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Graco GX-8 Operation, Parts, Service, Repair

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. 3500 psi (24 mpa, 240 bar) maximum working pressure 125 psi (9
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Operation, Parts, Service, Repair
GX-8P Spray Gun
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.
3500 psi (24 MPa, 240 bar) Maximum Working Pressure
125 psi (90 KPa, 9 bar) Maximum Air Working Pressure
Important Safety Instructions
Read all warnings and instructions
in this manual. Save these instructions.
GX-8 Model 297898
GX-8P Auto Model 297860
311338N
EN

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  • Page 1 3500 psi (24 MPa, 240 bar) Maximum Working Pressure 125 psi (90 KPa, 9 bar) Maximum Air Working Pressure Important Safety Instructions Read all warnings and instructions in this manual. Save these instructions. GX-8P Auto Model 297860 GX-8 Model 297898...

  • Page 2: Table Of Contents

    Graco Standard Warranty ....42 Graco Information ......42...

  • Page 3: Warnings

    Warnings Warnings The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclama- tion point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and warnings not covered in this section may appear throughout the body of this manual where applicable.
  • 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 information. • Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces. •...

  • 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 Spraying or dispensing fluids that contain isocya- fluid lines which could cause serious injury or dam- nates creates potentially harmful mists, vapors, and age equipment.

  • 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 system. Changing Materials NOTICE Changing the material types used in your equipment requires special attention to avoid equipment damage...

  • Page 8: Overall View

    Overall View Overall View Gun Block Mounting Screw Safety Stop Air Cap Air Cap Air Adjustment Valve Gun Block Manual Valves Trigger Coupling . 1: GX-8P Overall View Block Centerline Components B-Screen Screw O-Ring Jam Nut Screen Screen Valving Rod Retainer Pattern Control Assembly...

  • Page 9: Mixing Module

    Overall View Mixing Module Graco offers a variety of spray tip configurations to meet most applications that spray fast-reaction chemical sys- tems at low outputs. GX-8P spray tip components con- sist of a Pattern Control Disc (PCD) and a Mixing Module (Figure 3).

  • Page 10: Operation Basics

    Check your local electrical code and proportioner man- ual for detailed grounding instructions. Ground spray gun through connection to . 5: Safety Stop - Disengaged Graco-approved grounded fluid supply hose. Air Hose Connection Safety Position GX-8P guns have a two-position safety stop. When engaged, it prevents accidental triggering of gun during servicing or down time.

  • Page 11: Coupling Block

    Operation Basics Coupling Block Close Manual Valves Use 5/16 in. nut driver to turn manual valve fully clock- Chemical hoses are joined to gun block by a coupling wise. block to ease installation and removal of gun. Manual Valves Two manual valves located on coupling block control To prevent accidental gun operation, always set flow of each chemical component to gun.

  • Page 12: Air Inlet Configuration

    Operation Basics Air Inlet Configuration Fit coupling block into gun block and insert coupling block mounting screw. Use 5/16 in. nut driver to tighten to gun block. There are two configurations for the air inlet. In the stan- dard configuration, the air inlet is at base of handle. In the alternate configuration, the air inlet is at rear of gun.

  • Page 13: Mixing Module And Pcd Installation

    Operation Basics Mixing Module and PCD Installation 1. Loosen air cap by hand and remove. 2. Install mixing module: a. Disconnect gun from coupling block. b. Connect air supply to gun. c. Set safety stop to OPEN. d. Hold down trigger and place module over tip of valving rod.

  • Page 14: Valving Rod Adjustment

    Operation Basics Valving Rod Adjustment 4. Use 3/8 in. wrench on hex-shaped valving rod shank and 1/2 in. wrench on jam nut to loosen and back it away from valving rod by 3 or 4 full turns. Valving rod should not require adjustment if it was Then move valving rod toward gun cylinder.

  • Page 15: Initial Set Up

    Operation Basics Initial Set Up 6. Bleed air from chemical hoses: a. Hold coupling block with exit ports pointed into waste container. b. Use 5/16 in. nut driver to open each manual valve; this allows any trapped air to escape. 1.

