Graco Inc. GX-7A manual

311321H Operation, P ar ts , Ser vice , Repair GX-7A, GX-7 DI, and GX-7 400 Spra y Guns For use with non-flammabl e pol yurethane f oams, two- component coa ting systems (polyureas), and some tw o-component epo xy systems. For pr ofessional use only . Not for use in e xplosive atmospheres. See page 2 f or model inf ormation. 3500 psi (24 MP a, 240 [...]

Models 2 311321H Contents Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 W arnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Overall View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Center line Compo nents . . . . . . . . . . . . . . . . . . . 8 Mixing Modu le . . . . . .[...]

Warnings 311321H 3 W arnings The f ollowing general warnings are f or the setup , use, grounding, maintena nce, and repair of this equipment. Additional, mo re specific warnings may be f ound throughout the body of this manual where applicable . Symbols appearing in the body of the manual ref er to these general w ar nings. When these symbols appea[...]

Warnings 4 311321H FIRE AND EXPLOSION HAZARD Flammab le fumes, such as solv ent and paint fumes , in w ork area can ignite or e xplode. T o help pre vent fire and e xplosion: • Use equ ipment only in well v entilated area. • Eliminate all ignition sources; such as pilot lights , cigarettes , por table electric lamps, and plastic drop cloths (po[...]

Warnings 311321H 5 PRESSURIZED ALUMINUM P ARTS HAZARD Do not use 1,1,1-trichloroethane, meth ylene chlori de, other halog enated h ydrocarbon solv ents or fluids containing such solv ents in pres surized aluminum equ ipment. Such use can cause serious chemical reaction and equipment rupture, and result in death, serious injur y , and prop- er ty da[...]

Overall Vi ew 6 311321H Overall Vie w F IG . 1: GX-7A Overall View F IG . 2: GX-7 DI Overall View 2 ! Model GX-7A V alving Rod Rear Stop Air Cap Adjustment V alv e V alving Rod F orward Stop Rear P acking Nut Tr i g g e r Manual V alves Gun Bloc k F orward Stop Locknut Model GX-7 DI[...]

Overall View 311321H 7 F IG . 3: GX-7 400 Overall View ! 2 Model GX-7 400 V alving Rod Rear Stop V alving Rod Forward Stop Air Cap V alve Rear P acking Nut Forwar d Stop Locknut Gun Block Tr i g g e r[...]

Overall Vi ew 8 311321H Centerline Components F IG . 4: GX-7A Centerline Components F IG . 5: GX-7 DI Centerline Components Model GX-7A V alving Rod Pa ck i n g Nut Rear Pac k ing Gun Bloc k Rear Pac king Retainer A-Screen Screw Screen Screw Seal Screen Chec k V alve Mixing Module PCD Body Fr ont P ack ing PCD Retainer Air Cap O-ring P attern Contr[...]

Overall View 311321H 9 F IG . 6: GX-7 400 Centerline Components V alvin g Rod Rear Seal Retainer Rear P acking Retainer Rear P acking A-Screen Screw Screen Scre w Seal Screen Check V alve Coupling Block Mounting Scre w Coupling Bloc k Gasket Gun Bloc k PCD Retainer Air Cap P attern Contr ol Disc (PCD) Mixing Module Chec k V alve Spring Screen Screw[...]

Overall Vi ew 10 311321H Mixing Module All gun models employ the concept of impinge- ment mixing through t he use of a single-part MIXING MODULE. This system is cleaned by a mechanical self-cleaning process, eliminat- ing the need for solvent or air purging between dispenses. The gun can be assembled with two styles of mixing components; thei r sel[...]

Operation Basics 311321H 11 Operation Basics Isocy anate Hazar d K eep A and B Components Separate Gr ounding Check your local electr ical code and propor- tioner manual for deta iled grounding instruc- tions. Ground the spray gun thr ough connection to a Graco-approved grounded fluid supply hose. Safety P osition The guns have a two-position valvi[...]

