Instructions - Parts EP™ Gun 313872N EN Plural Component, Impingement Mix, Mechanical Purge Pour Gun For use with non-flammable foam in open pour applications. Not approved for use in European explosive atmosphere locations. Model 257999, 24C932 3000 psi (20.7 MPa, 207 bar) Maximum Fluid Working Pressure 80-100 psi (0.55-0.69 MPa, 5.5-6.9 bar) Air Inlet Pressure Range 180°F (82°C) Maximum Fluid Temperature Important Safety Instructions Read all warnings and instructions in this manual.
Contents Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Orifice Flow Area Ratio Chart . . . . . . . . . . . . . . . 4 Fixed Orifice Flowrate Data . . . . . . . . . . . . . . . . . 5 Variable Orifice Flowrate Data . . . . . . . . . . . . . . 6 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Important Two-Component Material Information 11 Isocyanate Conditions . . . . . . . . .
Related Manuals Related Manuals Manuals are available at www.graco.com. Component manuals in U.S.
Models Models Part Purge Rod Diameter in. (mm) Orifice Size in. (mm) Handle Type 257999 0.250 (6.35) 0.031 (0.79) Handheld 24C932 0.250 (6.35) 0.031 (0.79) Auto Orifice Flow Area Ratio Chart In general, flow area ratio should be equal to material ratio but will be influenced by material viscosity. The ideal flow area ratio is dependent on flow rates, material viscosity, and material ratio. Choose the correct size orifices to equalize fluid pressures at the proportioner.
Models Fixed Orifice Flowrate Data EP Fixed Orifice Flow Data 5.00 4.75 0.086 in. Diameter Orifice 4.50 4.25 4.00 0.067 in. Diameter Orifice 3.75 3.50 3.25 0.060 in. Diameter Orifice Flow (gpm) 3.00 2.75 2.50 2.25 0.047 in. Diameter Orifice 2.00 1.75 1.50 1.25 0.031 in. Diameter Orifice 1.00 0.75 0.020 in. Diameter Orifice 0.50 0.25 0.00 500 750 1000 1250 1500 1750 2000 Pressure (psi) EP Gun Flowrate Data, Tested with 2 lb Foam HFR with 160/160 and EP250 350 (5.53) 300 (4.74) 250 (3.
Models Variable Orifice Flowrate Data VARIABLE ORIFICE FLOWRATE DATA (1000 PSI) 0.086 0.073 0.067 0.063 ORIFICE DIAMETER (in.) 0.060 0.055 0.052 0.047 0.041 0.039 0.033 0.031 0.028 0.024 0.020 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 FLOWRATE (gpm) * To calculate flow in lb/min, multiply gpm rate by 10. Example: 2 gpm x 10 = 20 lb/min.
Models VARIABLE ORIFICE FLOWRATE DATA (1500 PSI) 0.086 0.073 0.067 0.063 ORIFICE DIAMETER (in.) 0.060 0.055 0.052 0.047 0.041 0.039 0.033 0.031 0.028 0.024 0.020 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 FLOWRATE (gpm) * To calculate flow in lb/min, multiply gpm rate by 10. Example: 2 gpm x 10 = 20 lb/min.
Models VARIABLE ORIFICE FLOWRATE DATA (2000 PSI) 0.086 0.073 0.067 0.063 ORIFICE DIAMETER (in.) 0.060 0.055 0.052 0.047 0.041 0.039 0.033 0.031 0.028 0.024 0.020 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 FLOWRATE (gpm) * To calculate flow in lb/min, multiply gpm rate by 10. Example: 2 gpm x 10 = 20 lb/min.
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 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.
Important Two-Component Material Information Important Two-Component Material Information Isocyanate Conditions Spraying or dispensing 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. Prevent inhalation of isocyanate mists, vapors, and atomized particulates by providing sufficient ventilation in the work area.
