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INSTRUCTIONS-PARTS LIST
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
Model PRO 3500hct
Electrostatic Air Spray Gun
65 kV, HIGH CONDUCTIVITY, MANUAL GUN
100 psi (7 bar, 0.7 MPa) Maximum Working Pressure
For use with electrically conductive, solvent based coatings, including metal flake paint
Part No. 222625, Series B
PRO 3500hc Electrostatic High Conductivity Air Spray Gun
Part No. 223451 Conversion Kit
To change the PRO 3500sct Spray Gun to the PRO 3500hc Spray Gun
NOTE: Any modification of genuine Graco parts or replacement of parts
with non-Graco parts will void agency approvals.
U.S. Patent No. 4,290,091; 4,219,865; 4,497,447; 4,462,061; 4,660,774; D313,064; 4,978,075
Patented 1986, 1987, 1990 Canada
Brevete 1986, 1987, 1990
U.K. Patent No. 2,147,158; 2,142,559B; 2,140,327B
French Patent No. 89 16305
Other U.S. and Foreign Patents Pending
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
ECOPYRIGHT 1989, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
308018
Rev. W
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Table of Contents
Troubleshooting
Related Manuals for Graco 222625
Summary of Contents for Graco 222625
- Page 1 65 kV, HIGH CONDUCTIVITY, MANUAL GUN 100 psi (7 bar, 0.7 MPa) Maximum Working Pressure For use with electrically conductive, solvent based coatings, including metal flake paint Part No. 222625, Series B PRO 3500hc Electrostatic High Conductivity Air Spray Gun Part No. 223451 Conversion Kit...
- Page 2 308018...
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Page 3: Table Of Contents
Warnings ........Symbols ........Introduction . - Page 4 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. D Electrostatic equipment must be used only by trained, qualified personnel who understand the requirements stated in this instruction manual.
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Page 5: Warnings
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. D Do not point the spray gun at anyone or any part of the body. D Do not stop or deflect fluid leaks with your hand, body, glove, or rag. -
Page 6: 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. - Page 7 Converting a PRO 3500sc Gun to a PRO 3500hc Gun Fig. C Fig. A Fig. B Fig. D 308018...
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Page 8: Installation
B* C* D Non-hazardous Area The air supply to the gun must be electrically interlocked with the ventilators to prevent the power supply from operating without ventilating fans on. Main Air Supply Line B* Ventilation Fan Interlock Solenoid Valve C* Main Air Supply Shutoff Valve (bleed-type) Air &... -
Page 9: Installing The System
Installing the System WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Installing and servicing this equipment requires access to parts which may cause electric shock or other serious injury if work is not performed properly. D Do not install or service this equip- ment unless you are trained and qualified. -
Page 10: Connect The Exhaust Tube
Connect the Exhaust Tube Press the exhaust tube (provided) onto the barbed adapter on the bottom of the gun handle. Secure the tube with the clamp provided. Refer to page 36. Connect the Fluid Line (Refer to Fig. 1) 1. Before connecting the fluid line (N), blow it out with air and flush it with solvent. -
Page 11: Check The Electrical Grounding
Check the Electrical Grounding WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Megohmmeter P/N 241079 (AA-see Fig. 2) is not approved for use in a hazard- ous area. To reduce the risk of sparking, do not use the megohmmeter to check electrical grounding unless: D The gun has been removed from the hazardous area;... - Page 12 Notes 308018...
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Page 13: Operation
Pressure Relief Procedure WARNING PRESSURIZED EQUIPMENT HAZARD The system pressure must be manually relieved to prevent the system from starting or spraying acci- dentally. To reduce the risk of an injury from electric shock, accidental spray from the gun, splashing fluid, or moving parts, follow the Pressure Relief Procedure whenever you: D are instructed to relieve the pressure,... -
Page 14: Selecting A Fluid Nozzle And Air Cap
Fig. 4 Selecting a Fluid Nozzle and Air Cap WARNING PRESSURIZED EQUIPMENT HAZARD To reduce the risk of an injury, follow the Pressure Relief Procedure on page 13 before removing or installing a fluid nozzle and/or air cap. The gun is supplied with a 0.059 in. (1.5 mm) fluid nozzle, P/N 185158, and air cap, P/N 193033. - Page 15 Operating the Spray Gun (continued) 1. Follow the Operating Checklist on page 13. 2. To 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.
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Page 16: Shutdown
Shutdown WARNING PRESSURIZED EQUIPMENT HAZARD To reduce the risk of an injury, follow the Pressure Relief Procedure on page 13 whenever you stop spraying and whenever you are instructed to relieve pressure. Daily Care and Cleaning WARNING PRESSURIZED EQUIPMENT HAZARD To reduce the risk of an injury, follow the Pressure Relief Procedure on page 13 when you stop spraying, before cleaning or flushing the spray gun,... -
Page 17: Clean The Air Cap And Fluid Nozzle
Clean the Air Cap and Fluid Nozzle CAUTION Do not use metal tools to clean the air cap or spray tip holes as this could scratch them, and make sure the electrode wire is not damaged. Scratches in the air cap or spray tip or a damaged electrode wire can distort the spray pattern. -
Page 18: Troubleshooting
WARNING 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. -
Page 19: Gun Operation Troubleshooting
Gun Operation Troubleshooting Problem Fluid leakage from the fluid packing area Air leakage from the front of the gun Fluid leakage from the front of the gun The needle is worn or damaged. “Orange Peel” finish Excessive spray fog No fluid sprays from the gun The equipment is covered with fluid The air cap is dirty Troubleshooting... -
Page 20: Electrical Troubleshooting
Electrical Troubleshooting Problem Cause Poor wrap-around The ES ON-OFF lever is in the OFF (O) position.* The distance between the gun and work- piece is incorrect. The parts are poorly grounded. The booth exhaust velocity is too high. The atomizing air pressure is too high. The fluid pressure is too high. -
Page 21: Electrical Tests
The performance and safety of the spray gun are directly affected by the condition of the electrical components contained inside the gun. The electrical tests below can be used to determine the condition of the power supply (18) and the resistor stud (22) as well as the continuity of the electrical path between the components. -
Page 22: Test Power Supply Resistance
Test Power Supply Resistance Remove the power cartridge (18) from the gun handle. See Power Cartridge Replacement on page 29. Remove the turbine alternator from the power car- tridge. See Turbine Alternator Removal on page 30. Measure the resistance from the power supply’s ground contact point (EE) to the contact spring (18c) on the other end of the power supply. - Page 23 Test 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 24. Check the resistance between the black resistor stud contact ring (D) and the needle contact ring (E). Refer to Fig. 10. You may have to press down on the contact ring (D) in several places to get a good reading.
