Graco GX-7A Operation, Parts, Service, Repair
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Graco GX-7A Operation, Parts, Service, Repair

Graco GX-7A Operation, Parts, Service, Repair

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Operation, Parts, Service, Repair
™
GX-7A
, GX-7
Spray Guns
For use with non-flammable polyurethane foams, two-component coating systems
(polyureas), and some two-component epoxy systems. For professional use only.
See page 2 for model information.
3500 psi (24 MPa, 240 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions
in this manual. Save these instructions.
GX-7A
®
DI, and GX-7 400
GX-7 DI
311321N
GX-7 400
EN

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  • Page 1 Operation, Parts, Service, Repair ™ ® GX-7A , GX-7 DI, and GX-7 400 311321N Spray Guns For use with non-flammable polyurethane foams, two-component coating systems (polyureas), and some two-component epoxy systems. For professional use only. See page 2 for model information.

  • Page 2: Table Of Contents

    Pressure Relief Procedure ..... . . 21 Graco Information ......52 Maintenance .

  • Page 3: Warnings

    Warnings Warnings The following general warnings are for the setup, use, grounding, maintenance, and repair of this equipment. Additional, more specific warnings may be found throughout the body of this manual where applicable. Symbols appearing in the body of the manual refer to these general warnings. When these symbols appear throughout the manual, refer back to these pages for a description of the specific hazard.
  • Page 4 Graco/Gusmer replacement parts only. • Do not alter or modify equipment. • Use equipment only for its intended purpose. Call your Graco/Gusmer distributor for infor- mation. • Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot sur- faces.

  • Page 5: Important Two-Component Material Information

    Important Two-Component Material Information Important Two-Component Material Information Isocyanate Conditions Spraying or dispensing fluids that contain isocyanates creates potentially harmful mists, vapors, and atomized particulates. • Read and understand the fluid manufacturer’s warnings and Safety Data Sheet (SDS) to know specific haz- ards and precautions related to isocyanates.

  • Page 6: For All Applications Except Spray Foam

    Important Two-Component Material Information For all applications except spray Keep Components A and B foam Separate Cross-contamination can result in cured material in fluid Spraying or dispensing fluids that contain isocyanates cre- lines which could cause serious injury or damage equip- ates potentially harmful mists, vapors, and atomized partic- ment.

  • Page 7: Foam Resins With 245 Fa Blowing Agents

    Important Two-Component Material Information Foam Resins with 245 fa Blowing Agents Some foam blowing agents will froth at temperatures above 90°F (33°C) when not under pressure, especially if agitated. To reduce frothing, minimize preheating in a circulation sys- tem. Changing Materials NOTICE Changing the material types used in your equipment requires special attention to avoid equipment damage...

  • Page 8: Overall View

    Model GX-7A Forward Stop Locknut Valving Rod Rear Stop Air Cap Adjustment Valve Gun Block Valving Rod Forward Stop Rear Packing Nut Manual Valves Trigger . 1: GX-7A Overall View Model GX-7 DI . 2: GX-7 DI Overall View 311321N...
  • Page 9 Overall View Forward Stop Model GX-7 400 Locknut Valving Rod Rear Stop Gun Block Air Cap Valve Valving Rod Forward Stop Trigger Rear Packing Nut . 3: GX-7 400 Overall View 311321N...

  • Page 10: Centerline Components

    Front Packing Check Valve Assembly Pattern Control Coupling Block Disc (PCD) R-Screen Screw Gasket PCD Retainer . 4: GX-7A Centerline Components R-Screen Screw Model GX-7 DI Rear Seal Gland Screen Rear Packing Rear Seal Retainer Gun Block Assembly Check Valve...
  • Page 11 Overall View Model GX-7 400 R-Screen Screw Spring Rear Packing Rear Packing Retainer Valving Rod Screen Screw Seal Rear Seal Retainer Check Valve Check Valve Mixing Module Screen Pattern Control Disc (PCD) Gun Block PCD Retainer Air Cap Screen Screw Seal Coupling Block Gasket A-Screen Screw...

  • Page 12: Mixing Module

    Mixing Module (round or flat) PCD (round or flat) PCD (round or flat) . 9: GX-7 DI Mixing Module Valving Mixing Module (round or flat) . 7: GX-7A Mixing Module 311321N...

