Évaluations - 3, GPA: 3.7 ( )

Fabricant : Graco Inc. Taille : 250.11 kb Nom Fichier : Langue d'enseignement:

Now clear the needle or hose. Electric Switch Hand Held Valve . Be sure the air supply lines are connected correctly to the OPEN and CLOSE valve air ports. . To open or close the valve and maintain the open or closed status, a minimum of 40 psi (280 kPa, 2.8 bar) air pressure must be supplied and maintained at the OPEN or CLOSE port. . The trigger only activates the electrical switch in the handle, which turns the remote solenoid on and off. . Trigger the gun to turn the solenoid on. Release the trigger to turn the solenoid off. Machine Mount Valve . Be sure the air supply lines are connected correctly to the OPEN and CLOSE valve air ports. . To open or close the valve and maintain the open or closed status, a minimum of 40 psi (280 kPa, 2.8 bar) air pressure must be supplied and maintained at the OPEN or CLOSE port. To open the valve: 1. Apply air pressure to the OPEN air port on the valve, and remove air pressure from the CLOSE air port on the valve. 2. Maintain air pressure on the OPEN air port to keep the valve open. To close the valve: 1. Apply air pressure to the CLOSE air port on the valve, and remove air pressure from the OPEN air port on the valve. 2. Maintain air pressure to the CLOSE air port to keep the valve closed. 8 308876 Operation Air Switch Hand Held Valve The valve operation is such that there are only two valve conditions: either fully open or fully closed. The valve is opened and closed by the internal air control valve. Trigger the gun to open the valve. Release the trigger to close the valve. Shaft Stroke Adjustment (Models 965766, 965767, 965768, and 965786 only) Adjust the shaft stroke to balance the valve between “snuff-back” and “push-out”. . A long stroke will give maximum snuff-back but it may cause push-out when the valve opens. . Shortening the stroke of the shaft will minimize the material pushed out when the valve opens and will also increase the material back pressure through the valve. To adjust the shaft stroke: 1. Loosen the hex nut (44) from the adjustment nut (43). 2. Adjust the nut (44) along the adjustment shaft (42) to the desired position. . The valve is at full stroke when the hex nut (44) is at the end of the adjustment shaft (42). . Adjusting the nut (44) on the shaft (42) towards the valve, or clockwise, will reduce the stroke length. . Adjusting the nut away from the valve, or counterclockwise, will lengthen the stroke. 3. Tighten the hex nut (44) to the adjustment nut (43) to set the adjustment. 42 Shorten Lengthen 44 43 Fig. 4 8460 Maintenance Preventative Maintenance There is a grease filled secondary seal/bearing area on the valve shaft. Every 10,000 cycles, or twice each month, new grease should be flushed across this area. Each valve has two flush grease fittings. A small grease gun is provided with each valve. To grease the valve: 1. Remove the grease fitting from one side of the gun. 2. Pump grease (Part No. 115982) across the valve until clear grease comes out of the other side. 3. Reinstall the grease fitting. 308876 9 Troubleshooting WARNING 1. Relieve the pressure. 2. Check all possible causes to the problem before disassembling the pump. SKIN INJECTION HAZARD To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8. PROBLEM CAUSE SOLUTION Valve does not open Insufficient air pressure Turn on or turn up air pressure. Air not exhausted from behind air cylinder piston Use four-way, relieving-type air valve operator. Shaft adjustment too far closed Adjust the shaft stroke as instructed on page 9. Valve does not close (leaks) Insufficient air pressure Turn on or turn up air pressure. Air not exhausted from behind air cylinder piston Use four-way, relieving-type air valve operator. Blockage between needle and seat Remove and clean needle and seat. Bad or missing gasket between seat and housing Replace gasket (38). Needle worn out Replace needle and seat. Higher than normal back-pressure Nosepiece plugging up Remove and clean. 10 308876 Service (Models 965766, 965767, 965768, and 965786 only) WARNING SKIN INJECTION HAZARD To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8. Disassembly 1. Relieve all air and fluid pressure. 2. Disconnect the valve from the system. 3. Remove the four nosepiece screws (15), and pull the nosepiece (40) away from the valve. Remove the snuff-back ring (41). See Fig. 5, page 14. 4. Use an 1/8 in. pin punch in the needle hole (A) to unscrew the needle (27). If the shaft (3) spins, insert a dowel pin in the shaft hole (B) to hold it steady, then unscrew the needle (27). 5. Remove the seat (25), gasket (38), and o-ring (39). 6. Remove the two fluid housing screws (23) and remove the fluid housing (26). Remove the primary fluid seal (22) from the fluid housing (26). 7. Pull the bearing/lube housing (19) from the air cylinder (1). Remove the bearing (21), bearing ...

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