Graco 311321H Operation, Parts, Service, Repair
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Graco 311321H Operation, Parts, Service, Repair

Graco 311321H Operation, Parts, Service, Repair

3500 psi (24 mpa, 240 bar) maximum working pressure
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Operation, Parts, Service, Repair
GX-7A, GX-7 DI, and GX-7 400
Spray Guns
For use with non-flammable polyurethane foams, two-component coating systems
(polyureas), and some two-component epoxy systems. For professional use only.
Not for use in explosive atmospheres.
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
GX-7 400
GX-7 DI
311321H
ENG

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Summary of Contents for Graco 311321H

  • Page 1 Not for use in explosive atmospheres. 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 GX-7 400 GX-7 DI 311321H...

  • Page 2: Table Of Contents

    GX-7 DI - 4/213 296901 (4) GX-7A - 1/90 296909 (1) GX-7A - 10/210 296906 (10) GX-7A - 3/70 296226 (3) GX-7A - 5/70 296923 (5) Includes: Mix Module 296853 (212) 296706 (213) 296712 (90) 296704 (210) 296710 (70) 296710 (70) 311321H...

  • Page 3: Warnings

    • Do not spray without tip guard and trigger guard installed. • Engage trigger lock when not spraying. • Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning, checking, or servicing equipment. 311321H WARNING Warnings...
  • Page 4 Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning, checking, or servicing equipment. • Tighten all fluid connections before operating the equipment. • Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately. WARNING 311321H...
  • Page 5 Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or fluids containing such solvents in pressurized aluminum equipment. Such use can cause serious chemical reaction and equipment rupture, and result in death, serious injury, and prop- erty damage. 311321H...

  • Page 6: Overall View

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

  • Page 8: Centerline Components

    Gun Block Pattern Control Coupling Block Disc (PCD) Gasket Coupling Block Mounting Screw A-Screen Screw Screen Screw Seal Screen Mixing Module PCD Body O-ring Air Cap PCD Retainer Rear Packing Rear Seal Retainer Assembly Check Valve Screen A-Screen Screw 311321H...
  • Page 9 Screw Seal Check Valve Mixing Module Pattern Control Disc (PCD) PCD Retainer Air Cap Coupling Block Mounting Screw . 6: GX-7 400 Centerline Components 311321H Spring Rear Packing Rear Packing Retainer Gun Block Coupling Block Gasket Overall View Valving Rod...

  • Page 10: Mixing Module

    . 7: GX-7A Mixing Module . 8: GX-7 400 Mixing Module Mixing Module (round or flat) PCD (round or flat) . 9: GX-7 DI Mixing Module Valving Rod Mixing Module (round or flat) PCD (round or flat) Valving Rod PCD (round or flat) 311321H...

  • Page 11: Operation Basics

    A compo- nent (isocyanate) and B component (resin) parts. The gun is shipped with the A side on the left. 311321H Grounding Check your local electrical code and propor- tioner manual for detailed grounding instruc- tions.

  • Page 12: Air Hose Connection

    Connect Air Hoses Pull back sleeve of female fitting, insert male fitting and slide sleeve forward to secure con- nection. Disconnect Air Hoses Pull back sleeve of female fitting and pull out male fitting. Pull Sleeve . 13: Disconnect Air Hose 311321H...

  • Page 13: Coupling Block

    Use 5/16 in. nut driver to turn manual valve counterclockwise three full turns. Coupling Block Manual Valves . 14: Open Manual Valves 311321H Close Manual Valves Use 5/16 in. nut driver to turn manual valve fully clockwise. CAUTION To prevent accidental gun operation, always...

  • Page 14: Air Inlet Configuration

    1. Remove pipe nipple. 2. Remove pipe plug from rear of gun. 3. Install pipe plug in location previously occu- pied by pipe nipple. 4. Install pipe nipple in location previously occupied by pipe plug. Pipe Plug Optional Pipe Nipple 311321H...

  • Page 15: Mixing Module And Pcd Installation

    (GX-7 model only). d. Slightly loosen rear seal retainer assembly. e. Remove safety stop. 311321H f. Use wrench to loosen piston locknut. Turn valving rod rearward as far as it will turn. g. Place and orient PCD over mixing mod- ule retainer.

  • Page 16: Valving Rod Adjustment

    6. Use 5/16 in. nut driver through rear of gun to thread valving rod forward to engage PCD. When valving rod contacts PCD tighten another 1/10 turn. 7. Carefully maintain position of valving rod and tighten locknut against piston rod. 8. Retighten rear seal retainer assembly. 311321H...