Important Two-Component Material Information Changing Materials • When changing materials, flush the equipment multiple times to ensure it is thoroughly clean. • Always clean the fluid inlet strainers after flushing. • Check with your material manufacturer for chemical compatibility. • Most materials use ISO on the A side, but some use ISO on the B side. • Epoxies often have amines on the B (hardener) side. Polyureas often have amines on the B (resin) side.
Throat Seal Liquid Throat Seal Liquid Disengage To disengage piston safety lock, push knob in and turn counterclockwise until it pops out. There will be a gap between knob and gun body. Read material MSDS to know specific hazards and precautions related to Throat Seal Liquid. Grounding TI14473b TI14474a FIG. 2: Piston Safety Lock Disengaged Check your local electrical code and proportioner manual for detailed grounding instructions.
Loss of Air Pressure Loss of Air Pressure Purge rod actuation is controlled by air pressure. In event of loss of air pressure, the purge rod will remain retracted, the impingement ports will remain open, and the gun will continue to pour. To stop pouring, do one of the following: • Engage piston safety lock, see Piston Safety Lock section • Close fluid valves A and B, see FIG. 3 Hook Support If necessary, use the hook support located on the top of the gun to support the weight of the gun.
Hook Support 313872N 15
Component Identification Component Identification See Parts on page 40 for part numbers and further component identification. E B A M H C J H K N D P R L F G ti19550a FIG.
Component Identification Cutaway View H J H E A B K R C D G ti19551a 313872N 17
Theory of Operation Theory of Operation Gun Triggered (Fluid Pouring) Gun Detriggered Purge rod retracts, opening the impingement ports and allowing fluid to mix and flow through the nozzle. Purge rod extends, closing the impingement ports and stopping fluid flow.
Setup Setup Perform this setup procedure to get the pour gun ready for operation. 6. Connect gun air whip hose (AA) to air quick coupler (AC). Turn on air. Open air valve (AB). See FIG. 6. 1. Close fluid valves A and B. AA AB B A AC AD ti19556a FIG. 6 TI2411a 7. Connect signal cable to solenoid valve. FIG. 5 2. Connect A and B fluid hoses to fluid manifold. 8. Models with a handle, connect signal cable to handle. 9. Disengage piston safety lock. See page 13. TI2417a 3.
Setup 11. Engage piston safety lock. See page 13. Adjust Orifices 12. Turn on proportioner. See proportioner manual. In order to balance pressures between the A component and B component the needle in each orifice may need to be adjusted. Be sure that all necessary adjustments to the proportioner are made prior to adjusting the orifices, see proportioner manual. 13. Open fluid valves A and B.
Setup Optional Hose Position As shipped, fluid inlet swivel fittings point to rear of the gun. If desired, use the following procedure to make the fluid inlet swivel fittings point downward. 5. Apply thread sealant to plugs (AH), elbows (AJ), and male threads of swivels (AE). Install elbows (AJ) in optional inlets, facing down. See FIG. 11. Install swivels in elbows. Be sure to install the A swivel in the A side. Install plugs (AH) where swivels had been. Torque all parts to 235-245 in-lb (26.6-27.
Pressure Relief Procedure Pressure Relief Procedure 7. Relieve system pressure. See Pressure Relief Procedure in proportioner manual. 8. Ensure fluid valves are closed then remove fluid manifold. 1. Engage piston safety lock. See page 13. NOTE: Air supply is required for purge rod actuation. Do not disconnect gun air supply until fluid pressure is relieved. 9. Place the fluid manifold over waste containers, facing away from you. 2. Close fluid valves A and B. Leave air valve (AB) open. 10.
Shutdown Shutdown Short Term Shutdown Long Term Shutdown Perform Short Term Shutdown procedure if gun will not be used for more than one hour. Perform Long Term Shutdown procedure if gun will not be used for more than 48 hours. 1. Perform Pressure Relief Procedure on page 22. 1. Perform Short Term Shutdown. 2. Engage piston safety lock. 2. Flush Gun, see page 25. 3. Trigger gun to retract purge rod. 4. While purge rod is retracted, remove any material build-up on front poor tip and front packing.
