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Manafacture: Graco Inc.
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File name: 43219660-619e-472e-bef7-0790d5d304f4.pdf
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manual abstract
. Operation Pressure Relief Procedure Using the Gun WARNING INJECTION HAZARD The system pressure must be manually relieved to prevent the system from starting or dispensing accidentally. Fluid under high pressure can be injected through the skin and cause serious injury. To reduce the risk of an injury from injection, splashing fluid, or moving parts, follow the Pressure Relief Procedure whenever you: . are instructed to relieve the pressure, . stop dispensing, . check or service any of the system equipment, . or install or clean the nozzle. 1. Lock the gun trigger safety by fully releasing the trigger. 2. Disconnect the power source. 3. Hold a metal part of the gun firmly to the side of a grounded metal pail. Unlock the gun trigger safety by pushing it in as you trigger the gun to relieve pressure. 4. Lock the gun trigger safety by fully releasing the trigger. 5. Open the pump drain valve (required in your system) to help relieve pressure in the pump, hose, and gun. Triggering the gun to relieve pressure may not be sufficient. Have a container ready to catch the drainage. 6. Leave the drain valve open until you are ready to dispense again. If you suspect that the nozzle or hose is completely clogged, or that pressure has not been fully relieved after following the steps above,very slowlyloosen the hose end coupling and relieve pressure gradually, then loosen completely. Now clear the nozzle or hose. Tolock the gun’s trigger safety,fully release the trigger. To unlock the gun’s trigger safety,push it in as you squeeze the trigger. See Fig. 1. To dispense fluid with the gun,start the supply pump and squeeze the trigger in all the way. Fluid flow begins with the slightest pressure and stops when the trigger is released. Fluid flow rate is controlled at the pump. Adjust the pump speed to obtain the desired flow rate; use the lowest pressure necessary. The pressure adjustment will depend on the hose length, the viscosity of the fluid, and the nozzle size. 1 2 Inspect for build-up of fluid, which could indicate internal leak. 3/16” (3.18 mm) free play. Trigger Safety 1/2 npt(f) Vent 1 2 . Fig. 1 . Notes . Service NOTE: The numbers in parentheses in the text refer to reference numbers in the parts drawing on page 8. NOTE: Periodically inspect the vent in the gun handle for build-up of fluid, which could indicate an internal leak. See Fig. 1. Service the valve needle and packing as needed. Valve Seat and Needle Replacement WARNING To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 5. If fluid continues to flow after the trigger is released, the gun valve may be obstructed or need adjustment. The valve stem (3) or valve seat (2) may be worn or damaged. Adjusting the Valve 1. Relieve the pressure. 2. Squeeze the gun trigger. Remove the valve seat (2). Let the spring (8) push the valve stem (3) forward, and then loosen the nut (4). 3. Remove the actuating pin (24), then turn the adjusting nut (21) out a couple of turns. 4. Reassemble the gun and check the free travel of the trigger. It should be approximately 3/16 inch (3.18 mm). See Fig. 1. 5. Repeat the procedure turning the adjusting nut as needed, until the correct free travel is obtained. Adjusting the Spring Tension 1. Relieve the pressure. 2. Turn the spring tension adjusting screw (19) so the spring (8) is completely compressed when the trigger (17) is squeezed in all the way. Inspecting the Valve for Obstruction or Damage 1. Relieve the pressure. 2. Disconnect the gun from the hose. 3. Disassemble the gun, then clean and inspect the parts. CAUTION Be sure to squeeze the trigger when removing the valve seat (2). Handle the valve seat (2) and valve stem (3) carefully to avoid damaging the hard carbide portion of these parts. 4. Replace any worn or damaged parts and reassemble the gun. Adjust the free travel of the trigger as instructed in Adjusting the Valve,at left. LUBRICATION NOTE: Apply thread lubricant when installing the valve seat (2), adjusting screw (19), or tube (20). TORQUE NOTE: When assembling the valve seat (2), packing housing (23), or tube (20) to the gun body (14), torque them to 100 in-lb (11 Nm). Valve Needle and Packing Service WARNING To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 5. If fluid leaks past the v-block packing (7), the packing housing (23) may be loose, or the v-block packing or valve stem (3) may be worn or damaged. Tighten the packing housing. If it still leaks, relieve the pressure and disconnect the hose from the gun. Disassemble the gun and replace the v-block packing. When reassembling, lubricate the v-block packing (7) and spring (8) with general purpose grease. CAUTION When tightening the bushing (22), be sure to grip the gun body (14), not the handle (15). This reduces the chance of loosening the connections and damaging the gun. . Parts 13 16...