Clean all parts in non-conductive solvent compatiblewith the fluid being used,...

32 307912 Service ES ON-OFF Valve Repair 1. Prepare the gun for service as instructed on page22. 2. Loosen the set screw (24) with the 2 mm hex key(69) provided. Remove the lever (26) from thevalve. See Fig. 23. WARNING MOVING PARTS HAZARDTo reduce the risk of eye injury, be sureto wear safety glass...

34 307912 Parts Item 18 includes items 18a to 18fItem 28 includes items 28a to 28hItem 37 includes items 37a and 37bItem 43 includes items 43b to 43eItem 45 includes items 45a to 45e 6 7 4 13 3 1 8 2 22 20 21 25* 28 35 34 44 45d 23 39 40 42 66 17 15 19 33 12 14 10 *29 24 26 36 46 38 47 32 31 9* 16 4...

307912 35 Parts WARNING Some PRO 3500sc Gun replacement parts look similar toother PRO Gun parts but are not interchangeable! Whenservicing, do not mix or use other PRO Gun parts!Use of parts other than those specified in the parts listbelow could alter the grounding continuity of the gun,cause part...

36 307912 Accessories Use Only Genuine Graco Parts and Accessories AIR LINE ACCESSORIES Conductive Air Supply Hose; black100 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 (1.8 m) 218100 15 ft (...

307912 39 Technical Data Category Data Gun Weight 1.87 lb (0.85 Kg) Gun Length 9.5 in. (240 mm) Maximum WorkingPressure 100 psi (7 bar, 0.7 MPa) Air PressureOperating Range 0–100 psi (0–7 bar, 0–0.7 MPa) Fluid PressureOperating Range 0–100 psi (0–7 bar, 0–0.7 MPa) Voltage Output 0–65 kV Paint Resist...