Operation Basics 12 311321H Disengage Safety Stop To disengage safety stop, push in and turn safety stop counterclockwise to place gun in OPEN position (red band is exposed). F IG . 11: Safety Stop - Open Close Manual V alves Closing manual valves prevents chemicals in heated hoses from enterin g gun. For your own safety, close manuals valves befor[...]

Operation Basics 311321H 13 Coupling Bloc k Chemical hoses are jo ined to gun block by coupling block to ease installation and removal of gun. Manual V alves Two manual valves loca ted on coupling block control flow of each ch emical component to gun. Open Manual V alves Use 5/16 in. nut driver to turn manual valve counterclockwise three full turns[...]

Operation Basics 14 311321H 3. Inser t coupling bl ock mounting scre w and use 5/16 in. nut driv er to tighten to gun blo ck . F IG . 15: Install Coupling Bloc k Remove Coupling Bloc k 1. Set saf ety stop to CLOSED (SER VICE). 2. Disconnect air hose. 3. Close both manual v alves . 4. Remov e coupling bloc k mounting screw . 5. Separate coupling b l[...]

Operation Basics 311321H 15 Mixing Module and PCD Installation 1. Install mixing module: a. Disconnect gun fr om coupling bloc k. b . Connect air supply to gun. c. Set saf ety stop to OPEN. d. Hold down trigger and place module ov er tip of valving rod. e. Align ke ying pin with hole in gun bloc k and push in fir mly (G X-7 DI model only). f . Inst[...]

Operation Basics 16 311321H V alving Rod Adjustment GX-7A and GX-7 400 Models Only 1. Push in rear stop to SER VICE position. 2. If attached, tur n both manual v alves fully clockwise to close (see Manual V alves , page 13). 3. Connect air line from gun to air source to pressurize air cylinder forw ard to CLOSED position. 4. Loosen f orward stop lo[...]

Operation Basics 311321H 17 Initial Set Up 1. Install f emale quick disconnect fitting to air supply hose bundled wi th chemical supply hoses. 2. Connect coupling bl oc k to hose b undle. Connect A-Isocyanate hose (red-tape) to notched fitting on coupling bl ock. Connect R-Resin hose (b lue-tape) to fitting without notches on coupling bloc k. 3. Cl[...]

Operation Basics 18 311321H Dail y Star t-up 1. Connect air supply to gun. 2. Adjust air cap adjust ment v alv e. T ur n knob counterclockwise to open v alve and cloc k- wise to close valv e 3. Adjust rear seal retainer . 4. Open both manual v alves . See Coupling Block section, page 13. 5. Set saf ety stop to OPEN. 6. T est spra y on disposab le s[...]

Pressure Relief Procedure 311321H 19 Pressure Relief Pr ocedure 1. Close both manual v alves . F IG . 19: Close Manual V alves 2. Set saf ety stop to OPEN. 3. T r igger gun onto ca rdboard or into waste container to relie ve pressure. F IG . 20: T rigger Gun 4. Release gun trigger , set safety stop to CLOSED , and close manual v alv es. F IG . 21: [...]

Maintenance 20 311321H Maintenance Gun Service Kits Use either the 1-Q uart Gun Service Kit (296980) or 3-Gallon G un Service Kit (296981) to perform daily flushing of spray gun without disassembly. F IG . 22: 1-Quart Gun Ser vice Kit For more information about the 1-Quart Gun Service Kit, see Manual 311340. F IG . 23: 3-Gallon Gun Service Kit For [...]

Maintenance 311321H 21 2. Close both manual v alves . 3. Remov e gun from coupling bloc k. 4. Attach ser vice bloc k of gun ser vice kit to spra y gun, and then ti ghten using 5/16 in. nut driver . 5. Pressurize Ser vice Kit container up to 100 psi. DO NO T EXCEED 100 psi (0.7 MP a, 7 bar). 6. Open one manual v alve on ser vice bloc k. 7. Connect a[...]

