Hello
The person who wrote about hammering the flywheel is correct,you must also
never hit the top of the crankshaft where the nut is.The reason...the
threads on the top will pean over and or you can break off the threads
making your lawnmower into a very expesive paperweight
also never use a 3 armed puller on the flywheel it will only break your
flywheel.
depending on the type of engine (you said toro)that is the make of
lawnmower deck not the engine.
you must make an effort to see and get the model number--ie;briggs&stratton
100902 or tecumseh Lev80
then with the proper text book and the proper tool you can learn how to do
this simple repair.
one last thing,the blade hub the part that the blade connects to has on
some models a half moon key known as a woodruff key that could also bee
sheared.inanycase please remove the spark plug before attempting any
repair.
hoping this is helpfull.
larry the small engine mechanic