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manual abstract
NOTE: Be sure the seal (B) is in place on the end of the power supply before installing the power supply back into the gun. Test Resistor Stud Resistance (See Fig. 10) Remove the resistor stud (22). See Air Cap/Nozzle/ Resistor Stud Replacement, page 22. Check the resistance between the black resistor stud contact ring (D) and the needle contact ring (E). 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 in the gun barrel and the needle contact ring (E) are clean. If the resistance is outside the specified range, the resistor is defective and the resistor stud (2) must be replaced. See Air Cap/Nozzle/Resistor Stud Replacement. WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD The resistor stud contact ring (D) is a conductive contact ring, not a sealing o-ring. See Fig. 10. To reduce the risk of sparking or electric shock, do not remove the resistor stud contact ring (D) or operate the gun without the contact ring in place. Do not replace the resistor stud (22) with anything but a genuine Graco part. 18 EE A B D 22 E 0442 Fig. 10 TI0378 Fig. 9 308131 21 Service Prepare the Gun for Service Air Cap/Nozzle/Resistor Stud Replacement 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. WARNING PRESSURIZED EQUIPMENT HAZARD To reduce the risk of injury, follow the Pressure Relief Procedure on page 11 before checking or servicing any part of the system and whenever you are instructed to relieve the pressure. NOTE: . Check all possible remedies in Troubleshooting before disassembling the gun. . If the plastic parts of the gun must be held securely, always clamp them in padded vice jaws to prevent damage to the parts. . Lightly lubricate o-rings and seals with petroleum jelly. Do not over-lubricate. . Only use genuine Graco parts. Do not mix or use parts from other PRO Gun models. See page 35. 1. Flush the gun as instructed in Flush the Spray Gun, page 15. 2. Relieve the pressure. 3. Disconnect the air and fluid lines from the gun. 4. Remove the spray gun from the worksite for service or repair. Service or repair area must be clean. CAUTION Hold the front end of the gun up and trigger the gun while removing the nozzle and resistor stud to help drain the gun and prevent any paint or solvent left in the gun from entering the air passages. 1. Prepare the gun for service as instructed at left. 2. Remove the air cap assembly. Point front end of the gun up and squeeze the trigger while removing the fluid nozzle/resistor stud (21, 22) assembly with the multi-tool (62). See Fig.11, page 23. NOTE: If the resistor stud remains in the gun when the fluid nozzle is removed, start the nozzle thread onto the stud and pull the stud out. 3. Unscrew and remove the resistor stud (22) with the multi-tool (62). See Fig. 12. WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD The resistor stud contact ring (D) is a conductive contact ring, not a sealing o-ring. See Fig. 11. To reduce the risk of sparking or electric shock, do not remove the resistor stud contact ring (D) except to replace it and never operate the gun without the contact ring in place. Do not replace the contact ring with anything but a genuine Graco part. To install the resistor stud: 4. Lightly lubricate the o-ring (25) with petroleum jelly and install it on the resistor stud (22). 5. Using the multi-tool (62), install the resistor stud (22) in the fluid nozzle (21). Tighten to 10 in-lb (1.12 Nm). NOTE: Make sure the electrode needle (20) is tightened properly, as shown in Fig. 13. Continued on the next page. 22 308131 308131 23 Service 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 (1/8 to 1/4 turn past hand tight). 7. Install air cap assembly (1, 8, 49) and retaining ring (2). Test gun resistance as instructed on page 20. 05154A Fig. 11 20 1, 8, 49 21 22 2 25 62 D Apply a very light coat of lubricant Tighten 1/8 to 1/4 turn past hand tight 0444A 21 22 62 Fig. 12 Torque to 10 in-lbs (1.12 Nm) Electrode Needle Replacement 1. Prepare the gun for service as instructed on page 22. 2. Remove the air cap, nozzle and resistor stud as instructed on page 22. 3. Unscrew and remove the electrode needle (20) with the multi-tool (62). Hold the fluid rod end to prevent it from turning. See Fig. 13. CAUTION Be careful not to damage the contact wire when removing the electrode from the gun. 4. Apply low-strength (purple) Loctite or equivalent thread sealant to the electrode needle and fluid rod threads. Install the electrode needle finger-tight. Do not ove...
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