  • Page 13: Operation Basics

    Check your local electrical code and propor- tioner manual for detailed grounding instruc- Isocyanate Hazard tions. Ground the spray gun through connection to a Graco-approved grounded fluid supply hose. Spraying materials containing isocyanates Safety Position creates potentially harmful mists, vapors, and atomized particulates.

  • Page 14: Air Hose Connection

    Operation Basics Air Hose Connection Disengage Safety Stop To disengage safety stop, push in and turn safety stop counterclockwise to place gun in Connect Air Hoses OPEN position (red band is exposed). Pull back sleeve of female fitting, insert male fitting and slide sleeve forward to secure con- Red Band nection.

  • Page 15: Coupling Block

    Operation Basics Coupling Block Close Manual Valves Use 5/16 in. nut driver to turn manual valve Chemical hoses are joined to gun block by fully clockwise. coupling block to ease installation and removal of gun. CAUTION To prevent accidental gun operation, always Manual Valves set safety stop to CLOSED (SERVICE), close both manual valves, and disconnect air...

  • Page 16: Air Inlet Configuration

    Operation Basics 3. Insert coupling block mounting screw and Optional Configuration use 5/16 in. nut driver to tighten to gun Refer to page 44. If bottom-mount hose con- block. nection is desired, alternate swivel fitting (2 and 3) with pipe plugs (1). Use pipe thread sealant.

  • Page 17: Mixing Module And Pcd Installation

    Operation Basics Mixing Module and PCD f. Use wrench to loosen piston locknut. Turn valving rod rearward as far as it Installation will turn. 1. Install mixing module: g. Place and orient PCD over mixing mod- a. Disconnect gun from coupling block. ule retainer.

  • Page 18: Valving Rod Adjustment

    Operation Basics Valving Rod Adjustment GX-7A and GX-7 400 Models Only 1. Push in rear stop to SERVICE position. 2. If attached, turn both manual valves fully clockwise to close (see Manual Valves, page 15). 3. Connect air line from gun to air source to pressurize air cylinder forward to CLOSED .

  • Page 19: Initial Set Up

    Operation Basics Initial Set Up 5. Bleed air from chemical hoses. a. Use separate waste containers for A-ISO and R-Resin. 1. Install female quick disconnect fitting to air supply hose bundled with chemical supply b. Hold coupling block with exit ports hoses.

  • Page 20: Daily Start-Up

    Operation Basics Daily Start-up Daily Shutdown Ensure gun is attached to coupling block and air hose. Ensure proportioning unit is at Follow daily shutdown procedure when desired temperature and pressure. Properly gun is out of service for any length of time, ground equipment to avoid static sparking that or for mid- or end-of-day service.

  • Page 21: Pressure Relief Procedure

    Pressure Relief Procedure Pressure Relief Procedure 4. Release gun trigger, set safety stop to CLOSED, and close manual valves. Relieve pressure before cleaning or repairing gun. If fluid in hose and proportioner is still under 1. Close both manual valves. pressure, follow Pressure Relief Procedure in proportioner manual To relieve pressure in hose after gun is...

  • Page 22: Maintenance

    Maintenance Maintenance Use supplied tool kit 296835. See Tool Kit, page 50. Gun Service Kits Use either the 1-Quart Gun Service Kit (296980) or 3-Gallon Gun Service Kit (296981) to perform daily flushing of spray gun without disassembly. . 23: 3-Gallon Gun Service Kit For more information about the 3-Gallon Gun Service Kit, see Manual 311341.

  • Page 23: Flush Gun

    Maintenance Flush Gun 3. Remove gun from coupling block. 4. Attach service block of gun service kit to spray gun, and then tighten using 5/16 in. nut driver. To avoid static sparking that may result in fire or explosion, ensure all equipment in flushing 5.

  • Page 24: Repair

    Repair Repair Remove Centerline Components Shutdown proportioner and allow chemicals to Refer to F . 4 through F . 6 for diagrams of cool before servicing gun. centerline components for all gun models. Clean A and R components in separate con- 1.
  • Page 25 16. Coat threads and mating surfaces of gun block and gun block bracket with Lubriplate grease, and reassemble. 17. Inspect gun block for damage. . 25: Remove Valving Rod (GX-7A and GX-7 400 models) a. Depress trigger lever and hold. GX-7 DI model only: loosen piston stop locknut until it disengages from thread on valving rod.