Repair 22 311321H Repair Service Screen Screw 1. Flush gun according to Clean Spray Gun Procedure , page 20. 2. Unthread screen screw from gun b lock. 3. Remov e check v alve from screen scre w . Clean v alve with gun cleaner and inspect f o r damage. Replace if necessary . 4. Remov e screen from screen screw . Soak in gun cleaner or replace if clo[...]

Repair 311321H 23 11. Remov e v alving rod. F IG . 24: Remove V alving Rod a. Depress trigger lev er and hold. GX-7 DI model only: loosen piston stop lockn ut until it dis engages from thread on v alving rod. b . Use 5/16 in. nut driv er to unthread rod dra w bar and v alving rod from rear of gun. c. When threads disengage remov e assemb ly by hand[...]

Repair 24 311321H Install Centerline Components GX-7 DI Model Only Before installation, ensure all gun components are clean and dry. Lubric ate all moving parts and threads. 1. Install rear packi ng gland with pac king wrench. Tighten onto gun bloc k. 2. Install rear packi ng retainer loosely . 3. Install v alving rod. a. Connect v alving rod to ro[...]

Repair 311321H 25 Replace End Cap and Air Piston Assembl y F IG . 25: GX-7 DI End Cap and Air Piston Assembl y 1. Clean gun according to Clean Spray Gun Procedure , page 20. 2. Loosen rear packing nut 1-2 turns. 3. Push saf ety stop par tially forw ard, rotate counterclockwise , and slide safety stop off air cylinder . 4. Remov e valving rod. See R[...]

Repair 26 311321H Replace T rigger V alve O-Rings 1. Clean gun according to Clean Spray Gun Procedure , page 20. 2. Disconnect air s upply from gun. F IG . 26: Replace T rigger V alve O-Ring 3. Remov e mounting screw and loc knut that hold trigger in place. Remov e trigger . 4. Remov e valv e retainer nut. 5. Pull out v alv e spool and v alve sprin[...]

Repair 311321H 27 Clean Mixing Module 1. Flush gun according to Clean Spray Gun Procedure , page 20. 2. Connect air supply to gun. Set saf ety stop to OPEN. 3. Remov e air cap by hand. F IG . 27: Unthread Cap from PCD Bod y 4. T r igger gun and hold it to reliev e pressure on PCD retainer . 5. Remov e PCD retainer by turning it counter- clockwise .[...]

Repair 28 311321H Install Mixing Module 1. Install saf ety stop; leav e in OPEN position. 2. Connect air supply to gun. 3. Depress gun trigger and slide mixing mod- ule ov er end of valving rod. GX-7 DI model only: ensure valving rod alignment pin enters alignment slot in gun b lock. K eep gun trigger depressed. 4. With gun trigger de pressed, thre[...]

Repair 311321H 29 Clean P attern Contr o l Disc 1. Set saf ety stop to CLOSED (SER VICE). 2. Close both manual v alves . 3. T ur n off air to air cap. 4. Use cotton s wab soak ed in gun cleaner to clean e xter nal surf ace of mater ial build up . Light scrubbing with impinger cleanout brush may also be required. a. T r igger gun to SER VICE positio[...]

Parts 30 311321H Pa r t s GX-7A Model Final Assembl y Part Numbers 295542, 295543, 295544, 29545 2 ! 2, 26 3 4 6 5 7 8 9 10 11 12 13 14 15 16 17 18 19 21 7 8 9 22 25 23 24 1 20[...]

Parts 311321H 31 GX-7A Model Final Assemb ly Part Numbers 295542, 295543, 295544, 295545 Ref. No. P ar t No. Description Qty . 1 295810 Spra y gun handle 1 2 15B77 2 Air hos e 1 3 295596 Coupler plug 1 4 295597 Coupler 1 5 296834 R-gun bloc k screen screw assembly (include s 6, 7, 8, 9) 1 6 R-gun bl ock screen scre w 1 7 296693 Screen scre w seal ([...]