  • Page 17: Initial Set Up

    3. Close both manual valves. 4. Pressurize A and R chemical hoses. Check for leaks. See Proportioner manual. 311321H 5. Bleed air from chemical hoses. a. Use separate waste containers for A-ISO and R-Resin. b. Hold coupling block with exit ports pointed into waste container.

  • Page 18: Daily Start-Up

    See Proportioner manual. 5. Clean as required. See Clean Spray Gun Procedure, page 20. Do not disassemble gun daily for cleaning if it is operating properly. However, if gun is removed from coupling block, it must be flushed and cleaned thoroughly. 311321H...

  • Page 19: Pressure Relief Procedure

    2. Set safety stop to OPEN. 3. Trigger gun onto cardboard or into waste container to relieve pressure. . 20: Trigger Gun 311321H Pressure Relief Procedure 4. Release gun trigger, set safety stop to CLOSED, and close manual valves. If fluid in hose and proportioner is still under...

  • Page 20: Maintenance

    Also allow chemicals in spray gun to cool before cleaning. This procedures makes use of the 1-Quart or 3-Gallon Gun Service Kit. 1. Set safety stop to CLOSED (SERVICE). 311321H...

  • Page 21: Flush Gun

    13. Remove service block of gun service kit from spray gun. 14. Set safety to CLOSED (SERVICE). 15. Disconnect air supply. 311321H 16. Clean screens, check valves and screen screw as required. See Service Screen Screw, page 22. Inspect air cap, PCD, mixing module, and gun block for build up of material and clean as required.

  • Page 22: Repair

    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. 311321H...
  • Page 23 15. Clean all components thoroughly. Use brushes and clean-out tools to remove 311321H residual chemical from metal components. Use cotton swabs soaked in gun cleaner to clean plastic components. 16. Coat threads and mating surfaces of gun block and gun block bracket with Lubriplate grease, and reassemble.

  • Page 24: Install Centerline Components

    Adjustment, page 16. 15. Thread air cap into place; hand tight. 16. Slide safety stop onto rear of air cylinder. Push safety stop partially forward and rotate clockwise to set to OPEN. 17. Set safety stop to CLOSED (SERVICE). 311321H...

  • Page 25: Replace End Cap And Air Piston Assembly

    Lubriplate grease. 9. Inspect rear U-cup seal or o-ring for dam- age. Replace if necessary. If removed, 311321H ensure “cup” faces front of air cylinder when replacing. 10. By hand, pull piston assembly out of air cyl- inder and inspect o-ring for damage.

  • Page 26: Replace Trigger Valve O-Rings

    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. 311321H...

  • Page 27: Clean Mixing Module

    7. Remove mixing module retainer. 8. Set safety stop to OPEN. Depress and release gun trigger to unseat it. Remove 311321H mixing module from end of valving rod. Set safety stop to CLOSED (SERVICE). 9. Inspect valving rod for damage and replace as required.

  • Page 28: Install Mixing Module

    11. Slide safety stop onto rear of air cylinder. Push safety stop partially forward and rotate clockwise to set to OPEN. Module PCD Body Front Packing Retainer O-Ring PCD Retainer . 29: Install Mixing Module Note orientation of fan tip Air Cap 311321H...

  • Page 29: 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. GX-7A Model Shown . 30: Pattern Control Disc (PCD) 311321H Pattern Control Disc (PCD) Repair...

  • Page 30: Parts

    Parts Parts GX-7A Model Final Assembly Part Numbers 295542, 295543, 295544, 29545 2, 26 311321H...
  • Page 31 (pack of 2) 296833 A-gun block screen screw assembly (includes 6, 8, 9, 21) A-gun block screen screw 296828 Rear packing retainer 296829 Rear seal packing (pack of 5) 296830 Rear seal retainer 296692 Valving rod 100030 Fitting 311321H Qty. Parts...

  • Page 32: Di Model Final Assembly (295541)

    Parts GX-7 DI Model Final Assembly (295541) 2, 21 311321H...
  • Page 33 295433 Coupling block mounting screw 296979 Coupling block mounting screw (pack of 2) 295834 A-screen screw 295836 Rear seal gland 296864 Rear seal retainer assembly 296829 Rear seal packing (pack of 5) 295383 Coupling block (not shown) 100030 Fitting 311321H Qty. Parts...

