Graco Inc 3500WB Fluid Adjustment Assembly Repair continued, Air Trigger Valve Repair, Service

Page 36
Fluid Adjustment Assembly Repair (continued)

Service

Fluid Adjustment Assembly Repair (continued)

5.To remove the sleeve (45d), hold the cap (45c) and turn the sleeve stop (45e) counterclockwise with a pliers.

6.Remove the stem (45a) and o-ring (45b).

7.Repair or replace any damaged parts. Lubricate the o-ring (45b).

8.Carefully apply low strength (purple) Loctiter or equivalent thread sealant to the sleeve (45d) external threads. Turn the sleeve in with the sleeve stop (45e) until it is bottomed out, then back it out 1/8 turn.

Air Trigger Valve Repair CAUTION

Do not allow Loctite to get onto the stem (45a) during assembly or the stem will not turn.

9.Place the fluid adjustment assembly on the work- bench with its threaded end facing down and allow the Loctite to cure over night.

10.After the Loctite has cured, assemble the fluid adjustment assembly into the gun.

Air Trigger Valve Repair

1.Prepare the gun for service as instructed on page 30.

2.Using a 14 mm socket wrench, remove the fluid adjustment assembly (45), o-ring (23), and spring (44). See Fig. 22.

3.Loosen the air valve packing nut (40) one full turn. Remove the air valve shaft (39) with a pliers.

Apply a very light coat of lubricant to the o-rings (41, 23). CAUTION

When removing the air valve shaft (39), be careful not to damage the seat area.

4.Check the o-rings (41, 23) for damage and replace them if necessary. Apply a very light coat of petroleum jelly to the o-rings.

Manual background CAUTION

Do not over-lubricate parts. Excessive lubricant on the o-ring (41) and air valve shaft (39) can be pushed into the gun air passage and blemish the finish on the workpiece.

5.Unscrew the packing nut (40) to check the u-cup (42). Do not remove the u-cup unless it is dam- aged.

6.Install the air valve shaft (39), with the o-ring (41), and spring (44) into the back of the gun handle (7). If the u-cup (42) was removed, install the air valve shaft (39) before installing the u-cup. Install the u-cup with its lips facing into the gun handle.

7.Install the fluid adjustment knob (45), with the o-ring (23). Tighten the cap with a screw driver. Tighten the air valve packing nut (40) until it bot- toms.

Apply a very light coat of lubricant to the o-rings (41, 23).

Carefully apply low strength (purple) Loctite or equivalent to sleeve (45d) external thread. Turn sleeve in with sleeve stop (45e) until it bottoms out, then back out 1/8 turn. Allow Loctite to cure overnight.

Do not remove u-cup (42) unless damaged. Install with lips facing into handle. Tighten packing nut (40) until it bottoms.

45

45a 45c

45b  45d

44

39

 41

23

45e

40, 42 

05162B

Fig. 22

36 308584

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Contents INSTRUCTIONS-PARTS LIST 308584100 psi 0.7 MPa, 7 bar Maximum Working Pressure Part No. 222700, Series CTable of Contents SymbolsWarning Symbol Caution SymbolELECTRIC SHOCK HAZARD FIRE AND EXPLOSION HAZARD PRESSURIZED EQUIPMENT HAZARDWarnings are continued on the next page EQUIPMENT MISUSE HAZARD TOXIC FLUID HAZARDIntroduction Spraying Waterborne Fluids ElectrostaticallyOperating the Electrostatics Refer to Fig. 1, pageB A C Graco Waterborne Fluid Hose purchased separately D Inner Hose Layer EE is a PTFE tubeD Conductive Hose Layer DD covers the PTFE tube H2O PRO Voltage Block connection shownInstallation Installing the SystemVentilate the Spray Booth Warning SignsConsult your isolation system manual for other configurations PRO 3500wb Gun shown with the Graco H2O PRO Batch SystemT S N K L M G F NH R B A E D P CInstall the Air Line Accessories Install the Fluid LIne AccessoriesConnect the Air Line Connect the Exhaust TubeFilter the Fluid Connect the Fluid HoseContinued on the next page Connect the Fluid Hose continued H2O PRO Voltage Blockconnection shown Ground the System FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARDCheck the Electrical Grounding Fluid Voltage Discharge and Grounding Procedure Pressure Relief ProcedureOperation Operating Checklist Selecting a Fluid Nozzle and Air CapOperating the Spray Gun FIRE AND EXPLOSION HAZARDCOMPONENT RUPTURE HAZARD Atomizing Air Valve Adjustment Fine Adjustments of the Spray GunMaintenance Daily Care and CleaningShutdown Clean the Air Cap and Fluid Nozzle ProcedureFlush the Spray Gun Equipment neededTroubleshooting Voltage Loss TroubleshootingSpray Gun Waterborne Fluid HoseVoltage Loss Troubleshooting continued TestsElectrical Troubleshooting ProblemSolution CauseSpray Pattern Troubleshooting Poor Electrostatic Wrap Troubleshooting Gun Operation TroubleshootingGun Operation Troubleshooting continued Electrical Tests Test Gun ResistanceTest Power Supply Resistance Test Resistor Stud ResistanceService Prepare the Gun for ServiceAir Cap/Nozzle/Resistor Stud Replacement Tools Included with the GunAir Cap/Nozzle/Resistor Stud Replacement continued InstallationElectrode Needle Replacement Preventative Maintenance If installing the complete fluid rod assembly, go to step 11, pageFluid Packing Rod Removal and Repair WhereFluid Packing Rod Removal and Repair continued Fan Air Adjustment Valve Repair Fluid Adjustment Assembly RepairIf installing the complete valve, go to step DETAILFluid Adjustment Assembly Repair continued Air Trigger Valve Repair Apply a very light coat of lubricant to the o-rings 41 Atomizing Air Valve Repair ES ON-OFF Valve Repair MOVING PARTS HAZARD05363B Barrel Removal Power Supply Replacement  Apply a very light coat of lubricant to the o-rings 37a Do not expose the gasket 18a to solvents Turbine Alternator Replacement Barrel Installation05158B Graco Waterborne Fluid Hose Repair Measurements, inches mmPRO 3500SC Gun Disassembly NOTE Keep all the following parts for reassemblyPRO 3500sc Gun Conversion Installing the Fluid Needle Assembly 10. Tighten the nut 78* onto the ferrule housing Spray Gun Parts See Detail AEQUIPMENT MISUSE HAZARD Part No. 222700, Series C Model PRO 3500wb Spray GunY Replacement Warning signs are available at no cost DescriptionAccessories Use Only Genuine Graco Parts and AccessoriesWaterborne Fluid Hose Assembly 100 psi 0.7 MPa, 7 bar Maximum Working PressureFor use in the Fluid Voltage Discharge and Ground- ing Procedure Manual Change SummarySnap Ring Pliers Gun High Voltage Probe & MeterPage Technical Data CategoryData The Graco Warranty and Disclaimers Graco Phone NumberWARRANTY EQUIPMENT NOT COVERED BY GRACO WARRANTY
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