Maintenance Maintenance Procedure Schedule Grease the Gun, page 24 Daily Replace Mix Chamber and Front Seal, see page 29 Every 2-4 Weeks Clean Check Valves, page 27 Lubrication See Accessories on page 53 to order lubricant. Liberally lubricate all o-rings, seals, and threads.
Maintenance 4. Use a grease gun with the required synthetic grease, part 117773, to purge the gun body until grease exits the weep hole without evidence of foreign material. 4. Install flush hoses to flush manifold 15B817. See FIG. 16. Install flush manifold onto gun. Torque flush manifold bolt to 20-30 in-lb (2.26-3.39 N•m). TI2647a FIG. 16: Flush Manifold ti19566a 5. Use a 5/32 in. allen key to install the weep plug. 5.
Maintenance Clean Outside of Gun Clean Fluid Manifold The solvents listed in this section may ignite if used in flushing. Use them only for external cleaning. Fluid Manifold Fluid Ports Wipe the outside of the gun with a compatible solvent. See materials of construction info in Technical Data, page 55. Use N-Methylpyrrolidone (NMP), Dynasolve CU-6, Dzolv, or an equivalent solvent to soften cured material. Applying a light coat of lubricant will make future cleaning easier. TI2411a FIG.
Maintenance Clean Check Valves 6. Use flat tip screwdriver to pry out check valves at notch. 1. Follow Pressure Relief Procedure, page 22. 2. Flush Gun, page 25. 3. Disconnect air quick coupler (AC). Use hex nut driver to remove fluid manifold (AD). ti19569a Damaged check valve o-rings may result in external leakage. Replace o-rings if worn or damaged. AD AC ti19568a 4. Disconnect signal cable. 7. Press on ball (BC) to test check valve for proper movement and spring action.
Maintenance 11. Use hex nut driver to install fluid manifold (AD). Torque fluid manifold bolt to 20-30 in-lb (2.26-3.39 N•m). Connect air quick coupler (AC). 2. Use 5/16 in. nut driver (supplied) to remove orifices (C). See FIG. 4 on page 16. NOTICE To prevent cross-contamination of the orifices do not interchange A component and B component parts. The A component orifice is marked with an A. AK 3. Remove Front End, see page 31. AD AC ti19571a 4.
Maintenance Clean Orifice Replace Mix Chamber and Front Seal 1. Follow Pressure Relief Procedure on page 22. 2. Use 5/16 in. nut driver (supplied) to remove orifices (C). See FIG. 4 on page 16. 17 NOTICE 18 To prevent cross-contamination of the orifices do not interchange A component and B component parts. The A component orifice is marked with an A. 19 ti19574a NOTE: The cap is held in place with reverse threads. 3. Remove cap (25f) from orifice (25g). 1. Follow Pressure Relief Procedure on page 22.
Repair Repair Tools Required Replace Cartridge Tools required to complete some gun repair procedures: • • • • • • • • • 15/16 in. wrench flat head screwdriver (supplied) 5/16 hex nut driver (supplied) 1/2 in. deep well socket 3/4 in. deep well socket 5/64 in. allen wrench (supplied) 9/64 in. allen wrench 5/32 in. allen wrench Phillips screwdriver The cartridge is necessary for proper operation of the gun. Replacement of the cartridge is unnecessary for the lubrication of the purge rod.
Repair Remove Front End 6. Pull fluid housing away from gun body to remove. If fluid housing cannot be removed perform the following steps. a. Attach air quick coupler. b. Pull and release the trigger or press and release the red button on the solenoid valve. c. Remove fluid housing. NOTICE Proper attachment of front end is critical. Do not operate gun if front end is loose or not snug against body. Improper attachment can cause slow leaks. d. Disconnect air quick coupler. 1.
