TM 5-4320-300-145-21. IMPELLER, SHAFT, SEALS, AND CHECK VALVE (CONT)Location/ItemActionRemarksNOTEIf the same impeller and wear plate are reassembled and no clearancechange is indicated, make sure that the same thickness of shims is used.If a new impeller and/or wear plate is to be installed, or if the impellerclearance is to be changed, determine the shim thickness required toobtain a clearance of 0.010 to 0.020 inch (0.254 to 0.508 mm) between theimpeller and wear plate as follows:a.Install impeller on shaft without shims. Be sure that it is seated firmlyagainst the shaft shoulder.b.Install volute with wear plate assembled, and secure with attachingbolts and lockwashers.c.Measure from the face of the impeller to the face of the wear plateusing a feeler gage.d.Select shims to equal the dimension obtained less 0.010 to 0.020 inc h(0.254 to 0.508 mm) for clearance.23. ImpellerPut Woodruff key into slot in shaft and installimpeller. Install and tighten locking cone.24. Volute andFasten wear plate to volute with countersunkwear platescrews. Install on seal plate with bolts. Tightensecurely. Install new volute gasket on outside ofvolute.25. BearingInstall on pump body. Install mounting nuts andhousinglockwashers, and tighten securely.26. Valve seat andInstall on suction flange.check valveassembly27. Suction portInstall new gasket, companion flange, and mount-companioning nuts. Tighten nuts securely in an alternatingflangepattern.5-87
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