Operation - Parts AR Pour Gun For use with non-flammable polyurethane foams. Not for use in explosive atmospheres. Part No. 255828 2000 psi (13.8 MPa, 138 bar) Maximum Working Pressure Important Safety Instructions Read all warnings and instructions in this manual. Save these instructions.
Contents Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Isocyanate Hazard . . . . . . . . . . . . . . . . . . . . . . . . . 5 Material Self-ignition . . . . . . . . . . . . . . . . . . . . . . . 5 Moisture Sensitivity of Isocyanates . . . . . . . . . . . . 5 Keep Components A and B Separate . . . . . . . . . . 5 Foam Resins with 245 fa Blowing Agents . . . . . . . 5 Changing Materials . . . . . . . . . . . . . . . . . . . . . . . . . 5 Components . . . . . . . . . . . . . . . .
Warnings Warnings The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risk. Refer back to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where applicable.
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 and clean 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.
Isocyanate Hazard Isocyanate Hazard • Keep the ISO lube pump reservoir (if installed) filled with Graco Throat Seal Liquid (TSL), Part 206995. The lubricant creates a barrier between the ISO and the atmosphere. • Spraying materials containing isocyanates creates potentially harmful mists, vapors, and atomized particulates. Use moisture-proof hoses specifically designed for ISO, such as those supplied with your system.
Components Components F Overall View E G B C D A U Q Gun Block T R S P V M N W X L AA K Z AB H AE AC J Y AD Key: A Manual Valves B Gun Block C Coupling Block D Trigger E Valving Rod F Piston Rod G Safety Stop H Pattern Control Tip J Front Packing K O-ring L Front Impinger M Throat N Rear Impinger P Screen Screw Mounting Screw Q R-Port Closure Screw 6 R S T U V W X Y Z AA AB AC AD AE Gun Block Resin Seal Retainer Spacer Resin Seal Screw O-ring Resin Packing A-Port Closure Screw Gun
Operation Basics Operation Basics Safety Stop To prevent accidental gun operation, always disconnect air supply before servicing gun or anytime gun is not in use. The gun has a two-position safety stop. The SERVICE (CLOSED) position permits both material inlet ports to remain closed when gun is triggered. Safety Stop Grounding Check your local electrical code and your proportioner manual for detailed grounding instructions.
Operation Basics Air Hose Connection Connect Air Hoses Pull back sleeve of female fitting, insert male fitting and slide sleeve forward to secure connection. 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. Disconnect Air Hoses Pull back sleeve of female fitting and pull out male fitting.
Operation Basics 7. Cover exposed openings with grease. Coupling Block Install Coupling Block Replace nicked, damaged, or worn coupling block gaskets. 1. With gaskets in place, fit coupling block to gun block. 2. Insert coupling block mounting screw and use 5/16 in. nut driver to tighten to gun block.
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. 3. Adjust valving rod travel to initial setting. See Valving Rod and Resilient Sleeve, page 17. 4. Connect air supply hose to gun. 5. Connect A-isocyanate hose (red-taped) to notched fitting on coupling block. Then connect R-resin hose (blue-taped) to fitting without notches on coupling block. 6.
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. Ensure gun is mounted onto gun block. Daily Shutdown Follow daily shutdown when gun is out of service for any length of time. Daily disassembly of gun for cleaning is not recommended if it has been operating properly. However, if you remove the gun from the coupling block, flush and clean thoroughly. 2.
Pressure Relief Procedure Pressure Relief Procedure Relieve pressure before cleaning or repairing gun. 1. Close both manual valves. Manual Valves 2. Set safety stop to OPEN. 3. Trigger gun onto cardboard or into waste container to relieve pressure. 4. Release gun trigger, set safety stop to SERVICE (CLOSED), and close manual valves. If fluid in hose and proportioner is still under pressure, follow Pressure Relief Procedure in your Proportioner manual.