Repair Disassemble Front End Assemble Front End NOTICE To prevent cross-contamination of the equipment’s wetted parts, never interchange component A (isocyanate) and component B (resin) parts. The gun is shipped with the A side on the left. The fluid manifold, fluid housing, side seal assembly, check valve cartridge, and mix chamber are marked on the A side. NOTICE To prevent cross-contamination of the equipment’s wetted parts, never interchange component A (isocyanate) and component B (resin) parts.
Repair 5. Install check valve assembly. See Clean Check Valves on page 27 for detailed assembly instructions. 6. Push fluid housing flush to the gun body. Rotate fluid housing 45 degrees clockwise to engage fluid housing slots. AK 6. Install orifice components (25). Install orifice cap (25a) and torque to 20-30 in-lb (2.26-3.39 N•m). Repeat for opposite side. 7. See Attach Front End procedure. Attach Front End NOTICE ti19580a Proper attachment of front end is critical.
Repair Pistons and Bulkhead 6. Unscrew piston safety lock assembly and remove. Inspect o-ring and replace if necessary. User should have piston seals kit 24D312 available before performing this procedure. 1. Follow Pressure Relief Procedure, page 22. 2. Use hex nut driver to remove fluid manifold (AD). TI14465a 7. Place 1/2 in. socket on the piston shaft through the front of the gun body. Entering through the rear of the gun body, place a 3/4 in. socket with extension on the rear piston.
Repair 14. Install bulkhead onto piston shaft. Torque to 100-110 in-lb (11.3-12.4 N•m). See Component Identification on page 16. 15. Apply medium strength threadlocker to threads then install rear piston onto piston shaft. Torque to 100-110 in-lb (11.3-12.4 N•m). See Component Identification on page 16. 16. Install piston safety lock. See Component Identification on page 16. 17. Attach Front End, see page 33. Purge Rod 1. Flush Gun, page 25. 2. Follow Pressure Relief Procedure, page 22. 3.
Repair Solenoid Valve 1. Follow Pressure Relief Procedure on page 22. 2. Disconnect air quick coupler (AC). Use hex nut driver to remove fluid manifold (AD). AD AC ti19568a 3. Disconnect electronic cables from solenoid valve and handle (if installed). 4. Use 5/32 in. allen wrench to remove handle mounting plate screws. Remove handle mounting plate and handle. See Component Identification on page 16. 5. Use Phillips screwdriver to remove solenoid valve. Inspect and replace if necessary.
Troubleshooting Troubleshooting Follow Pressure Relief Procedure, page 22, before checking or repairing gun. NOTICE To prevent cross-contamination of the equipment’s wetted parts, never interchange component A (isocyanate) and component B (resin) parts. The gun is shipped with the A side on the left. The fluid manifold, fluid housing, side seal assembly, check valve cartridge, and mix chamber are marked on the A side.
Troubleshooting Problem Cause Burst of air from muffler when gun is Normal triggered Steady air leakage from muffler Damaged air valve Damaged air gasket Damaged piston o-rings Leak between air cylinder and fluid Damaged o-ring housing Material leaking out weep ports in Mix module and rear seal worn fluid housing near air cylinder Material is spraying out of nozzle Flow rate is too high 38 Solution No action required Replace Replace Replace Replace Inspect and replace mix module and rear seal, clean flui
Troubleshooting Electrical Diagram 1 2 4 5 1 1 3 2 MALE 1 2 2 4 2 YE BLACK #2 3 1 5 FEMALE BLACK #1 1 3 4 5 AIR BROWN BLUE 1 1 2 2 3 3 4 4 5 5 4 5 1 1 SWITCH SIGNAL 24VDC COMMON SOLENOID ACTIVATION 4 5 1 3 3 2 MALE 313872N 2 FEMALE MALE 39
Parts Parts 2 Torque to 125-135 in-lb (14.1-15.3 N•m) 16b 3 3 Torque to 20-30 in-lb (2.26-3.39 N•m) 26 1 4 Torque to 100-110 in-lb (11.3-12.4 N•m) 5 Torque to 10-12 in-lb (1.13-1.36 N•m) 3 3 6 Torque to 60-70 in-lb (6.78-7.