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Page 24: Service
Prepare the Gun for Service WARNING ELECTRIC SHOCK HAZARD Installing and servicing this equipment requires access to parts that may cause 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. -
Page 25: Electrode Replacement
Air Cap/Nozzle/Resistor Stud Replacement (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 gun barrel. 7. Install the air cap assembly (1, 2, 8). Test the gun resistance as instructed on page 21. -
Page 26: Barrel Removal
Barrel Removal 1. Prepare the gun for service as instructed on page 2. Carefully loosen the nut (14) from the bracket/fluid fitting (16). Pull the tube (12) out of the fitting. Make sure both ferrules and the nut stay with the tube. -
Page 27: Fluid Packing Removal
Fluid Packing Removal 1. Prepare the gun for service as instructed on page 2. Remove the air cap assembly, fluid nozzle and resistor stud, and electrode as instructed on page 3. Loosen the trigger screws (4) far enough to re- move the trigger (13). -
Page 28: Fluid Packing And Needle Repair
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. -
Page 29: Power Cartridge Replacement
Apply a very light coat of lubricant Do not expose to solvents Fig. 18 Power Cartridge Replacement NOTE: The power cartridge consists of the alternator (37), power supply (18) and retaining ring (35). See Fig. 18. 1. Prepare the gun for service as instructed on page 2. -
Page 30: Turbine Alternator Replacement
Turbine Alternator Replacement NOTE: Replace turbine bearings after 2,000 hours of operation. See your authorized Graco distributor. 1. Prepare the gun for service as instructed on page 2. Remove the power cartridge from the gun handle as instructed on page 29. 3. -
Page 31: Fan Air Adjustment Valve Repair
Fan Air Adjustment Valve Repair 1. Prepare the gun for service as instructed on page 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. -
Page 32: Fluid Adjustment Assembly Repair
Fluid Adjustment Assembly Repair 1. Prepare the gun for service as instructed on page 2. Using a 14 mm socket wrench, remove the fluid adjustment assembly (45). See Fig. 21. 3. Turn the stem (45a) fully clockwise and remove the sleeve stop (45e). 4. -
Page 33: Air Trigger Valve Repair
Air Trigger Valve Repair 1. Prepare the gun for service as instructed on page 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. -
Page 34: Es On-Off Valve Repair
ES ON-OFF Valve Repair 1. Prepare the gun for service as instructed on page 2. Loosen the set screw (24) with the 2 mm hex key (69) provided. Remove the lever (26) from the valve. See Fig. 23. WARNING MOVING PARTS HAZARD To reduce the risk of eye injury, be sure to wear safety glasses when removing or installing the retaining ring (47) as the... -
Page 35: Tube And Shroud Removal/Replacement
Tube and Shroud Removal/Replacement 1. Prepare the gun for service as instructed on page 2. Remove the air cap, nozzle and resistor stud, and electrode as instructed on page 29. 3. Loosen the nut (14) and disconnect the fluid tube (12) from the bracket/fluid fitting (16). -
Page 36: Parts
DETAIL A 308018 Parts See Detail A 18b* 18a* 40 42* REF. 16 Item 12 includes items 12a to 12e 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 43e*... - Page 37 Part No. 222625, Series B, Electrostatic High Conductivity Air Spray Gun Part No. Description 193033 AIR CAP;...
- Page 38 Part No. 223451 Conversion Kit Kit must be purchased separately. Part No. Description 186102 SHROUD 223450 TUBE, fluid Includes items 12a–12e 111450 O-RING; fluoroelastomer 110749 O-RING; fluoroelastomer 110079 NUT, fluid tube 110077 FERRULES, fluid tube 111450 O-RING; fluoroelastomer 223444 FLUID PACKING & NEEDLE ASSY Includes items 28a–28h DETAIL A 308018...
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Page 39: 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 (1.8 m) 218100... - Page 40 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, 3.5 MPa) Maximum Working Pressure FM Approved;...
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Page 41: Technical Data
Category Data Gun Weight 1.89 lb (0.86 kg) Gun Length 9.5 in. (240 mm) Maximum Working 100 psi (7 bar, 0.7 MPa) Pressure Air Pressure 0–100 psi (0–7 bar, Operating Range 0–0.7 MPa) Fluid Pressure 0–100 psi (0–7 bar, Operating Range 0–0.7 MPa) Voltage Output 0–65 kV... - Page 42 Notes 308018...
- Page 43 Notes 308018...
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Page 44: The Graco Warranty And Disclaimers
Graco Standard Warranty 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. 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.