Operation, Parts, Service and Repair Model D Spray Gun 311320G 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.
Models Contents Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Major Components . . . . . . . . . . . . . . . . . . . . . . . 5 Centerline Components . . . . . . . . . . . . . . . . . . . 6 Operation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . .
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.
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.
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.
Overall View Centerline Components Gun Block Mounting Screw Screen Screw O-Ring Closure Screw Valving Rod Assembly A-Iso Check Valve Seal Felt Wiper Retainer Gun Block R-Resin Check Valve Screen Mounting Screw Screen Snap Ring Mixing Chamber Case Air Cap Coupling Block Gaskets FIG.
Operation Basics Operation Basics To prevent accidental gun operation, always disconnect air supply before servicing gun or anytime gun is not in use. Isocyanate Hazard Spraying materials containing isocyanates creates potentially harmful mists, vapors, and atomized particulates. Read material manufacturer’s warnings and material MSDS to know specific hazards and precautions related to isocyanates.
Operation Basics Manual Valves Triggering gun with manual valves closed may cause crossover if gun ports contain residual chemical. Never open manual valves unless coupling block is secured to gun or exit port is directed into flush pail. 1. Open manual valves using 5/16 in. nut driver; turn manual valves counterclockwise approximately three full turns. Do not open until it bottoms out. 2. Close manual valves by turning fully clockwise.
Operation Basics Air Hose Connection To CONNECT air hoses, pull back sleeve of female fitting, insert male fitting and slide sleeve forward to secure connection. To DISCONNECT air hoses, pull back sleeve of female fitting and remove male fitting. Pull Sleeve Valving Rod Adjustment Screw Use to regulate amount of valving rod travel when gun trigger is depressed with air supply connected. Turn clockwise to decrease travel, and counterclockwise to increase travel. 1. Use 5/64 in.
Operation Basics Air Cap Adjustment Valve 3. Use 5/16 in. open-end wrench to tighten 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 properly clean end of valving rod. To OPEN valve, turn knob approximately 1/8 turn counterclockwise. To CLOSE valve, turn knob fully clockwise. FIG.
Initial Set Up Initial Set Up 1. Remove coupling block from gun. 2. Check valving rod clearance in closed position. Rod should extend approximately 1/32 in. (1 mm) beyond tip of mixing chamber. If it does not, see Valving Rod Adjustment procedure, page 21. 1/32 in. FIG. 9: Valving Rod (Closed Position) b. Open each manual valve to allow trapped air to escape. Bleed each side until chemical is free of air. c. Close both manual valves. 9.
Daily Start-Up Daily Start-Up Ensure gun is attached to coupling block and air hose, and the proportioning unit is at desired temperature and pressure. 1. Connect air supply to gun, page 9. 2. Adjust air cap valve, page 10. 3. Saturate felt in felt wiper with gun cleaner using flush can. 4. Trigger gun multiple times to ensure valving rod moves the full travel quickly and freely. Daily Shutdown Follow when gun is out of service for any length of time.
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, follow Clean Spray Gun Procedure, page 18.
Spray Pattern Adjustment Spray Pattern Adjustment This adjustment may create a large mass “bun” of urethane foam. Very high temperatures 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 position. Rod should extend approximately 1/32 in.
Spray Pattern Adjustment tern opens as adjustment is made (FIG. 12). FIG. 14: Split Pattern FIG. 12: Opening Spray Pattern 5. Fine tune spray pattern: a. After you back out adjustment screw, make fine adjustments (1/8 turns or less in either direction as required) to obtain pattern shown in FIG. 13. Moving the screw out beyond this point may cause the pattern to split, as shown in FIG. 14. FIG. 13: Desired Pattern 311320G b.
Spray Pattern Adjustment e. If buildup recurs shortly after cleaning tip, remove air cap and ensure inside is clean. Reinstall air cap and ensure airflow is properly set. If no buildup occurred on air cap, check the following items in this order and readjust if necessary: • Check Valving Rod Adjustment Screw/Sleeve setting.
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.
Maintenance Clean Spray Gun Procedure Thoroughly flush gun block with gun cleaner before removing valving rod or mixing components from gun block. Also allow chemicals in spray gun to cool before cleaning. 12. Clean screens, check valves and screen screw. See Filter Screw Removal and Service procedure, page 19. Inspect air cap, mixing chamber, and gun block for build up of material and clean as required. Do not use metal cleaning devices to clean plastic components.
Repair Repair Shut down proportioner and allow chemicals to cool before performing any repair procedures. Clean Center Line Components using Gun Service Kit prior to performing any repair procedures. Filter Screen Removal and Service 1. Perform Pressure Relief Procedure (page 13) and Clean Spray Gun Procedure, page 18. 2. Unthread screen mounting screw. Remove screen mounting screw and filter screen assembly from gun block. Screen Screw 4. Clean and inspect screen cavity.
Repair Clean Injection Slots 1. Perform Pressure Relief Procedure (page 13) and Clean Spray Gun Procedure, page 18. 7. Flush injection slots. With valving rod in open position, flush each injection slot with gun cleaner. Press flush can needle firmly into cleanout hole to create seal. Continue until gun cleaner sprays out chamber tip. 2. Remove check valves. 8. Inspect and clean check valves, page 22. A-Iso Check Valve (tall hexhead) 9.
Repair Valving Rod Adjustment In closed position, valving rod should extend approximately 1/32 in. (1 mm) beyond tip of mixing chamber. If it does not, follow this procedure: 5. Remove valving rod. Push back firmly on piston rod until end of Stop Bar emerges from cylinder. Positioner 1/32 in. FIG. 19: Valving Rod (Closed Position) 1. Perform Pressure Relief Procedure (page 13) and Clean Spray Gun Procedure, page 18. 2. Disconnect air supply from gun. 3. Remove spring retainer case.
