Graco Inc GX-7 DI, 311321H, GX-7 400, GX-7A Replace Trigger Valve O-Rings

Page 26

Repair

Replace Trigger Valve O-Rings

1.Clean gun according to Clean Spray Gun Procedure, page 20.

2.Disconnect air supply from gun.

Refer to Parts, page 30.

FIG. 26: Replace Trigger Valve O-Ring

3.Remove mounting screw and locknut that hold trigger in place. Remove trigger.

4.Remove valve retainer nut.

5.Pull out valve spool and valve spring. Remove old o-rings.

6.Prior to installation, liberally lubricate all o-rings with lubricant provided in Rebuild kit.

Follow steps 7-15 to replace o-rings on

valve liner. If o-rings do not need to be replaced, go to step 16.

7. Remove pipe plug from rear of gun handle.

For guns configured with air inlet at rear of gun handle, pipe nipple replaces pipe plug. Remove pipe nipple.

8.Remove rear internal pipe plug (under pipe plug).

9.Use pin punch and hammer to gently tap spring seat until it and valve liner push out opposite end of hole.

10.Remove 4 o-rings on liner.

11.Apply thick coat of Lubriplate grease to new o-rings and install.

12.Clean valve hole. Remove any dirt and debris. Apply thick coat of Lubriplate grease to inside of valve hole.

13.Slide spring seat into gun handle air valve hole, tapered end first, until it bottoms out.

14.Push valve liner in as far as it will go. Tem- porarily screw in valve retainer nut, which aligns valve liner and valve spool. Remove valve retainer nut.

15.With valve spool spring in place, insert valve spool into valve liner. Screw in valve retainer nut. Do not overtighten.

16.Apply small amount of pipe thread sealant to 1/16 in. pipe plug threads. Screw pipe plug in place.

17.Apply small amount of pipe thread sealant to 1/8 in. pipe plug (or 1/8 in. pipe nipple) and install.

18.Reinstall trigger using screw and locknut.

26

311321H

Image 26

Contents GX-7 Important Safety Instructions311321H Contents ModelsPersonal Protective Equipment Fire and Explosion Hazard Pressurized Aluminum Parts Hazard Model GX-7 DI Overall ViewModel GX-7A Valving Rod Rear Stop Gun Block Air Cap Valve Model GX-7Locknut TriggerCenterline Components GX-7A Centerline ComponentsGX-7 400 Centerline Components Mixing Module GX-7A Mixing ModuleIsocyanate Hazard Safety PositionOperation Basics Keep a and B Components SeparateConnect Air Hoses Disengage Safety StopAir Hose Connection Disconnect Air HosesManual Valves Installation and RemovalCoupling Block Remove Coupling Block Air Inlet ConfigurationOptional Configuration Mixing Module and PCD Installation Do not OvertightenGX-7 DI Model Only Valving Rod AdjustmentGX-7A and GX-7 400 Models Only Initial Set Up Daily Start-up Daily ShutdownPressure Relief Procedure Trigger GunClean Spray Gun Procedure MaintenanceGun Service Kits Flush Gun Remove Centerline Components Service Screen ScrewRepair Remove valving rod. Rod Draw Bar Valving Rod Install Centerline Components Replace End Cap and Air Piston Assembly GX-7 DI ShownReplace Trigger Valve O-Rings Replace Trigger Valve O-RingClean Mixing Module Unthread Cap from PCD BodyInstall Mixing Module Install Mixing ModuleClean Pattern Control Disc GX-7A Model ShownGX-7A Model Final Assembly PartsModule see GX-7A Mix Mod GX-7A Model Final AssemblyNo. Part No. Description GX-7 DI Model Final Assembly No. Part No. Description Qty GX-7 DI Model Final AssemblyModule see GX-7 DI Model Specifications , GX-7 400 Model Final Assembly GX-7 400 Model Final Assembly Module Kit ,GX-7A Model Handle Assembly GX-7 Model Handle Assembly DescriptionGX-7 DI Model Handle Assembly GX-7 DI Model Handle Assembly Description QtyGX-7 400 Model Handle Assembly GX-7 400 Model Handle Assembly Coupling Block Assembly All modelsSpecifications GX-7A Mix Module KitSet-Up Chart for GX-7A Model TipQuantity In/mm Module Kits Cleanout Drill Iso PortGX-7 400 Mix Module Kit Module Only Size RefSet-up Chart for GX-7 400 Model Tip Kits for GX-7 400 Gun No. Ref QuantityPattern Lbs/min GX-7 DI Model SpecificationsModule/Tip Data for Chemical Sprayed at 2500 PSI Output Round Spray PatternFor GX-7A and GX-7 DI Models Tip KitsTool Kits Round Tip Kits Size QuantityTechnical Data Category DataGraco Standard Warranty