Parts 32 311321H GX-7 DI Model Final Assembl y (295541) 5 6 7 8 2, 21 3 4 10 12 13 14 15 16 6 7 17 18 19 9 11 1[...]

Parts 311321H 33 GX-7 DI Model Fina l Assembl y (295541) Ref. No. P ar t No. Description Qty . 1 295809 Spra y gun handle assemb ly 1 2 15B772 Air ho se, 1/4 in. x 23 in. (FXF) 1 3 295596 Coupler plug 1 4 295597 Coupler 1 5 295835 R-screen screw 1 6 296792 Screen, 80 mesh (pac k of 10) - 296724 Screen, 80 mesh (pac k of 50) - 7 296713 Check v alve [...]

Parts 34 311321H GX-7 400 Model Final Assembl y (295540) 2 ! 7 11 12 9 6 14 15 16 8 18 21 19 20 2 13 4 3 1, 24 10 12 9 6 5 22 23[...]

Parts 311321H 35 GX-7 400 Model Final Assembl y (295540) Ref. No. P ar t No. Description Qty . 1 15B77 2 Air hos e 1 2 296128 Coupling b lock gask et (pac k of 2) - 3 295596 Coupler plug 1 4 295597 Coupler 1 5 295384 Gun bloc k (includes 13) 1 6 296722 Check v alve assembly (pac k of 10) - 7 295799 Spra y gun handle assemb ly 1 8 296692 V alving ro[...]

Parts 36 311321H GX-7A Model Handle Assembl y (295810) 6 3 8 2 27 7 18 9 12 14 37 27 15 4 10 11 36 16 19 34 32 17 28 42 41 39 40 38 1 13 5 43 24 26 28 35 27 21 20 23 30 33[...]

Parts 311321H 37 GX-7 Model Handle Assembl y (295810) † P ar ts included in Handle Se al Rebuild Kit 296895 (purchase separate ly). ❄ P ar ts included in T r igger valv e rebuild kit 296897 (purchase separate ly). Ref. No. Part No. Description Qty . 1 296862 Spra y gun handle 1 2 295678 Cylinder end cap assembly 1 3 295676 Spring 1 4 295675 Air[...]

Parts 38 311321H GX-7 DI Model Handle Assembl y (295809) 25 10 9 18 12 17 2 34 11 19 13 20 14 34 3 40 15 22 31 24 29 16 30 37 8 27 39 36 33 1 21 26 7 38 30 5 28 4 32 6 23 35[...]

Parts 311321H 39 GX-7 DI Model Handle Assembl y (295809) † P ar ts included in Air Cylinder Reb uild Kit 296895 (purchase separ ately). ❄ P ar ts included in T r igger V alv e Rebuild Kit 296897 (purchase separate ly). Ref. No. Part No. Description Qty . 1 296862 Gun handle 1 2 295714 Cylinder end cap assemb ly 1 3 295715 Air cylinder 1 4 29568[...]

Parts 40 311321H GX-7 400 Model Handle Assembl y (295799) 03)-!8 15 14 17 32 3 16 25 18 21 23 39 40 3 8 31 11 33 2 10 24 30 19 20 29 28 26 5 4 7 38 22 1 37 12 4 35 3 34 6 36 27 9 13[...]

Parts 311321H 41 GX-7 400 Model Handle Assembl y (295799) † P ar ts included in Air Cylinder Reb uild Kit 296895 (purchase separ ately). ❄ P ar ts included in T r igger V alv e Rebuild Kit 296897(purchase separ ately). Ref. No. Part No. Description Qty . 1 106245 Cap scre w , SCH 2 2 295662 Pipe plug 1 3† ❄ 106555 P acking o-ring 6 4† ❄[...]