Parts Ref 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16a 16b 16c 16e 16g 16h 16t 17 18 19 20 21 22 23 24 25 26 28 29 30 31 32 33 34 35 Part 24D682 24F033 113003 24E864 ◆ 24E972 ◆ 24E973 ◆ 24E974 ◆ 24D295 15T897 188554 313872N Description CYLINDER, machined HOOK, vertical mount assembly SCREW, socket head cap SHAFT, piston, dual PACKING, o-ring PISTON, front PACKING, o-ring BULKHEAD, applicator PACKING, o-ring PISTON, rear O-RING STOP, assy, safety PLUG, air valve PACKING, o-ring PIN, roll ✠ HOUSING, fluid, ass
Parts Ref 36 37 41 43 44 45 46 47 48 49 51 52 54 55 56 Part 24D073 C19980 172479 ▲ 112307 117510 15B772 15B565 117661 117642 118575 222385 ▲ 295598 24D320 **✠ 115719**✠ Description HANDLE, 2k dispense SCREW, cap, socket hd TAG, warning ELBOW, street COUPLER, line, air, 1/4 npt HOSE, air, 18 inch VALVE, ball PIN, vise TOOL, nut driver TOOL, screw driver, 1/8 blade TAG, warning TOOL, wrench, hex CONNECTOR, splitter SCRAPER, assembly PACKING, o-ring, 015 ▲ Replacement Danger and Warning labels, tags and ca
Kits Kits See Maintenance on page 24 and Repair on page 30 for appropriate kit installation procedures. See Complete O-ring Placement Guide on page 52 for o-ring identification help. Series A and B Kits The following kits are for series A and B guns only. Series A and B guns utilize the TSL cartridge for lubrication of the purge rod and the front head assembly does not contain a scraper.
Kits Kit Description 375 Orifice Fluid Housing Seals Parts included in Kit Kit Number Description Qty 24C761 24C766, 24C794 24C804; see Orifice Kits on page 50 Orifice Housing 1 O-Ring 1 O-Ring 1 O-Ring 1 Needle 1 Backup Ring 1 O-Ring 1 Orifice Cap 1 Orifice Spacer 1 Cleanout Drill 1 Housing Outer O-Ring 1 Housing Inner O-Ring 1 24D313 Outer Fluid Housing O-Ring Kit 24E611 O-Ring 6 375 Lip Seal 24D325 375 Lip Seal 6 Illustration 16g 16h 16g 22 TSL Check Valve Kit
Kits All Series Kits The following kits are for all series EP guns.
Kits Kit Description Orifice O-Ring Kit Parts included in Kit Kit Number Description Qty 248128 6 O-Ring Illustration 25a 25a Iso Check Valve Check Valve 246731 246352 Check Valve Housing 1 Spring Retaining Screw 1 Carbide Ball 1 Filter 1 Check Valve Spring 1 O-Ring 1 O-Ring 1 Check Valve Housing 1 Spring Retaining Screw 1 Carbide Ball 1 Filter 1 Check Valve Spring 1 O-Ring 1 O-Ring 1 40 Mesh Filter Kit (40 mesh, 0.015 in.
