In article ,
"P & H Macguire" writes:
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| Maybe the blade is out of balance?

A blade that is out of balance or not centralised is the most likely
answer, and easiest to deal with. Take the blade out, stick a thin
knife through the hole and see how it balances. If it doesn't, file
or grind it down until it does. If it does, check that the blade is
properly central on the shaft, and there is no play between it and
the shaft.

If neither are the case, then the bearings may well be on the way
out. Regrettably, nowadays, the simplest solution is to buy a new
mower. A petrol one may be worth having repaired; and electric one
definitely isn't.


Regards,
Nick Maclaren.