I have a new Toro self propelled lawn mower and it is making metal knocking noises.?
We probably have only used it 4 or 5 times on our smaller lawn. We were using it in pretty long grass when it started and we cleaned the grass out, the blade is sturdy and can't see anything that it might be hitting. It almost seems like it might be more in the engine. Any Ideas?

CHECK THE OIL LEVEL NOW.
i would take the mower to be looked at while it’s still underrwarrantyy. check your owners manuel as to where to take it. once thewarrantyy period is up it will then be on you to pay to have it fixed.
that’s a quality mower so don’t hesitate to have it looked at NOW.
If you have oil in it I think it is time to have it checked out by whoever is in the warranty. don’t use it
turn it over and rotate the blade since you were cutting in tall grass ill bet you bent a piece of the sheild underneath it just try to bend back if the blade rubs against it.