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Many times the collar is too thick to fit on the shaft behind the fan. If the collar is to thick it will not allow the fan taper to seat properly on the shaft taper. It all depends on where the impeller was set on the shaft. If the two tapers are not tight the fan taper woller out. In Dallas we put them where you have yours for ease of access. Use a Teflon washer between the collar and pump housing.