look for the engage switch that has a picture of blades
You can turn it both ways to see how sharp it is.
10w-50
If you have a belt driven blade set up either the belt has jammed the pulley because it is worn out or the belt is broken. It could also be that there is a problem with the pulley's, but this is rare. I agree that the belt is the most likely problem. But there may also be a problem with the cable or linkage that engages the belt. If your belt looks good then have someone try to engage them with the mower not running and see if everything looks like it is moving properly to stretch the belt and engage it. If this is a push mower then the spline on the blade or crankshaft is probably stripped.
A Razor, a lawn mower, and a rollerblade all include a blade. A razor has a blade. A lawnmower has a blade A rollerblade has no actual blade but it has the word blade in its name.
A blown fuse when engaging the PTO (Power Take-Off) on a Gravely zero-turn mower typically indicates an electrical overload or short circuit. This can be caused by a faulty PTO switch, damaged wiring, or a malfunctioning mower deck motor. Additionally, if the blades are jammed or there is excessive resistance, it can also lead to increased current draw, causing the fuse to blow. Regular maintenance and inspection of electrical components can help prevent such issues.
How do you change the blade on a Toro 21" self-propelled mower
if its an electric clutch the solonid that engages it may be bad, if its a manual engagment,the belt may be bad,or a spring has come off,
Usually a short length of 2x4 can be used to wedge and hold the blade to loosen the bolt.
What is better a high lift lawn mower blade or a low lift blade.
The Yardman Series push mower uses a 21 inch blade.
The blade
Most lawn mowers have safety features that will turn the engine off when there is damage to the blade assembly. That is very likely the problem.