Graco 236-288 Instructions-Parts List Manual

Foam dispense gun

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INSTRUCTIONS–PARTS LIST

INSTRUCTIONS

Foam Dispense Gun

150 psi (10 bar) Minimum Dynamic Working Air Pressure

180 psi (12 bar) Maximum Working Air Pressure

950 psi (66 bar) Maximum Working Fluid Pressure

Model 236–288, Series A

Includes a 0.215 in. (5.46 mm) diameter needle/nozzle assembly

Vsupply: +20 to 24 VDC

Imax: 50 mA

IMPORTANT!

This gun is intended for use only with the

Graco Shot Foam System to assure that

proper grounding and other safety devices

are in place.

U.S. Patent D346,729; 5,348,230

R.O.C. Patent 159444

Additional patent pending

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

This manual contains important

warnings and information.

READ AND RETAIN FOR REFERENCE

308–316

Rev. D

Supersedes B

and PCN C

Table of Contents

Summary of Contents for Graco 236-288

Page 1 This gun is intended for use only with the Graco Shot Foam System to assure that proper grounding and other safety devices are in place. U.S. Patent D346,729; 5,348,230 R.O.C. Patent 159444 Additional patent pending GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 COPYRIGHT 1994, GRACO INC.
Page 2 Symbols Warning Symbol Caution Symbol WARNING CAUTION his symbol alerts you to the possibility of serious This symbol alerts you to the possibility of damage to injury or death if you do not follow the instructions. or destruction of equipment if you do not follow the instructions.
Page 3 Route the hoses away from the traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose Graco hoses to temperatures above 180 F (82 C) or below –40 F (–40 C). Use fluids or solvents that are compatible with the equipment wetted parts. See the Technical Data section of all the equipment manuals.
Page 4: Table Of Contents
......Graco Phone Numbers ..... . .
Page 5: Terms
2. Pump: connect a ground wire and clamp to a true earth ground as shown in your separate pump manual. 3. Fluid hoses: use only Graco heated hoses, which are electrically conductive. Fig. 1 4. Air hoses: use only grounded air hoses.
Page 6: Connecting The Hoses
RES to RES connections. See Fig. 2. Cross- You need a solvent flushing system to clean the nozzle ing fluid can damage the hoses and gun. Refer to head assembly. See the Graco Shot Foam System the Graco Shot Foam System manual. manual for the flushing procedure.
Page 7: Operation
See Fig. 3. Follow the startup procedure in the Graco Shot Foam System manual. A general startup procedure is pro- T o lock the piston rod safety and make the gun inop-...
Page 8 3. Allow the fluid to heat thoroughly, head (4) with a dry cloth. See Fig. 4. To im- as recommended by the Graco Shot Foam System prove nozzle life, use a cloth dampened with manual and the material supplier. If the gun has gun cleaning solution when cleaning the gun.
Page 9: Maintenance
Maintenance Lubricating Parts The needle sticks in the closed position for a moment before opening. The foam gun may recoil Two types of grease are used with this gun: slightly when this happens. Once detected, this condition will progressively worsen until the needle freezes completely.
Page 10: Needle/Nozzle Assembly Repair Or
Maintenance Needle/Nozzle Assembly Repair or Replacement WARNING INJECTION AND HOT MATERIAL HAZARDS To reduce the risk of serious injury from fluid injection or contact with hot material: Lock the piston rod safety whenever you stop dispensing. Close the fluid manifold needle valves completely with the nut driver provided before servicing the gun;...
Page 11 Fig. 10 7. Take the nozzle head assembly (4, 5) to a flushing station for cleaning. See the flushing procedure in the Graco Shot Foam System manual for specific flushing instructions. NOTE: The gun body can remain on the produc- tion line if no foam buildup is visible on the piston.