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. Daily Cleaning Procedure, with Gun Service Kit To avoid static sparking that may result in fire or explosion, ensure all equipment in cleaning procedure is grounded. Do not clean on or near foamed or coated surfaces or any other flammable surfaces or objects. 1. Set safety stop to SERVICE (CLOSED). 1-Quart Kit 2.
Maintenance Daily Cleaning Procedure, without Gun Service Kit If the Gun Service Kit is not available, the iso side components must be cleaned daily. See AR Gun Tool Kit 253728 on page 28. 1. Place safety stop in SERVICE (CLOSED) position. 2. Remove pattern control tip. 3. Remove front impinger, packing, and o-ring from pattern control tip. 4. Using pattern control tip/impinger cleanout tool (607), clean the inside bore of the pattern control tip by inserting and spinning. 5.
Troubleshooting Troubleshooting Problem Interruption of flow of one material Change of color in mixed product Only one component coming out of gun Cause Running out of material Supply more material to proportioner Materials in proportioner are too viscous Check with material supplier for recommended temperature range that should be maintained to control viscosity. Filter screens are clogged Flush gun. See Flush Gun, page 14.
Repair Repair 3. Remove front impinger from front packing. It is not necessary to remove front packing if no damage to packing is evident or suspected. Front Impinger CAUTION Shutdown proportioner and allow chemicals to cool before servicing gun. Clean A and R components in separate containers to avoid cross contamination. Tools Required • • • • • • • • • • • • • flush can impinger cleanout brush 5/16 in.
Repair 3. Slide screen screw assembly out of gun block. Allow excess Isocyanate material to drain. 2. Remove spring retainer case by grasping handle firmly and pushing in on retainer case with palm of hand. Simultaneously rotate case a quarter turn counterclockwise to remove case from locking collar. Port Closure Plug Spring Retainer Case Screen Screw Mounting Screw 4. Flush assembly and place it in gun cleaner. 5. Remove port closure plugs with nut driver.
Repair Reassembly 1. If valving rod resilient sleeve assembly was removed or is being replaced, use the following steps: a. Thread coupler onto resilient sleeve assembly by hand as far as it will go toward sleeve. There should be approximately 1/16 in. (1.5 mm) clearance between coupler and valving rod. b. Use a 6 in. adjustable wrench and a 5/16 in. nut driver to securely tighten coupler. Coupling Block and Check Valves Disassembly 1. Follow Pressure Relief Procedure, page 12. 2. Use 5/16 in.
Repair 7. If material buildup prevents easy removal, use three-pronged end of check valve removal tool to grasp check valve and turn free. Opposite end of check valve removal tool is designed to clean check valve cavity. Impingers Disassembly and Cleaning 1. Follow Pressure Relief Procedure, page 12. 2. Perform Pattern Control Tip steps; see page 16. 8. Place all parts in gun cleaner and flush exposed ports. Reassembly 1. Inspect seats on gaskets for nicks. Replace seats if damaged. 3.
Repair 2. Thread throat assembly by hand into gun block. Use throat wrench to tighten. Front impinger should contact throat surface about 1/2 to 3/4 turns from actual seating of throat to gun block surface. This compression creates the internal seal within front portion of chamber. 3. Assemble front impinger and pattern control tip. Insert front packing into pattern control tip. Place front impinger over end of front packing. Place pattern control tip o-ring into groove on pattern control tip. 4.
Repair 7. Soak gun block in gun cleaner. CAUTION 6. Set safety stop to SERVICE (CLOSED), and then pull trigger to determine if weepage occurs in this position. Do not allow gun block or component parts to soak in gun cleaner for extended periods of time, such as overnight, as certain solvents may cause corrosion or pitting. Do not soak gun block o-rings in gun cleaner. To clean o-rings, dip in gun cleaner and immediately wipe dry. Weepage 8.