  • Page 26: Install Centerline Components

    Repair Install Centerline 11. Install PCD over end of mixing module retainer. Components 12. Thread PCD retainer onto gun block. Hand GX-7 DI Model Only tight. Before installation, ensure all gun components 13. Rotate flat PCD to adjust orientation as are clean and dry.

  • Page 27: Replace End Cap And Air Piston Assembly

    Repair Replace End Cap and Air ensure “cup” faces front of air cylinder when replacing. Piston Assembly 10. By hand, pull piston assembly out of air cyl- End Cap inder and inspect o-ring for damage. Spacer Replace if necessary. Apply Lubriplate Piston Assembly grease prior to installation.

  • Page 28: Replace Trigger Valve O-Rings

    Repair Replace Trigger Valve 8. Remove rear internal pipe plug (under pipe plug). O-Rings 9. Use pin punch and hammer to gently tap 1. Clean gun according to Clean Spray Gun spring seat until it and valve liner push out Procedure, page 22.

  • Page 29: Clean Mixing Module

    3. Remove air cap by hand. buildup of mixed material from rod. GX-7A and GX-7 400 Models Only If the valving rod is replaced, reset forward Air cap and PCD retainer may be difficult stop.

  • Page 30: Install Mixing Module

    Repair Install Mixing Module 11. Slide safety stop onto rear of air cylinder. Push safety stop partially forward and 1. Install safety stop; leave in OPEN position. rotate clockwise to set to OPEN. 2. Connect air supply to gun. Module PCD Body 3.

  • Page 31: Clean Pattern Control Disc

    It is not always possible to clean all mate- rial build-up from PCD while assembled to gun. In this case, remove PCD and clean inside radius of disc. Pattern Control Disc (PCD) GX-7A Model Shown . 31: Pattern Control Disc (PCD) 311321N...

  • Page 32: Parts

    Parts Parts GX-7A Model Final Assembly Part Numbers 295542, 295543, 295544, 295545 2, 26 311321N...
  • Page 33 296724 Screen, 80 mesh (pack of 50) 296722 Check valve assembly (pack of 10) 295384 Gun block Module; see GX-7A Mix Mod- ule Kit, page 45 296976 PCD body Tip; see Tip Kits, page 50 296978 Front packing (pack of 5)

  • Page 34: Di Model Final Assembly (295541)

    Parts GX-7 DI Model Final Assembly (295541) 2, 21 311321N...
  • Page 35 Parts GX-7 DI Model Final Assembly (295541) Ref. Part Description Qty. 295809 Spray gun handle assembly 15B772 Air hose, 1/4 in. x 23 in. (FXF) 295596 Coupler plug 295597 Coupler 295835 R-screen screw 296792 Screen, 80 mesh (pack of 10) 296724 Screen, 80 mesh (pack of 50) 296713 Check valve assembly (pack of 2)

  • Page 36: 400 Model Final Assembly (295540)

    Parts GX-7 400 Model Final Assembly (295540) 1, 24 311321N...
  • Page 37 Parts GX-7 400 Model Final Assembly (295540) Ref. Part Description Qty. 15B772 Air hose 296128 Coupling block gasket (pack of 2) 295596 Coupler plug 295597 Coupler 295384 Gun block (includes 13) 296722 Check valve assembly (pack of 10) 295799 Spray gun handle assembly 16K136 Valving rod 296792 Screen-80, mesh (pack of 10) 296724 Screen-80, mesh (pack of 50)

  • Page 38: Gx-7A Model Handle Assembly (24K734)

    Parts GX-7A Model Handle Assembly (24K734) 311321N...
  • Page 39 Parts GX-7 Model Handle Assembly (24K734) † Parts included in Handle Seal Rebuild Kit Ref. Part Description Qty. 296895 (purchase separately). 296862 Spray gun handle ❄ Parts included in Trigger valve rebuild kit 295678 Cylinder end cap assembly 296897 (purchase separately). 295676 Spring 295675...

  • Page 40: Di Model Handle Assembly (295809)

    Parts GX-7 DI Model Handle Assembly (295809) 311321N...

