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