Graco TI3840a important safety instructions Piston and Purge Rod

Page 42

Repair

Piston and Purge Rod

1. Follow Pressure Relief Procedure, page 18.

2. Flush Gun, page 22.

3. Disconnect air (D) and remove fluid manifold (G).

G

D

TI3837a

4. Disassemble Front End, page 35.

5. Unscrew purge rod stop (15) to remove piston

safety lock assembly. Inspect o-rings (14, 18) in place.

15

18

14

TI3847a

6. Pull purge rod to remove piston (32). Inspect pis-

ton o-ring (16) and shaft o-ring (19).

32

19 16

TI3846a

7. Inspect purge rod (31) for scratches or damage.

Unscrew rod from piston with nut driver. Inspect o-ring (18). Liberally lubricate with Fusion Gun Lubricant, page 53. To reassemble, thread purge rod (31) into piston (32) just until o-ring (18) is not visible.

32

31

18

19

16	TI3848a

8. Liberally lubricate piston o-rings. Reinstall piston.

Shaft is keyed for proper assembly. Push firmly to seat piston. Rotate piston/purge rod assembly clockwise with nut driver until piston is fully seated.

TI3846a

42

309856U

Image 42

Contents Important Safety Instructions Plural Component, Impingement Mix Mechanical Purge Spray GunContents Manual Conventions List of Models/Selection Guide Standard Round Pattern GunsPressure in psi MPa, bar Standard Flat Pattern Guns 247291, aDirect Impingement Round Pattern Guns Flow Rate in gpm lpmDirect Impingement Flat Pattern Guns Four-Hose Gun Personal Protective Equipment Fire and Explosion Hazard Overall View KeyKeep a and B Components Separate Piston Safety LockIsocyanate Hazard GroundingSetup ISODisengage piston safety lock, Adjust Purge Rod 1/4 TurnAdjust Flat CeramTip Daily Shutdown Follow Pressure Relief Procedure,Shutdown Shutdown for More than a DayPressure Relief Procedure Optional Configurations Optional Fluid Manifold PositionFluid Hoses Follow Pressure Relief Procedure, page 18. AlsoOptional Hose Position Air HoseMaintenance Clean Muffler Clean Outside of GunClean Air Cap Clean Fluid ManifoldClean Slip-Fit Polycarballoy Mix Module Cleaning Component a ISO PortsImpingement Port Cleanout Drill Sizes XF1313 #81 Cleanout Drill Sizes for Round CeramTips Clean CeramTipExternal Quick Cleaning Method Round CeramTipClean Purge Rod Adjust Purge Rod,Stuck Purge Rod Adjust Front Rod Seal Reassemble Front End, Adjust Purge Rod,Disassemble Front End, Adjust Rear Rod Seal Troubleshooting See Clean Purge Rod,Adjust Rear Rod Seal, Theory of Operation Gun Triggered Fluid SprayingGun Detriggered Mechanical Purging Cutaway View Lubrication RepairTools Required Replace CeramTipDisassemble Front End Reassemble Front End Adjust Purge Rod, Slip-Fit Polycarballoy Mix Module Attach fluid manifold. Return gun to service Rear Rod Seal Check Valves Piston and Purge Rod Install piston safety lock assembly until bottomed out Piston Safety Lock Air Valve309856U Parts Flush Manifold DetailPart No. Description Qty HandleStandard Round Pattern Guns Slip-Fit Polycarballoy Mix Module KitsSlip-Fit Polycarballoy Mix Module Part Numbering Code Standard Flat Pattern GunsDirect Impingement Round Pattern Guns Direct Impingement Flat Pattern GunsFlat CeramTip Part Numbering Code CeramTip KitsRound CeramTip Part Numbering Code Flat CeramTipsDrill Bit Kits Kit Part No Qty in Kit Drill Bit Size Illustration NominalGun Repair Kits Check Valve Filter Screen Kits 10 per kitAccessories Solvent Flush Pail Kit Hose Adapter KitsPour Nozzle Kit Technical Data Category DataGraco Standard Warranty Graco InformationToll Free