  • Page 41: Part No. Description

    Parts GX-7 DI Model Handle Assembly (295809) Ref. Part No. Description Qty. 296862 Gun handle 295714 Cylinder end cap assembly 295715 Air cylinder 295686 Valve liner 295687 Valve spool 295688 Valve retainer nut 295689 Spring seat 295690 Cylinder clamp 295716 Stop, stroke, long 295717 Two position stop body...

  • Page 42: 400 Model Handle Assembly (24K733)

    Parts GX-7 400 Model Handle Assembly (24K733) 311321N...
  • Page 43 Parts GX-7 400 Model Handle Assembly (24K733) Ref. Part Description Qty. 106245 Cap screw, SCH 295662 Pipe plug 3†❄ 106555 Packing o-ring 4†❄ 103337 Packing o-ring 295684 Socket head cap screw 295438 Stop nut, elastic, 5-40 7†❄ 295685 O-ring 8† 295405 Needle valve, packing 295692...

  • Page 44: Coupling Block Assembly (295383)

    Parts Coupling Block Assembly (295383) All models Ref. Part Description Qty. 295662 Pipe plug, flush seal, 1/8 in. 117634 R-swivel fitting 117635 A-swivel fitting 295693 Pipe plug, flush seal, 1/16 in. 296970 Manual valve assembly 296215 Coupling block 311321N...

  • Page 45: Specifications

    Specifications Specifications GX-7A Mix Module Kit Module Kit†❄ Module Only Cleanout Tool (A) Iso Port Diameter (R) Resin Port Diameter Part No. Size Ref. Part No. Size Ref. Part No. in/(mm) Part No. in/(mm) 296909 #1 Round 296907 #1 Round 246807 .0320 (.81)

  • Page 46: Set-Up Chart For Gx-7A Model

    Specifications Set-Up Chart for GX-7A Model Pres- Pattern Polyol sure Output Dia. Module Part Port Iso Port (psi) (lbs/min) (inches) Size Orifices Size Orifices Round Spray Pattern ❄22 1000 296909 (#1) .0320 .0320 296712 ❄12 1000 296919 (#3) .0180 .0225 296710 ❄14...

  • Page 47: Gx-7 400 Mix Module Kit

    Specifications GX-7 400 Mix Module Kit Module Kits Cleanout Drill Iso Port Diameter Polyol Port Diameter Part No. Size Ref. Quantity Part No. in/(mm) Part No. in/(mm) 296885 402 Round 246816 .018 (.45) 246816 .018 (.45) 296884 296859 451 Fan 246816 .018 (.45) 246816...

  • Page 48: Set-Up Chart For Gx-7 400 Model

    Specifications Set-up Chart for GX-7 400 Model Pres- Pattern Polyol sure Output Dia. Module Part Port Iso Port (psi) (lbs/min) (inches) Size Orifices Size Orifices Round Spray Pattern ✖ 8 1500 296885 (402) .0180 .0180 296858 Fan Spray Pattern ❖ 16 x 3 1500 296859 (451) .0180...

  • Page 49: Gx-7 Di Model Specifications

    Specifications GX-7 DI Model Specifications Module/Tip Data for Chemical Sprayed at 2500 PSI ❄Output ✖ Module Kit ❄Pattern Cleanout Drill Ref. No. (lbs/min) Fan Spray Pattern 296900 (#2) 246625 12 in. wide 20 in. wide (.086 diameter) 12 in. wide 20 in.

  • Page 50: Tip Kits

    296695 213- 296883 SPEC 296696 296707 296697 296877 Tool Kit 296835 GX-7A, GX-7 DI, and GX-7 400 models: Part Description Part Description 3/32 in, 9/64 in, 5/32 in. and 3/16 in. Allen 117642 5/16 in. Hex Nut Driver Wrenches 117661...

  • Page 51: Technical Data

    Data Air Supply 100-125 psi (0.7-0.9 MPa, 6.9-8.6 bar) Maximum Operating Pressure 3500 psi (24 MPa, 240 bar) Maximum Output ❄ GX-7A Model: 40 lbs/min (18 kg/min) GX-7 DI Model: 22 lbs/min (10 kg/min) GX-7 400 Model: 8 lbs/min (3.6 kg/min) Minimum Output ❄...

  • Page 52: Graco Standard Warranty

    With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective.

This manual is also suitable for:

Gx-7 diGx-7 400

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