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Operation, Parts, Service and Repair
311320G
Model D Spray Gun
ENG
For use with non-flammable polyurethane foams. For professional use only.
Not for use in explosive atmospheres.
See page 2 for model information.
1000 psi (7 MPa, 70 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions
in this manual. Save these instructions.
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Models Contents Spray Pattern Adjustment . . . . . . . . . . . . . . . . . . . 14 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Gun Service Kits . . . . . . . . . . . . . . . . . . . . . . . . 17 Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Clean Spray Gun Procedure . . . . . .
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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. WARNING PERSONAL PROTECTIVE EQUIPMENT You must wear appropriate protectiv
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Warnings WARNING FIRE AND EXPLOSION HAZARD Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent fire and explosion: � Use equipment only in well ventilated area. � Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop cloths (potential static arc). � Keep work area free of debris, including solvent, rags and gasoline. � Do not plug or unplug power cords, or turn power or light switches on
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Overall View Overall View Major Components Spring Retainer Case Valving Rod Closure Spring Valving Rod Positioner Valving Rod Adjustment Screw Valving Rod Stop Bar Valving Rod Gun Block Piston Rod Trigger Air Cap Adjustment Valve Coupling Block Coupling Block Mounting Screw FIG. 1: Major Components 311320G 5
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Overall View Centerline Components Gun Block Mounting Screw Screen Screw O-Ring A-Iso Check Valve Closure Screw Valving Rod Assembly Seal Felt Wiper Retainer Screen Gun Block Snap Ring Mixing Chamber Case R-Resin Check Valve Screen Mounting Screw Air Cap Coupling Block Gaskets FIG. 2: Centerline Components 6 311320G
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Operation Basics Grounding Operation Basics To prevent accidental gun operation, always Check your local electrical code and propor- disconnect air supply before servicing gun or tioner manual for detailed grounding instruc- anytime gun is not in use. tions. Ground the spray guy through connection to a Isocyanate Hazard Graco-approved grounded fluid supply hose. Coupling Block Spraying materials containing isocyanates creates potentially harmful mists, vapors, and atomized particulates. Ins
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Operation Basics Manual Valves Remove Coupling Block Triggering gun with manual valves closed may cause crossover if gun ports contain residual chemical. To prevent release of pressurized chemical, close both manual valves before removing coupling block. 1. Disconnect air hose. Never open manual valves unless coupling block is secured to gun or exit port is directed 2. Close both manual valves. into flush pail. 3. Remove coupling block mounting screw (FIG. 3). 1. Open manual valves using
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Operation Basics Air Hose Connection Valving Rod Adjustment Screw To CONNECT air hoses, pull back sleeve of female fitting, insert male fitting and slide Use to regulate amount of valving rod travel sleeve forward to secure connection. when gun trigger is depressed with air supply connected. Turn clockwise to decrease travel, To DISCONNECT air hoses, pull back sleeve and counterclockwise to increase travel. of female fitting and remove male fitting. 1. Use 5/64 in. hex key wrench to loose
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Operation Basics 3. Use 5/16 in. open-end wrench to tighten Air Cap Adjustment Valve retainer another half turn. Use to control amount of air that passes through air cap and over mixing chamber tip. Airflow helps keep tip free of sprayed chemical. Too much air may distort spray pattern and create overspread. Too little air will not prop- erly clean end of valving rod. To OPEN valve, turn knob approximately 1/8 turn counterclockwise. To CLOSE valve, turn knob fully clockwise. FIG. 8: Felt
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Initial Set Up Initial Set Up 1. Remove coupling block from gun. b. Open each manual valve to allow trapped air to escape. Bleed each side 2. Check valving rod clearance in closed posi- until chemical is free of air. tion. Rod should extend approximately 1/32 in. (1 mm) beyond tip of mixing chamber. If c. Close both manual valves. it does not, see Valving Rod Adjustment procedure, page 21. 9. Use clean cloth soaked in gun cleaner to wipe clean coupling block and its mating 1/32 in. surfac