  • Page 16: 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 desired temperature NOTE: Follow daily shutdown procedure when gun is and pressure. Properly ground equipment to avoid out of service for any length of time, or for mid- or static sparking that may result in fire or explosion.

  • Page 17: Pressure Relief Procedure

    Pressure Relief Procedure Pressure Relief 4. Release gun trigger, CLOSE safety stop, and close manual valves. Procedure If fluid in hose and proportioner is still under pressure, follow Pressure Relief Procedure in proportioner man- Relieve pressure before cleaning or repairing gun. To relieve pressure in hose after gun is removed, place fluid manifold over containers, facing away from you.

  • Page 18: Maintenance

    Maintenance Maintenance Gun Service Kits Use either 1-Quart Gun Service Kit (296980) or 3-Gallon Gun Service Kit (296981) to perform daily flushing of spray gun without disassembly. . 15: 3-Gallon Gun Service Kit For more information about 3-Gallon Gun Service Kit, see Manual 311341.

  • Page 19: Clean Spray Gun Procedure

    Maintenance Clean Spray Gun Procedure 10. Clean screens, check valves and screen screw (see Service Screen Screw, page 20. NOTE: Inspect air cap, PCD, mixing module, and gun block for build up of material and clean as required. To avoid static sparking that may result in fire or explo- Do not use metal cleaning devices to clean plastic com- sion, ensure all equipment in cleaning procedure is ponents.

  • Page 20: Repair

    Repair Repair Remove Check Valve Shutdown proportioner and allow chemicals to cool To avoid static sparking that may result in fire or explo- before servicing gun. sion, ensure all equipment in flushing procedure is grounded. Do not flush on or near foamed or coated surfaces.

  • Page 21: Remove Centerline Components

    Repair Remove Centerline a. Use 3/8 in. wrench on hex-shaped valving rod shank and a 1/2 in. wrench on jam nut to loosen Components it and back it away from valving rod shank by 3 or 4 full turns. Refer to page 8 for diagrams of centerline components for all gun models.

  • Page 22: Replace End Cap And Air Piston Assembly

    Repair Replace End Cap and Air 8. Install PCD retainer: Piston Assembly a. With gun trigger depressed, thread PCD retainer in place by hand. #8 Socket Head End Cap End Cap/Safety Cap Screw b. Use 10 in. adjustable wrench to carefully tighten O-Ring Stop Assembly PCD retainer until it is snug enough to ensure...
  • Page 23 Repair 5. OPEN safety stop. a. Use 5/64 in. hex key to remove two set screws from knob. 6. Use 9/64 in. ball point hex key to remove socket b. Slide knob off stop pin and retain stop pin head cap screw that holds air cylinder to handle spring.

  • Page 24: Replace Trigger Valve O-Rings

    Repair Disconnect air supply from gun. Refer to Parts, page 27. 1/16 in. Pipe Plug Retaining ring must seat completely into groove to secure end cap in place when air cylinder is pressur- ized. Keep clear of cap when air pressure is applied or Spring gun is triggered after reassembly.

  • Page 25: Clean Mixing Module

    Repair 9. Use pin punch and hammer to gently tap spring seat 5. Turn PCD retainer counterclockwise and remove. until it and valve liner push out opposite end of hole. 6. Remove PCD from mixing module retainer. 10. Remove rings on liner. Apply thin coat of Lubriplate NOTE: To remove PCD that is stuck, set safety stop to grease to new rings and install.

  • Page 26: Troubleshooting

    Troubleshooting Troubleshooting Follow Pressure Relief Procedure, page 17, before checking or repairing gun. Use the following table to check all possible problems NOTICE and causes before disassembling gun. See Mainte- To prevent cross-contamination of the equipment’s wet- nance on page 18 for referenced procedures. ted parts, never interchange component A (isocyanate) and component B (resin) parts.

  • Page 27: Parts

    Parts Parts GX-8 Gun Final Assembly (297898) 1, 25 311338N...
  • Page 28 Parts GX-8 Gun Final Assembly (297898) Ref. Part Description Qty. 15B772 HOSE, air, 1/4 in. x 23 in. (F x F) 296128 GASKET, block, gasket 295623 VALVE, check, A 295624 VALVE, check, B 295596 PLUG, coupler 208536 Coupler, line, air...

