Graco 311321M User Manual

Operation, Parts, Service, RepairGX-7A™, GX-7® DI, and GX-7 400Spray GunsFor use with non-flammable polyurethane foams, two-component coating systems

Overall View 10 311321MMixing ModuleAll gun models employ the concept of impinge-ment mixing through the use of a single-part MIXING MODULE. This syst

Operation Basics311321M 11Operation BasicsIsocyanate HazardKeep A and B Components SeparateGroundingCheck your local electrical code and propor-tioner

Operation Basics 12 311321MDisengage Safety StopTo disengage safety stop, push in and turn safety stop counterclockwise to place gun in OPEN position

Operation Basics311321M 13Coupling BlockChemical hoses are joined to gun block by coupling block to ease installation and removal of gun.Manual Valves

Operation Basics 14 311321M3. Insert coupling block mounting screw and use 5/16 in. nut driver to tighten to gun block.FIG. 15: Install Coupling Block

Operation Basics311321M 15Mixing Module and PCD Installation1. Install mixing module:a. Disconnect gun from coupling block.b. Connect air supply to gu

Operation Basics 16 311321MValving Rod AdjustmentGX-7A and GX-7 400 Models Only1. Push in rear stop to SERVICE position.2. If attached, turn both manu

Operation Basics311321M 17Initial Set Up1. Install female quick disconnect fitting to air supply hose bundled with chemical supply hoses.2. Connect co

Operation Basics 18 311321MDaily Start-up1. Connect air supply to gun.2. Adjust air cap adjustment valve. Turn knob counterclockwise to open valve and

Pressure Relief Procedure311321M 19Pressure Relief Procedure1. Close both manual valves.FIG. 19: Close Manual Valves2. Set safety stop to OPEN.3. Trig

Models 2 311321MContentsModels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Warnings . . . . . . . . . . . . . . . . .

Maintenance 20 311321MMaintenanceUse supplied tool kit 296835. See Tool Kit, page 48.Gun Service KitsUse either the 1-Quart Gun Service Kit (296980) o

Maintenance311321M 213. Remove gun from coupling block.4. Attach service block of gun service kit to spray gun, and then tighten using 5/16 in. nut dr

Repair 22 311321MRepairService Screen Screw1. Flush gun according to Clean Spray Gun Procedure, page 20.2. Unthread screen screw from gun block.3. Rem

Repair311321M 2311.Remove valving rod.FIG. 24: Remove Valving Rod (GX-7 DI model)FIG. 25: Remove Valving Rod (GX-7A and GX-7 400 models)a. Depress tri

Repair 24 311321MInstall Centerline ComponentsGX-7 DI Model OnlyBefore installation, ensure all gun components are clean and dry. Lubricate all moving

Repair311321M 25Replace End Cap and Air Piston AssemblyFIG. 26: GX-7 DI End Cap and Air Piston Assembly1. Clean gun according to Clean Spray Gun Proce

Repair 26 311321MReplace Trigger Valve O-Rings1. Clean gun according to Clean Spray Gun Procedure, page 20.2. Disconnect air supply from gun.FIG. 27:

Repair311321M 27Clean Mixing Module1. Flush gun according to Clean Spray Gun Procedure, page 20.2. Connect air supply to gun. Set safety stop to OPEN.

Repair 28 311321MInstall Mixing Module1. Install safety stop; leave in OPEN position.2. Connect air supply to gun.3. Depress gun trigger and slide mix

Repair311321M 29Clean Pattern Control Disc1. Set safety stop to CLOSED (SERVICE).2. Close both manual valves.3. Turn off air to air cap.4. Use cotton

Warnings311321M 3WarningsThe following general warnings are for the setup, use, grounding, maintenance, and repair of this equipment. Additional, more

Parts 30 311321MPartsGX-7A Model Final AssemblyPart Numbers 295542, 295543, 295544, 295545RA2, 263465789101112131415161718192178922252324120

Parts311321M 31GX-7A Model Final AssemblyPart Numbers 295542, 295543, 295544, 295545Ref. No. Part No. Description Qty.1 295810 Spray gun handle 12 15B

