Re: Impeller – key vs pin to shaft

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January 22, 2016 at 1:04 am #30490
frankr
Participant

    If you are comparing the round pin shaft (33hp) to a woodruff key shaft (40hp), the 40hp has a thicker impeller (taller). That means more friction and harder to turn. I guess the engineers felt it needed a stronger key to do it.