Parts 42 311321H Coupling Bloc k Assembl y (295383) All models 1 5 1 6 3 4 2 Ref. No. Part No. Descript ion Qty . 1 295662 Pipe plug, flush seal, 1/8 in. 2 2 117634 R-s wiv el fitting 1 3 117635 A-s wiv el fitting 1 4 295693 Pipe plug, flush seal, 1/16 in. 2 5 296970 Manual v alve assemb ly 2 6 296215 Coupling b l ock 1[...]

Specific ations 311321H 43 Specifications GX-7A Mix Module Kit † Module Kits include one mix module and both clea- nout tools. See following t able. ❄ Some Module Kits also available in packs. See follow- ing table. Module Kit† ❄ Module Onl y Cleanout T ool P art No. Size Ref. P a rt No. Siz e Ref. (A) Iso Port Par t N o . Diameter in/(mm) [...]

Specifications 44 311321H Set-Up Char t f or GX-7A Model ❄ At 24 in. above substrate ❖ At 18 in. above substrate Pres- sure (psi) Output (lbs/min) Pa t t e r n Dia. (inches) Module P ar t No. Po l yo l Po r t Size No. Orifices Iso P or t Size No. Orifices Tip Round Spray P attern 1000 22 ❄ 22 29690 9 (#1) .0320 4 .0320 4 296712 1000 12 ❄ 12[...]

Specific ations 311321H 45 GX-7 400 Mix Module Kit Module Kits Cleanout Drill P art No. Size Ref. Quantity Iso P ort Pa r t N o . Diameter in/(mm) Po l y o l Po r t Pa r t N o . Diameter in/(mm) 296885 296884 402 Round 1 12 246816 .018 (.45) 246816 .018 (.45) 296859 296860 451 F an 1 12 246816 .018 (.45) 246816 .018 (.45) 296888 296887 452 F an 1 1[...]

Specifications 46 311321H Set-up Char t for GX-7 400 Model ✖ At 24 in. above substrate ❖ At 18 in. above substrate Pres- sure (psi) Output (lbs/min) Pa t t e r n Dia. (inches) Module P ar t No. Po l y o l Po r t Size No. Orifices Iso P or t Size No. Orifices Tip Round Spray P attern 1500 3.5 ✖ 8 296885 (402) .0180 1 .0180 1 296858 Fan Spra y [...]

Specific ations 311321H 47 GX-7 DI Model Specifications ❄ Actual results may vary due to chemical system characterist ics, temperature, pressure, and ratio. ✖ Includes appropriat e cleanout drills. Module/Tip Data f or Chemical Spray ed at 2500 PSI ✖ Module Kit Cleanout Drill Ref. No. ❄ P attern ❄ Output (lbs/min) Fan Spra y Pattern 29690[...]

Specifications 48 311321H Tip Kits For GX-7A and GX-7 DI Models T ool Kits GX-7A and GX-7 DI models: 296835 GX-7 400 model: 296184 Round Tip Kits P art No. Size Quantity 296708 40 1 296709 46 1 296717 55 5 296710 70 1 296718 70 5 296711 80 1 296719 80 5 296712 90 1 296720 90 5 296694 100 1 296714 100 5 296695 110 1 296696 110 5 296697 125 1 296877 [...]

Technical Data 311321H 49 T echnical Data ❄ Theoretical: actual results wil l v ar y with operating conditions Category Data Air Supply 100-125 psi (7.9 bars) Maximum Operating Pressure 3500 psi (24 MP a, 240 bar) Maximum Output ❄ 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) Mi[...]

All written and visual data contained in this document reflects the late st product information available at the time of publica tion. Graco reserves the right to make changes at any time without notice. Original instructions. This manual contains English. MM 311321 Graco Headquarters: Minneapolis International Offices: Belgium, China, Japan, Korea[...]