It sounds like you have the original Crown head not the Crown II. The Crown II uses a remote pump to supply the flush water and it doesn't have an impeller.
The Crown toilet used a little plastic body, rubber impeller pump mounted on the rear of the motor. The plastic housing can wear out over time and you need to replace the pump.
The part number is CH102MW. The pump still shows in the Raritan price list. It will probably cost about $160.00.
This is the description from the parts list: CROWN HEAD PUMP ASSEMBLY, POST-JAN.1988. How old is the toilet?
Try High Wire's idea before you resort to a new pump.
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Parks Masterson
Retired from Hopkins-Carter Marine Supply
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