Parts 32 311321MGX-7 DI Model Final Assembly (295541)56782, 2134101213141516671718199111

Parts311321M 33GX-7 DI Model Final Assembly (295541)Ref. No. Part No. Description Qty.1 295809 Spray gun handle assembly 12 15B772 Air hose, 1/4 in. x

Parts 34 311321MGX-7 400 Model Final Assembly (295540)R A 7111296141516818211920213431, 2410129652223

Parts311321M 35GX-7 400 Model Final Assembly (295540)Ref. No. Part No. Description Qty.1 15B772 Air hose 12 296128 Coupling block gasket(pack of 2)-3

Parts 36 311321MGX-7A Model Handle Assembly (24K734)638227718912 143727154101136161934321728424139403811354324262835272120233033

Parts311321M 37GX-7 Model Handle Assembly (24K734)† Parts included in Handle Seal Rebuild Kit 296895 (purchase separately).❄ Parts included in Trigger

Parts 38 311321MGX-7 DI Model Handle Assembly (295809)251091812172341119132014343401522312429163037827393633121267383052843262335

Parts311321M 39GX-7 DI Model Handle Assembly (295809)† Parts included in Air Cylinder Rebuild Kit 296895 (purchase separately).❄ Parts included in Tri

Warnings 4 311321MFIRE AND EXPLOSION HAZARD Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent fire

Parts 40 311321MGX-7 400 Model Handle Assembly (24K733)125 PSI MAX 15141732316251821233940383111332102430192029282654738221371243533463627913

Parts311321M 41GX-7 400 Model Handle Assembly (24K733)† Parts included in Air Cylinder Rebuild Kit 296895 (purchase separately).❄ Parts included in Tr

Parts 42 311321MCoupling Block Assembly (295383) All models1516342Ref. No. Part No. DescriptionQty.1 295662 Pipe plug, flush seal, 1/8 in. 22 117634 R

Specifications311321M 43SpecificationsGX-7A Mix Module Kit† Module Kits include one mix module and both clea-nout tools. See following table.❄ Some Mo

Specifications 44 311321MSet-Up Chart for GX-7A Model❄ At 24 in. above substrate❖ At 18 in. above substratePres-sure (psi)Output (lbs/min)Pattern Dia.

Specifications311321M 45GX-7 400 Mix Module KitModule Kits Cleanout DrillPart No. Size Ref. QuantityIso PortPart No.Diameterin/(mm)Polyol PortPart No.

Specifications 46 311321MSet-up Chart for GX-7 400 Model ✖ At 24 in. above substrate❖ At 18 in. above substratePres-sure (psi)Output (lbs/min)Pattern

Specifications311321M 47GX-7 DI Model Specifications❄ Actual results may vary due to chemical system characteristics, temperature, pressure, and ratio

Specifications 48 311321MTip KitsFor GX-7A and GX-7 DI ModelsTool Kit296835GX-7A, GX-7 DI, and GX-7 400 models:Round Tip KitsPart No. Size Qty.296708

Technical Data311321M 49Technical Data❄ Theoretical: actual results will vary with operating conditionsCategory DataAir Supply 100-125 psi (0.7-0.9 MP

Warnings311321M 5PRESSURIZED ALUMINUM PARTS HAZARD Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or flu

All written and visual data contained in this document reflects the latest product information available at the time of publication. Graco reserves th

Overall View 6 311321MOverall ViewFIG. 1: GX-7A Overall ViewFIG. 2: GX-7 DI Overall View2 !Model GX-7AValving Rod Rear StopAir Cap Adjustment ValveVal

Overall View311321M 7FIG. 3: GX-7 400 Overall View!2Model GX-7 400Valving RodRear StopValving RodForward StopAir Cap ValveRear Packing NutForward Stop

Overall View 8 311321MCenterline ComponentsFIG. 4: GX-7A Centerline ComponentsFIG. 5: GX-7 DI Centerline ComponentsModel GX-7AValving RodPackingNutRea

Overall View311321M 9FIG. 6: GX-7 400 Centerline ComponentsValving RodRear Seal RetainerRear PackingRetainerRear PackingA-Screen ScrewScreen Screw Sea