Repair 22 312888D
Parts Parts AR Pour Gun 255828 Impinger Options Impinger (C Size) Front BA BC Rear Part Style Part Style Orifice Area Factor 299974 23-B-1 299990 23-B-1 900 299975 33-B-1 None 33-B-1 1200 299976 33-C-1 299991 33-C-1 1800 299977 34-C-1 299992 34-C-1 2400 299980 46-B-1 299995 46-B-1 3000 299978 36-C-1 299993 36-C-1 3600 None 46-C-1 299996 46-C-1 4500 299982 48-C-1 299997 48-C-1 6000 299983 58-C-1 299999 58-C-1 7200 Table 1: Impinger Options - C Size Ref
41 31 43 24 29 15 44 8 32 13 7 23 5 40 12 35 1† 2† 34 6 3† 9 22 4† 33◆ 36◆ 21 14 17 37 19 25 39 18 19 24 26 27 38 10 20 28 11 Parts Auto AR-C Gun 255827 312888D
Parts Ref 1† 2† 3† 4† 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Part 296621 296622 295595 295175 296128 295623 295624 297307 295693 295596 208536 297308 296129 299923 297150 299925 299951 298354 299475 299960 299962 297312 296136 299966 297313 Description SEAL, screw, screen SCREEN, block, gun RING, retaining SCREW, screen, gun block GASKET, block, gasket VALVE, check, A VALVE, check, R SCREW, mounting, 1 in.
222 203 218 227 201 229 220 224 201 221 225 223 226 203 203 204 228 219 235 233 209 206 202 205 205 211 216 231 205 208 210 215 217 210 212 234 232 207 214 213 230 230 Parts Gun Handle Assembly 256213 312888D
Parts Ref 201 202 203 204 205 206 207 208 209 Part 298116 108195 C19950 296066 106555 106560 C20988 112085 299917 210 211 212 213 214 215 216 217 295685 299926 299927 299928 299929 299930 299931 299932 Description SCREW, 4-40 x 3/4 shcs PACKING, o-ring SCREW, cap, sch O-RING, piston, pump PACKING, o-ring PACKING, o ring PACKING, o-ring PACKING, o-ring SCREW, 5-40 x 3/8 button-hd cap O-RING TRIGGER, bushing SPRING, TRIGGER, actuator pin SPOOL RING, seal ROD, piston VALVE, exhaust cap Qty 3 1 4 3 3 1 1
Parts Coupling Block Assembly 285771 506 503 505 Ref 501 502 503 504 505 Part 295619 295693 506 117595 Ref 601 602 603 604 605 606 607 608 609 610 611 612 Part 117642 117661 118665 285763 117506 Description SCREW, mounting PLUG, pipe (285771 only) VALVE, manual BLOCK, coupling FITTING, swivel, 1/4 npt x #6 JIC FITTING, swivel, 1/4 npt x #5 JIC Qty 1 2 2 1 1 1 501 502 504 AR Gun Tool Kit 253728 604 607 606 285765 285767 295898 295935 296187 296191 297973 Description Qty TOOL, nut driver 1
Parts AR-D Conversion Kit 24A023 See Repair section on page 16 for conversion kit parts installation.
30 37)4#( 2%452. $)30%.3% !#4)6% $)30%.3% 2%15%34 !#4)6% 3/,%./)$ 6!,6% #/), 2%452. #!3% $)30%.3% #/--!.$ !2 '5. (!.$,% * * * '5.
Technical Data Technical Data Category Data Maximum Fluid Working Pressure Minimum Air Inlet Pressure Maximum Air Inlet Pressure Maximum Output (flow rate) † Air Inlet Size A Component (ISO) Inlet Size R Component (Resin) Inlet Size Length Height Width Weight Wetted Parts 2000 psi (13.8 MPa, 138 bar) 90 psi (0.62 MPa, 6.2 bar) 120 psi (0.84 MPa, 8.4 bar) 40 lb/min (18.1 kg/min) 1/4 npt, quick disconnect nipple #5 JIC #6 JIC 12.5 in. (318 mm) 9.5 in. (241 mm) 2.8 in. (71 mm) 6.7 lbs (3.
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.
