Piston and Purge Rod | Graco Inc TI3840a, 309856P, 2004230905

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

309856P

Image 42

Graco Inc TI3840a, 309856P, 2004230905 important safety instructions Piston and Purge Rod

Contents

Plural Component, Impingement Mix Mechanical Purge Spray Gun Contents Manual Conventions List of Models/Selection Guide Standard Round Pattern GunsPressure in psi MPa, bar Standard Flat Pattern Guns Direct Impingement Round Pattern Guns Flow Rate in gpm lpm Direct Impingement Flat Pattern Guns Four-Hose Gun Personal Protective Equipment Fire and Explosion Hazard Overall View Key Keep a and B Components Separate Piston Safety LockIsocyanate Hazard Grounding Setup ISO Disengage piston safety lock, Adjust Purge Rod 1/4 Turn Adjust Flat CeramTip Daily Shutdown Follow Pressure Relief Procedure,Shutdown Shutdown for More than a Day Pressure Relief Procedure Optional Configurations Optional Fluid Manifold Position Fluid Hoses Follow Pressure Relief Procedure, page 18. AlsoOptional Hose Position Air Hose Maintenance Clean Muffler Clean Outside of GunClean Air Cap Clean Fluid Manifold Clean Slip-Fit Polycarballoy Mix Module Cleaning Component a ISO Ports Impingement Port Cleanout Drill Sizes Impingement Port Drill Counterbore Drill XF1313 #81 Cleanout Drill Sizes for Round CeramTips Clean CeramTipExternal Quick Cleaning Method Round CeramTip Clean 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 CeramTip Disassemble 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 Valve 309856P Parts Flush Manifold Detail Part No. Description Qty Handle Standard Round Pattern Guns Slip-Fit Polycarballoy Mix Module KitsSlip-Fit Polycarballoy Mix Module Part Numbering Code Standard Flat Pattern Guns Direct Impingement Round Pattern Guns Direct Impingement Flat Pattern Guns Flat CeramTip Part Numbering Code CeramTip KitsRound CeramTip Part Numbering Code Flat CeramTips Drill Bit Kits Kit Part No Qty in Kit Drill Bit Size Illustration Nominal Gun Repair Kits Check Valve Filter Screen Kits 10 per kit Accessories Solvent Flush Pail Kit Hose Adapter KitsPour Nozzle Kit Technical Data Category Data Graco Standard Warranty Graco InformationToll Free