Mower blade adapter key

silvermouseApril 9, 2010

I failed to put the hardened washer and lock washer on when I replaced the blade on my sp mower. The blade adapter broke (big chunk around the key) and I finally found a replacement adapter. The key is the circle sector type and I need to know if the flat part goes into the motor shaft keyway or into the blade adapter keyway. I have new washers and will never forget to put them on again. Thanks for your help.

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Your problem is not clear, as to the "circle key". What do you mean by this? Most blade adapters have either a separate square key, or a key formed inside the crankshaft hole of the adapter. You must have a key that fits in both the crankshaft and the blade adaptor, at the same time. Did you get the correct adapter, or just find one lying about?

    Bookmark   April 9, 2010 at 1:54PM
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I finally found the name for the type key that's required. It's a Woodruff key. My thinking is that the flat side of the key should go into the adapter keyway and the rounded side into the shaft keyway, but I'm not sure.

    Bookmark   April 9, 2010 at 4:31PM
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Your thinking is correct- provided it is the right style key for the shaft...

    Bookmark   April 10, 2010 at 12:12AM
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Thanks, guys!!

    Bookmark   April 10, 2010 at 8:41AM
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