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Manafacture: Graco Inc. File size: 601.74 kb File name: Language of manual:

The turbine alternator is not operating.* Check if the ES ON-OFF lever is ON (1). Check the air supply to the gun. Check for dirt or moisture in the turbine. See page 30. The gun resistance is faulty. Check the gun resistance. See page 21. Fluid leaks from the needle packing and causes a short. Clean the needle cavity. Replace the fluid needle. See page 28. The turbine alternator is faulty. Be sure the plug is in place on the back of the turbine alternator housing. Remove and test the turbine alternator. See page 30. Operator gets a mild shock The operator is not properly grounded or is near an ungrounded object. Be sure the floor and the operator are properly grounded. See Ground the System, page 10. The gun is not properly grounded. See Check the Electrical Grounding, page 11. Operator gets a shock when touching the workpiece The workpiece is not properly grounded. Clean workpiece hangers. Check for proper grounding on the conveyor or track. * ES indicator light is not on when the gun is triggered. 20 308018 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. Use megohmmeter P/N 241079 (A) and an applied voltage of 500 volts to complete these electrical tests. Connect the leads as shown. WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Megohmmeter P/N 241079 (A-see Fig. 7) is not approved for use in a hazardous area. To reduce the risk of sparking, do not use the megohmmeter to do electrical tests unless: . The gun has been removed from the hazardous area; . Or all spraying devices in the hazardous area are turned off, ventilation fans in the hazardous area are operating, and there are no flammable vapors in the area (such as open solvent containers or fumes from spraying). Failure to follow this warning could cause fire, explosion, electric shock and result in serious injury and property damage. Measure the resistance between the end of the electrode (20) and the gun air fitting (17). See Fig. 7. The resistance should be between 180 to 220 megohms. If the resistance is outside the specified range, go to the next test. If the resistance is correct, refer to the Electrical Troubleshooting chart on page 20 for other possible causes of poor performance. A 20 Test Gun Resistance Check the resistance with the gun triggered and with 06423B the trigger released. The fluid passage must be Fig. 7 flushed and dried to get an accurate reading. Continued on the next page. 308018 21 Electrical Tests 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 cartridge. 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. See Fig. 8. The resistance should be 157.5 to 192.5 megohms. If the resistance is outside the specified range, the power supply is defective and must be replaced. If the resistance of the power supply is correct, proceed to the next test. If you still have problems, refer to the Electrical Troubleshooting chart on page 20 for other possible causes of poor performance, or contact the nearest authorized service agency. A 18c EE 18 Test Resistor Stud Resistance Insert a conductive rod (B) into the gun barrel (removed for the power supply test) and against the metal contact (C) in the front of the barrel. See Fig. 9. Measure the resistance between the conductive rod (B) and the gun electrode (20). The resistance should be 21 to 29 megohms. If the resistance is correct, refer to the Electrical Troubleshooting chart on page 20 for other possible causes of poor performance or contact the nearest authorized service agency. A 20 B C 06448B 03566B Fig. 9 Fig. 8 Continued on the next page. 22 308018 Electrical Tests 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. The resistance should be 21 to 29 megohms. If the resistance is correct, make sure the metal contact (C) E 22 D in the barrel and the needle contact wire (E) are clean. If the resistance is outside the specified range, the Fig. 10 resistor is defective and the resistor stud (22) must be replaced. See Air Cap/Nozzle/Resistor Stud Replacement on page 24. WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD The resistor stud contact ring (D) is a conductive contact ring, not a sealing o-ring. S...

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