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PREVENTIVE MAINTENANCE Good Valve <br /> Annually,inspect the flapper in the 71 SO to see that it is <br /> open by looking down the drop tube opening (see in- Deflection Shield <br /> spection procedure below). Test the 71 SO drop tube with Poppet <br /> seals with CARB procedure TP-201.1 D. If the drop tube protected <br /> seal passes testing, no further maintenance is required. <br /> If the drop tube fails testing,replace the drop tube seal <br /> with OPW P/N:H 11931 M for 4"Tubes. Re-test the 71 SO <br /> drop tube with CARB procedure TP-201.1 D. The lower -_ <br /> tube o-ring seal OPW P/N: H14840M can also be re- _ <br /> placed. If this does not correct the leak the 71 SO needs <br /> to be replaced. <br /> Bad Valve <br /> FOR TESTABLE MODELS ONLY: The socket adaptor <br /> can be removed and poppet and float movement and Deflection Shield <br /> with Poppet exposed <br /> function inspected without removing the valve. See <br /> Page 17 for full testing details. If replacement parts are <br /> needed for testable models the following items are <br /> available: OPW P/N 206741 Testable Inlet Tube S/A, ' <br /> 206740 Socket Adaptor and Cable Assembly,and 61 SOK <br /> -0001 Float Kit. <br /> CAUTION: Do not insert any foreign object into drop Figure 27 <br /> tube if flapper is in the closed position. For exam- Note: Figure 27 shows poppet location with float arm <br /> ple,a tank level measuring stick. This will damage not activated. <br /> the valve and void the Warranty. ALWAYS check <br /> flapper location before"sticking"the tank. If flap- INSP 4. Inspect the float by lifting upward. The float <br /> per is in the closed position,the tank is either over- should move freely without any binding. See Figure <br /> filled and you need to wait until the liquid level goes 28. <br /> down or the 71 SO is damaged and needs to be re- <br /> placed. <br /> Inspection Procedure to Ensure Proper Operation Open <br /> Note: For testable models valve does not need to be <br /> removed from tank. See page 17 for testable instruc- <br /> tions. <br /> 4 <br /> IW _ <br /> INSP 1. Remove the overfill valve from the tank as de- <br /> scribed in step 26. Float <br /> INSP 2. Visually inspect the valve for damage. Make <br /> sure no debris or foreign objects are in or on the valve. <br /> INSP 3. With the float in the normal (down) position, Figure 28 <br /> visually inspect the valve to ensure the poppet is not <br /> exposed outside the deflection shield. See Figure 27. INSP 5. View down the tube to ensure the poppet is <br /> moving into the flow path when lifting the float. See <br /> Figure 29. <br /> 18 <br />