Page 12 (5b) with 1.4 11. Pull the nozzle retainer (5b) with the end cap (5a) to 1.5 cc of ISO grease (Graco part no. 106–565) . off of the needle/nozzle (5d). Refer to Fig. 13.
Page 13 Maintenance Needle/Nozzle Assembly Repair or Replacement (continued) Check Valve Maintenance The nozzle head check valve needs periodic mainte- nance as the foam material can build up in this area and cause pressure variations. In extreme cases, ma- terial cross-over may occur. Service the check valve as instructed below whenever you repair or replace a needle/nozzle assembly.
Page 14: Air Valve Piston And Spool Maintenance
Maintenance Needle/Nozzle Assembly Repair or Replacement (continued) 30. Tighten the two nozzle head screws (4e) to 4.5 to 6.5 ft-lb (6.1 to 8.8 N m). See Fig. 19. WARNING INJECTION AND HOT MATERIAL HAZARDS To avoid serious injury and property damage, be sure the two nozzle head screws (4e) are properly tightened to 4.5 to 6.5 ft-lb (6.1 to 8.8 N m).
Page 15: Troubleshooting
Troubleshooting WARNING INJECTION AND HOT MATERIAL HAZARDS To reduce the risk of serious injury from fluid injection or contact with hot material: Lock the piston rod safety whenever you stop dispensing. Close the fluid manifold needle valves completely with the nut driver provided before servicing the gun; this will isolate the fluid pressure in the manifold and fluid hose.
Page 16 Troubleshooting PROBLEM CAUSE SOLUTION 1. Inbound air pressure is too high 1. Decrease air pressure, do not exceed Gun is slow to de-trigger. NOTE: 180 psi (12 bar) Maximum Working Over-shoot in excess of preset toler- Air Pressure. ance may cause system to lock-out. 2.
Page 17: Service
Service Lubricating Parts Tools Included with the Gun Two types of grease are used with this gun: ISO grease (part no. 106–565) is packed inside the nozzle retainer reservoir as it is compatible with the isocyanate material. Lithium grease is used to lubricate o-rings. Tools The following tools are supplied with the gun (see Fig.
Page 18: Removing The Gun From The Production Line
Service Removing the Gun from the Production Line 6. To disconnect the gun body and nozzle head assembly from the production line, loosen the one NOTE: The gun must be removed from the production fluid manifold screw (3b) with the wrench (47), and line for most service procedures.
Page 19 8. Insert the quick-disconnect hook (50) into the slot station for cleaning as needed. See the flushing on the gun body neck. Hook the quick-disconnect procedure in the Graco Shot Foam System sleeve, and pull it back toward the rear of the gun manual.
Page 20: Solenoid Valve
Service Solenoid Valve 8. Connect the solenoid connectors (J). See Fig. 28. NOTE: One connector lead is longer for easier Slow operation of the gun, failure to operate, or air connection to the farthest contact. leakage through the exhaust holes when the gun is untriggered may indicate a solenoid valve failure.
Page 21: Receptacle Assembly
Service Receptacle Assembly 8. Securely fasten the ground wire eyelet (N) to the cover (2a) with the lock washer (2d) and ground screw (2e). See Fig. 30 and 31. WARNING INJECTION, FIRE, EXPLOSION, AND WARNING ELECTRIC SHOCK HAZARDS Replace the receptacle assembly (2b) FIRE, EXPLOSION, AND ELECTRIC whenever any visible damage occurs to SHOCK HAZARD...
Page 22: Air Valve Piston Assembly
Service Air Valve Piston Assembly 5. Inspect the piston o-rings (32, 33) for wear. See Fig. 34. If the o-rings are worn, replace them. WARNING NOTE: The internal piston o-rings should be inspected every 1 to 1.5 million cycles. See page 23. INJECTION AND HOT MATERIAL HAZARDS 6.
Page 23 Service Air Valve Piston Assembly (continued) Install the Piston Assembly 12. Lubricate the areas specified in Fig. 34 and 36 with Quick-Disconnect and Internal Piston O-Rings lithium grease. 7. If the piston rod/quick-disconnect (6) has failed, clean the foam material off the parts. If this does 13.
Page 24: Piston Rod Safety