  • Page 34: 400 Model Final Assembly (295540)

    Parts GX-7 400 Model Final Assembly (295540) 1, 24 311321H...
  • Page 35 Module Kit, page 45 296836 Retainer 296837 Air cap Tip; see Tip Kits, page 48 296833 A-gun block screen screw assembly (includes 6, 9, 10, 12) 296834 R-gun block screen screw assembly (includes 6, 9, 10, 12) 100030 Fitting 311321H Qty. Parts...

  • Page 36: Gx-7A Model Handle Assembly (295810)

    Parts GX-7A Model Handle Assembly (295810) 311321H...
  • Page 37 (optional) 295690 Cylinder clamp C20003 Socket head cap screw, 10-32 x 1/2 43† 295685 O-ring 311321H † Parts included in Handle Seal Rebuild Kit Qty. 296895 (purchase separately). ❄ Parts included in Trigger valve rebuild kit 296897 (purchase separately). Parts...

  • Page 38: Di Model Handle Assembly (295809)

    Parts GX-7 DI Model Handle Assembly (295809) 311321H...
  • Page 39 10-32 x 1/2 38❄ 295442 Spring 103656 Hex nipple (optional), 1/8 40† 103338 O-ring, fluoroelastomer † Parts included in Air Cylinder Rebuild Kit 296895 (purchase separately). 311321H ❄ Parts included in Trigger Valve Rebuild Kit 296897 (purchase separately). Qty. Parts...

  • Page 40: 400 Model Handle Assembly (295799)

    Parts GX-7 400 Model Handle Assembly (295799) 311321H...
  • Page 41 Valve spool 295688 Retainer valve nut 295689 Spring seat 296862 Gun handle 39† 295706 O-ring 295708 Spacer † Parts included in Air Cylinder Rebuild Kit 296895 (purchase separately). ❄ Parts included in Trigger Valve Rebuild Kit 296897(purchase separately). 311321H Qty. Parts...

  • Page 42: Part No. Description

    Parts Coupling Block Assembly (295383) All models Ref. No. Part No. Description 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 311321H...

  • Page 43: Specifications

    296872 A10 Pour 296873 A20 Pour 296874 A2 Pour 296911 STD Blank 296912 STD Blank 296913 PEEK Blank 311321H Module Only (A) Iso Port Size Ref. Part No. #1 Round 246807 #2 Round 246816 #3 Round 276984 #4 Round 296290...

  • Page 44: Set-Up Chart For Gx-7A Model

    296876 (A3) .0390 Fan Spray Pattern 296925 (#7) .0280 296906 .0360 (#10) 296910 .0210 (#12) Iso Port Size Orifices .0320 296712 .0225 296710 .0225 296710 .0320 296694 .0350 296695 .0180 296697 .0390 296697 .0280 296704 .0360 296703 .0210 296705 311321H...

  • Page 45: Gx-7 400 Mix Module Kit

    Each module kit includes cleanout drills. To avoid damage to module, use correct clea- nout drill. Module Only Part No. Size Ref. 296316 451 Fan 295379 453 Fan 311321H Iso Port Diameter Quantity Part No. 246816 .018 (.45) 246816 .018 (.45) 246631 .020 (.51)

  • Page 46: Set-Up Chart For Gx-7 400 Model

    214 Fan 296892 Polyol Module Part Port Size Orifices Round Spray Pattern 296885 (402) .0180 Fan Spray Pattern 296859 (451) .0180 296888 (452) .0200 296891 (453) .0225 Quantity Iso Port Size Orifices .0180 296858 .0180 296853 .0200 296853 .0250 296855 311321H...

  • Page 47: Gx-7 Di Model Specifications

    Size Ref. 296898 PEEK 018/018 PEEK 028/028 296899 Module Only Part No. Size Ref. 296902 311321H Ref. No. Fan Spray Pattern 12 in. wide 20 in. wide 12 in. wide 20 in. wide 10 in. wide 24 in. wide 18 in. wide 11 in.

  • Page 48: Tip Kits

    296696 296697 296877 Tool Kits GX-7A and GX-7 DI models: 296835 GX-7 400 model: 296184 Flat Tip Kits Part 296698 296699 296700 296701 296702 296703 296704 296715 296882 296705 296716 296706 296883 296707 Ref. Qty. 212.5 SPEC 213- SPEC 311321H...

  • Page 49: Technical Data

    Maximum Output ❄ Minimum Output ❄ Height Length Width Weight Mixing ❄ Theoretical: actual results will vary with operating conditions 311321H Data 100-125 psi (7.9 bars) 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)

  • Page 50: Graco Standard Warranty

    Graco Standard Warranty Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale to the original purchaser for use. 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 400Gx-7 diGx-7a295540295541295542 ... Show all

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