  • Page 29: Handle Assembly (297702)

    Parts GX-8 Handle Assembly (297702) 311338N...
  • Page 30 Parts GX-8 Handle Assembly (297702) GX-8 Gun Kit (297832) Ref. Part Description Qty. 295435 SEAL, u-cup 295709 SCREW, cap, socket head 295662 PLUG, pipe 295732 SCREW, cap, sh, 8-32 x 1/4 103337 PACKING, ring 106555 PACKING, ring C02032 NUT 296627...

  • Page 31: Gx-8P Spray Gun Final Assembly (297860)

    Parts GX-8P Spray Gun Final Assembly (297860) . 21: GX-8P Spray Gun Final Assembly 311338N...
  • Page 32 Parts GX-8P Spray Gun Final Assembly (297860) Ref. Part Description Qty. 15B772 HOSE, air, 1/4 X 23 in. (F X F) 296128 GASKET, block, gasket 295623 VALVE, check, A 295624 VALVE, check, B 295596 PLUG, coupler 208536 COUPLER, line, air 191872 FITTING, pipe, hex 106560...

  • Page 33: Gx-8P Auto Cylinder Assembly (297861)

    Parts GX-8P Auto Cylinder Assembly (297861) . 22: GX-8P Auto Cylinder Assembly 311338N...
  • Page 34 Parts GX-8P Auto Cylinder (297861) Ref. Part Description Qty. 26 295435 SEAL, u-cup 27 295709 SCREW, cap, socket head 28 295732 SCREW, cap, sh, 8-32 X 1/4 LG 29 104376 SCREW, cap, sch 30 297743 TIE, cable, #6 31 C20988 PACKING, o-ring 32 103337 PACKING, o-ring...

  • Page 35: Auto Gx-8P Optional Parts

    Parts Auto GX-8P Optional Parts 2,3,4 2,3,4 Ref. Part Description Qty. 297899 KIT, auto, GX-8 Gun 298752 WIRE, 10 ft, extension har- ness 298753 WIRE, 25 ft, extension har- ness 298754 WIRE, 50 ft, extension har- ness 298611 ENCODER, assembly...

  • Page 36: Coupling Block Assembly (295383)

    Parts Coupling Block Assembly (295383) Ref. Part Description 295662 Pipe plug, flush seal, 1/8 in. 117634 B-swivel fitting 117635 A-swivel fitting 295693 Pipe plug, flush seal, 1/16 in. 296970 Manual valve assembly 296215 Coupling block 311338N...

  • Page 37: Coupling Block (297902)

    Parts Coupling Block (297902) Ref. Part Description Qty. 295662 PLUG, pipe 296626 VALVE, assembly, manual 260810 Block, coupling 311338N...

  • Page 38: Coupling Block Assembly (24N996)

    Parts Coupling Block Assembly (24N996) Apply pipe sealant to all male threads prior to assembly. Torque fittings to ti19795a 120-130 in-lb (14-15 N•m) Ref. Part Description Qty. 301 296215 BLOCK, coupling, ss 302 296970 VALVE, manual 303 104071 PLUG, pipe 304 112307 FITTING, street elbow 305 C20895...

  • Page 39: Set-Up Chart For Gx-8P Modules

    Set-up Chart for GX-8P Modules Set-up Chart for GX-8P Modules Pres- Pattern Resin sure Output Module Part Port Iso Port Dia. (psi) (lbs/min) (inches) Size Orifices Size Orifices Round Spray Pattern 2500 295377 .013 .013 295339 (020) 2500 295377 .013 .013 295428 (024) Fan Spray Pattern...

  • Page 40: Technical Data

    Technical Data Technical Data Category Data Air Supply 100-125 psi (7-9 bars) Maximum Operating Pressure 3500 psi (24 MPa, 240 bar) Maximum Output  0.4 gallons/min. (1.52 liters/min.) Minimum Output  0.1 gallons/min. (0.38 liters/min.) Maximum sound pressure*† 78.7 db(A) 100 psi (0.7 MPa, 7 bar) Maximum sound power**†...
  • Page 41 Technical Data 311338N...

  • Page 42: 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.

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