Small Engines (Lawn Mowers, etc.): Blade not turning in mower, woodruff key, assembly drawings

Question
I have a
Toro,  22" , front drive,  6.5 HP Recycler mower
Model: 20016
SN: 220338372

At the end of the season last year, the mower started to vibrate, then the blade stopped turning  at the speed of the engine. ( It did not strike anything.) I examined it, confirmed that the blade is loose and  is turning independently of the shaft. I see no evidence of a "key way".

The shaft seems to be still fixed in place to/in the engine.

What's the likely diagnosis?

Thank you for your consideration.


Answer
Hello Henry:

You can View a Breakdown/IPL of the Mower at this Site Addy, https://lookup3.toro.com/partdex/default.cfm and Select Start Parts Viewer. Now Enter the Model Numbers (20016). Now Select View Assembly Drawings of the 2002 Year Model Mower. Now Select the Engine and Blade File. If this Engine has No Key-Way in the Crankshaft for a Woodruff Key or Square Key Stock, then it has a Spacer/Retainer Inside the Blade Adapter and the Blade is Held Tight Using Torque on the Blade Bolt and the Spacer/Retainer. If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John

Hello Again Henry:

I Failed to Explain that this was a Design Change for the Blade Adapter that is Supposed to Help Prevent Crankshafts from Bending when the Blade Contacts a Hard Object. Thanks for the Ratings and the Comments. Till Next Time. May All Your Mechanical Problems be SMALL ONES and May the All Mighty Bless You and Yours. Thanks Again.

Best Wishes and Good Luck

Respectfully

John