[FONT=Arial]I just replaced the lower drain impeller (154365401) on the dishwasher.When I tried putting the volute cover (154365302) back onto the pump housing (154364802) I notice that It doesn’t quite sit the right way. When I put the pump slinger (154365501) on and then the pump housing cover (154365201) I notice the the shaft is not centered. The pump will run at this point but will not pump out water because the four pump housing screws are not inst alled. When I install the upper impeller (154370601) and the diffuser (154367402) and install and tighten the four long screws, the pump will not run at all. 
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1/8/13
Found that the collar on top of the lower drain impeller that had broken off the original impeller, stayed on the shaft and was sitting on top of the seal. When I tried to install new impeller, I never noticed it (both pieces, the shaft and the piece of the collar being white) and when it bottomed out, it was sitting too high to enable the volute cover to seat properly