Repair Centerline Component Removal tool into rear of gun block and tap with hammer until chamber ejects. Place chamber in gun cleaner. Mixing Chamber Refer to Figure 2 to view centerline components. 1. Perform Pressure Relief Procedure (page 13) and Clean Spray Gun Procedure, page 18. 2. Remove air cap by hand, turning it counterclockwise. Chamber Knockout Tool FIG. 22: Mixing Chamber Removal 3. Remove screen screw assembly. Flush and place in gun cleaner. 4. Remove check valves.
Repair a. Remove ball and spring assembly. Hold ball and unscrew assembly. If dirt or material build-up prevents complete removal of the spring, screw it back in. Soak assembly in gun cleaner and try to remove it again. If ball and spring assembly cannot be removed undamaged, replace it. b. Use check valve cleanout drill to clean inside of closure screw. Insert the flattened end of cleanout drill into opening at end of screw, avoiding spurs in the closure screw.
Repair Centerline Component Installation All gun block parts must be clean and free of damage before installation. 1. Remove felt wiper assembly from rear of mixing chamber. 2. Ensure internal mixing chamber parts are in place. 3. Insert chamber into gun block. Align keyway in chamber with pin protruding from top of hole in block. 5. Thread felt wiper assembly into back of mixing chamber. Do not tighten.
Repair 10. Replace valving rod spring and spring retainer case. Grasp knob, push in, and turn clockwise to lock in place. 11. Replace air cap. 12. Replace check valves and screen screw assembly. 13. Replace closure screw in top of gun block. 14. Mount gun onto coupling block. 15. Connect air supply to gun. 16. Adjust felt wiper and soak felt with gun cleaner. 17. Close manual valves and press trigger several times to ensure valving rod moves freely.
Parts Parts Model D Spray Gun Assembly M L K AE AF R X Z N B D V A AM U AS S D AL AP G E W J H Y AG AC F AJ AD AB AK AT D T B AA AN C AR AQ 26 311320G
Parts Model D Spray Gun Assembly Ref. No. A B C Part No. 295591 295185 296090 D 296091 E 296614 F 296615 G H J K L M 295592 296616 296617 N 295171 R S❄ T U 296618 V 296622 296623 295595 296624 W X 296620 296621 Description Qty. Hex nipple, 1/8 in. MPT, steel 1 Mounting screw, 1/2 in. LG 2 Ball and spring assembly (pack of 10) Check valve sleeve (pack of 10) Kit, A-check valve, includes C and D (pack of 10) Kit, R- check valve, includes C and D (pack of 10) Roll pin, 1/16 x 5/16 in.
Parts Mixing Chamber Size Reference Size 46 55 62 70 78 K (valving rod) 296578 296579 296580 296581 296582 296597 (N) 296586 (L) 296592 (L-LM) 296598 (N) 296587 (L) 296599 (N) 296588 (L) 296600 (N) 297592 (L) AC (chamber) 296594 (N-800) 296595 (N-810) 296584 (L-800) 296590 (L-800-LM) 296585 (L-810) 296591 (L-810-LM) AK (air cap) 296838 296634 296634 296635 296635 Cleanout spade 297007 (pack of 2) 295934 (pack of 2) 295935 (pack of 2) 295935 (pack of 2) 295935 (pack of 2) Table
Parts Standard Mixing Chambers Six standard mixing chambers are available. The following table provides a general description about use and operational performance of each chamber. Actual pattern sizes and outputs achieved may vary depending on material viscosity, hose length, condition of equipment, environment, working pressure, and additional factors. Designed for operation in confined areas and for spraying 3/8 to 1/2-in. (.7 to 46 Size 1.3 cm) thicknesses. Gun may be held within 4 in. (10.
Parts Air Cylinder Assembly Part Number 296632 B C F K J D A H E G Ref. No. Part No. Description A❄ 107083 O-ring, fluoroelastomer B 295494 Pan head machine screw, 8-32 x 3/16 in. C 295177 Front head blank D❄ 296627 U-cup (pack of 5) E❄ 296628 U-cup (pack of 5) F 295178 Cylinder G❄ 296631 Wear ring H 295179 Buttonhead cap screw J 295484 Piston assembly K▲ 295492 Label, warning Qty.
Parts Coupling Block Assembly Model 295887 E D D A A G B C B G F C F G E D A E A Model 295884 Model 295887 (Standard) Model 295884 (Recirc) Ref. No. A B C D Part No. 295662 295888 295889 296626 E F G 295619 295693 295886 Ref. No. Part No.Description A 295889 A-swivel fitting B 296626 Manual valve assembly (pack of 2) C 295619 Mounting screw D 295693 Pipe plug E 112307 Street elbow F 295886 Coupling block G 295888 R-swivel fitting 311320G Description Qty. Flush seal pipe plug, 1/8 in.
Notes Notes 32 311320G
Technical Data Technical Data Category Data Maximum Fluid Working Pressure Maximum Air Inlet Pressure Minimum Air Inlet Pressure Maximum Output (flow rate) Minimum Output (flow rate) Air Inlet Size A Component (ISO) Inlet Size R Component (Resin) Inlet Size Length Height Width (without coupling block) Weight Wetted Parts 1000 psi (7 MPa, 70 bar) 100 psi (0.75 MPa, 7.5 bar) 90 psi (0.6 MPa, 6 bar) 16 lbs/min (7.3 kg/min) * 2 lbs/min (0.9 kg/min) * x npt -5 JIC; 1/2-20 UNF -6 JIC; 9/16-18 UNF 9.25 in.
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.
