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DIESEL <br /> Maintenance Inspecting/Verifying 95% Level (Without <br /> The 708-590 Series Overfill Prevention Valve has no Removing from Tank) <br /> periodic maintenance requirements. FOR DIMENSIONS"A" $ "B"i Refer to the"installation <br /> However, if the drop tube and valve assembly is removed record sheet"or re-measure and re-calculate per figure 1. <br /> from the tank (for inspection or service), inspect the <br /> drop tube seal for wear/damage(Figure 16). Replace if 1. Measure Dimension "Z" (Figure 18) <br /> necessary. <br /> „Z„ ( r (Upper drop tube flange to <br /> ANN" b b edge of upper tube adapter) <br /> �., 2. Verify using the calculation below <br /> «A„ <br /> (Drop tube seal surface to <br /> - - bottom of tank) <br /> rt - (Subtract) <br /> Drop Tube Gasket Installed „B„ I J (95%Volume from tank chart) <br /> (note orientation) J <br /> � - (Subtract) <br /> ( <br /> 4.5" (114mm) 95%Shutoff level offset) <br /> Figure 18:Inspect Gasket - (Equals) <br /> Additionally, if the upper or lower drop tube is <br /> unthreaded/removed from the OPV, the O-ring(s) should <br /> be replaced (Figure 17). Same value as "Z" <br /> indicates correct installation <br /> Inspect O-ring <br /> 1 <br /> I Measure <br /> i I <br /> I <br /> 3 <br /> I � 1 <br /> I 3 <br /> 41/211 <br /> (114 mm) <br /> f V <br /> Inspect C-ring�t <br /> Figure 17:lnpect O-Rings Figure 18:Dimension Verification After installation <br />