Kits Kit Description Parts included in Kit Kit Number Description Qty Check Valve O-Ring Kit 248129 O-Ring 6 Check Valve Face O-Ring Kit 248133 O-Ring 6 Inner Fluid Housing O-Ring Kit 256773 O-Ring 6 250 Lip Seal 24E252 Piston Seals Illustration 16h 24D312 250 Lip Seal 6 O-Ring 6 Rod O-Ring 3 Front Piston O-Ring 1 Bulkhead O-Ring 1 Rear Piston O-Ring 1 22 20 5 5 7 9 11 5 313872N 47
Kits Kit Description Parts included in Kit Kit Number Description Piston Safety 24D295 Stop Stop Shaft O-Ring Kit 257425 Qty Back Cap 1 O-Ring 1 Piston Stop 1 Safety Stop Shaft 1 O-Ring 1 Spring 1 O-Ring 6 Illustration Located inside back cap Handle Trigger Switch Harness EP Solenoid Conversion (Required for components prior to October 2011) 48 24D073 24D049 24M123 2K Electric Handle 1 Handle Mounting Screw 4 Trigger Switch 1 Switch Spacer 1 Air Valve Plug 1 Strain Rel
Kits Series C Kits The following kits are for series C guns only. Series C guns do not utilize the TSL cartridge for lubrication of the purge rod and the front head assembly does contain a scraper.
Kits Orifice Kits In the following table, shaded rows indicate “Super Standard” items that are typically stocked and provide the best delivery dates. Impingement Port Size Kit Type and Kit Number in. mm 250 Model Polyol Orifice Kit 250 Model Iso Orifice Kit 0.016 0.41 24C805 24D229 0.020 0.51 24C751 24D223 0.024 0.61 24C806 24D230 0.028 0.71 24C807 24D231 0.031 0.79 24C752 24D224 0.035 0.89 24C808 24D232 0.039 0.99 24C809 24D233 0.042 1.07 24C810 24D234 0.047 1.
Kits Drill Bit Kits For cleaning fluid housing passages and orifices. Drill bit illustrations are actual size for comparison. See Clean Fluid Housing Passages on page 28. Not all sizes are used with every gun model. Orifice Size Kit Number Drill Bit Size Qty in Kit in. mm 24D289 #78 6 0.016 0.41 246631 #76 6 0.020 0.51 246815 #73 6 0.024 0.61 248892 #70 6 0.028 0.71 24D293 #68 6 0.031 0.79 24D294 #65 6 0.035 0.89 248640 #61 6 0.039 0.99 246629 #58 6 0.042 1.
Kits Complete O-ring Placement Guide The following illustration shows all gun o-rings at actual size. See Kits on page 43 for o-ring kit details including quantities of each o-ring in each kit. See Parts on page 40 for part references and locations.
Accessories Accessories Lubricant for Gun Rebuild Circulation Manifold 246362 NOTICE Use only Throat Seal Liquid on the o-rings, seals, and threads of the cartridge. Fusion grease or other petroleum-based or vegetable-based lubricants will cause cartridge o-rings and seals to swell and stick. Attaches to gun fluid manifold to enable preheating of hose. See manual 309818. 248279, 4 oz (113 gram) [10] High adhesion, water resistant, lithium-based lubricant. MSDS sheet available at www.graco.com.
Accessories Solvent Flush Canister Kit Grease Cartridge for Gun Shutdown 248139, 1 qt (0.95 liter) Solvent Cup Includes flushing manifold to flush gun with solvent. Portable for remote flushing. See manual 309963. 248280 Cartridge, 3 oz [10] Specially formulated low viscosity grease flows easily through gun passages, to prevent two-component curing and keep fluid passages clean. ti19567a Solvent Flush Pail Kit 248229, 5.0 gal.
Technical Data Technical Data Maximum Fluid Working Pressure . . . . . . . . . . . . . . . . Minimum Air Inlet Pressure. . . . . . . . . . . . . . . . . . . . . . Maximum Air Inlet Pressure . . . . . . . . . . . . . . . . . . . . . Maximum Fluid Temperature . . . . . . . . . . . . . . . . . . . . Air Inlet Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A Component Inlet Size . . . . . . . . . . . . . . . . . . . . . . . . B Component Inlet Size . . . . . . . . . . . . . . . . . . .
Technical Data Dimensions % & $ Side View ' ( Bottom View ti19587a Ref Dimension, in. (mm) A B C D E F 56 10.8 (274) 11.7 (297) 6.1 (155) 3.1 (79) 0.73 (19) 1.
Technical Data 313872N 57
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.