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Daily Start-Up Daily Start-Up Daily Shutdown Ensure gun is attached to coupling block and air hose, and the proportioning unit is at Follow when gun is out of service for any desired temperature and pressure. length of time. Daily disassembly of gun for cleaning is not recommended if it has been operating properly. However, if you remove 1. Connect air supply to gun, page 9. the gun from the coupling block, flush and 2. Adjust air cap valve, page 10. clean thoroughly. 3. Saturate felt i
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Pressure Relief Procedure Pressure Relief Procedure Relieve pressure before cleaning or repairing gun. 1. Close both manual valves. Manual Valves 2. Trigger gun once onto waste area to relieve fluid pressure in front end of gun. 3. Disconnect gun air supply, page 9. 4. If gun is removed from coupling block, fol- low Clean Spray Gun Procedure, page 18. If fluid in hose and proportioner is still under pressure, follow Pressure Relief Procedure in proportioner manual To relieve pressure in hose
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Spray Pattern Adjustment Spray Pattern Adjustment This adjustment may create a large mass “bun” of urethane foam. Very high tempera- tures created by chemical reaction inside a bun may not dissipate after outside surface has cooled. A large bun may continue to react for several hours after spraying until flash (burning) point of foam is reached. ALWAYS break buns into smaller pieces so heat can escape. 1. Check valving rod clearance in closed posi- from retainer case by 1/4-turn incre- t
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Spray Pattern Adjustment tern opens as adjustment is made (FIG. 12). FIG. 14: Split Pattern FIG. 12: Opening Spray Pattern b. If full-round pattern cannot be achieved, ensure that material temperature and 5. Fine tune spray pattern: spray pressure are correct. If pattern a. After you back out adjustment screw, remains closed upon reaching maxi- make fine adjustments (1/8 turns or less mum specified number of turns out from in either direction as required) to obtain point of valving, mate
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Spray Pattern Adjustment e. If buildup recurs shortly after cleaning � Check hose temperature setting. tip, remove air cap and ensure inside is � Check primary heater temperature setting. clean. � Ensure spray pressures between chemi- Reinstall air cap and ensure airflow is properly cals are balanced. If they are not, refer to set. Troubleshooting section of Proportioning Unit Operation Manual for the proportioner If no buildup occurred on air cap, check the fol- in use. lowing items in th
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Maintenance Maintenance 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. FIG. 16: 3-Gallon Gun Service Kit For more information about the 3-Gallon Gun Service Kit, see manual 311341. FIG. 15: 1-Quart Gun Service Kit For more information about the 1-Quart Gun Service Kit, see manual 311340. 311320G 17
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Maintenance 12.Clean screens, check valves and screen Clean Spray Gun Procedure screw. See Filter Screw Removal and Ser- vice procedure, page 19. Inspect air cap, mixing chamber, and gun block for build up of material and clean as Thoroughly flush gun block with gun cleaner required. before removing valving rod or mixing compo- nents from gun block. Also allow chemicals in Do not use metal cleaning devices to clean spray gun to cool before cleaning. plastic components. This procedure make
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Repair Repair Shut down proportioner and allow chemicals to cool before performing any repair proce- dures. Clean Center Line Components using Gun Service Kit prior to performing any repair pro- cedures. 4. Clean and inspect screen cavity. If particles Filter Screen Removal and are visible, remove with cleanout drills and Service flush thoroughly with gun cleaner. 1. Perform Pressure Relief Procedure (page CAUTION 13) and Clean Spray Gun Procedure, page Any remaining material in cavity on
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Repair 7. Flush injection slots. With valving rod in Clean Injection Slots open position, flush each injection slot with 1. Perform Pressure Relief Procedure (page gun cleaner. Press flush can needle firmly 13) and Clean Spray Gun Procedure, page into cleanout hole to create seal. Continue 18. until gun cleaner sprays out chamber tip. 2. Remove check valves. 8. Inspect and clean check valves, page 22. 9. Install tall hexhead check valve on Isocya- A-Iso Check Valve nate side, and short hexh
