Graco Inc GX-7 DI, 311321H, GX-7 400 Repair, Service Screen Screw, Remove Centerline Components

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Repair

Repair

Shutdown proportioner and allow chemicals to cool before servicing gun.

Clean A and R components in separate con- tainers to avoid cross contamination.

Service Screen Screw

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

2.Unthread screen screw from gun block.

3.Remove check valve from screen screw. Clean valve with gun cleaner and inspect for damage. Replace if necessary.

4.Remove screen from screen screw. Soak in gun cleaner or replace if clogged or dirty.

5.Clean screen screw cavity. If any particles are visible, clean with clean out drills and flush with gun cleaner.

CAUTION

Any material left in cavity on downstream side of screen will clog mixing module.

6.Inspect screen screw seal for damage. Replace if necessary.

7.Reinstall screen screw in gun block. Make sure it is tight.

8.Flush gun with mixing module removed.

Remove Centerline

Components

Refer to FIG. 4 through FIG. 6 for diagrams of centerline components for all gun models.

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

2.Connect air supply to gun. Set safety stop to OPEN.

3.Remove air cap.

4.Trigger gun and hold it to relieve pressure on PCD retainer.

5.Remove PCD retainer by turning it counter- clockwise.

6.Remove PCD from mixing module retainer.

To remove PCD that is stuck, set safety

stop to OPEN, depress and release gun trigger to unseat it. Set safety stop to

CLOSED (SERVICE).

7.Remove mixing module retainer.

8.Set safety stop to OPEN. Depress and release gun trigger to unseat it. Remove mixing module off end of valving rod. Set safety stop to CLOSED (SERVICE).

CAUTION

Do not use sharp objects or metal tools to remove mixing module.

9.Loosen rear packing nut 1-2 turns.

10.Push safety stop partially forward, rotate it counterclockwise, and slide off air cylinder.

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311321H

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Contents 311321H Important Safety InstructionsGX-7 Contents ModelsPersonal Protective Equipment Fire and Explosion Hazard Pressurized Aluminum Parts Hazard Model GX-7A Overall ViewModel GX-7 DI 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 HosesCoupling Block Installation and RemovalManual Valves Optional Configuration Air Inlet ConfigurationRemove Coupling Block Mixing Module and PCD Installation Do not OvertightenGX-7A and GX-7 400 Models Only Valving Rod AdjustmentGX-7 DI Model Only Initial Set Up Daily Start-up Daily ShutdownPressure Relief Procedure Trigger GunGun Service Kits MaintenanceClean Spray Gun Procedure Flush Gun Repair Service Screen ScrewRemove Centerline Components 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 PartsNo. Part No. Description GX-7A Model Final AssemblyModule see GX-7A Mix Mod GX-7 DI Model Final Assembly Module see GX-7 DI Model Specifications , GX-7 DI Model Final AssemblyNo. Part No. Description Qty 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