Service Piston Rod Safety CAUTION WARNING Install the set screw flush with the piston bore. Do not tighten the set screw to bottom as this will INJECTION AND HOT MATERIAL make the safety difficult to slide. However, if the HAZARDS set screw is not inserted far enough, it will protrude into the piston operating area and affect the pis- To reduce the risk of serious injury from...
Page 25: Air Valve Spool Assembly
Service Air Valve Spool Assembly 6. Lubricate the areas specified in Fig. 40 with lithium grease. WARNING 7. If no further service is required, go to step 17 to reinstall the spool assembly. INJECTION AND HOT MATERIAL HAZARDS The piston and spool o-rings must be lubricated approximately every 100,000 cycles to reduce the risk of piston failure.
Page 26 Service Air Valve Spool Assembly (continued) 14. Replace all the o-rings. Lubricate them with lithium grease and use the air valve hook (CC) to guide Internal Spool O-Rings and Spacers the o-rings into the spool cavity and to make sure they seat flatly.
Page 27: Trigger Switch
Service Air Valve Spool Assembly (continued) 2. Remove the screws (39) and cover (2a) from the back of the gun. See Fig. 43. Install the Spool Assembly NOTE: Removing the cover will unplug the trigger 17. Install the spool assembly (7) into the gun body. switch electrical connector (Q) and may cause the spool return spring (7a) to fall out of place.
Page 28: Assemble The Gun
Service Assemble the Gun 8. Tighten the two nozzle head screws (4e) to 4.5 to 6.5 ft-lb (6.1 to 8.8 N m). See Fig. 46, page 29. 1. Hold the cover (2a) up to the back of the gun and insert the trigger switch connector (Q) into the WARNING receptacle connector (S).
Page 29: Install The Gun On The Production Line
Service Install the Gun on the Production Line CAUTION 1. Make sure the piston rod safety (C) is locked and When opening the fluid manifold needle valves the fluid manifold needle valves (3a) are closed. (3a), open the RES side first, then open the ISO See Fig.
Page 30: Manifold Needle Valves Replacement
To reduce the risk of serious injury from fluid injection or contact with hot materi- al, relieve the system pressures as instructed in the Graco Shot Foam System manual before removing the ISO or RES supply lines or servicing the man- ifold or the needle valves.
Page 31 9. Open the fluid manifold needle valve (3a) for the RES side first, then open the ISO side. (continued) CAUTION 7. Follow the instructions in the Graco Shot Foam System manual to bleed off any air in the fluid When opening the fluid manifold needle valves lines.
Page 32: Parts
Parts Included with item 7 not available separately Ref. 9 See DETAIL Item 1, Gun Body Assembly Includes items 1a–1e Item 2, Gun Cover Assembly Includes items 2a, 2b, 2d, 2e Item 3, Manifold Assembly Includes items 3a–3d Item 4, Nozzle Head Assembly Includes items 4a–4e Item 5, Needle/Nozzle Assembly Includes items 5a–5e...
Page 33 Parts Use Only Genuine Graco Parts and Accessories Model 236–288, Series A Includes items 1–54 Ref. Ref. Part No. Description Qty. Part No. Description Qty. 236–658 GUN BODY 189–005 TRIGGER 189–886 SAFETY SLIDE 189–015 ACTUATOR PIN, trigger 189–887 SAFETY CAP 189–055...
Page 34: Accessories
7a, to state that it sits loosely in the spool rather than being seated. Graco Phone Numbers TO PLACE AN ORDER , contact your Graco distrib- utor, or call this number to identify the distributor closest to you: Phone: 1–800–367–4023 Toll Free FOR TECHNICAL ASSIST ANCE,...
Page 35: Technical Data
Technical Data Maximum Working Fluid Pressure . . . 950 psi (66 bar) Wetted Parts ..17–4 pH Stainless Steel, Carbon Steel, Brass, Ethlene Propylene, Maximum Working Air Pressure ..180 psi (12 bar) Delrin , PEEK, Viton , PTFE, Maximum Working Fluid Temperature 180 F (82 C)
Page 36: Warranty
Graco distributor to the original purchaser for use. As purchaser’s sole remedy for breach of this warranty, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment proven defec- tive.