Disconnect the battery to avoid start up of the machine. Jack up the front of the machine, there is one nut holding each blade, remove the nut then the blade.
Remove the mower deck from the tractor or securely jack the tractor up so you can get under the mower deck. Remove the nut holding the blade on and replace the blade. Make sure you put the blade on the same way the old one came off.
All you need to do is pick the front end up in the air and take the center bolt out of the blades and they will drop right off then just get the new blades and put them back on your mower.
You might have to take it in to get it replaced. Or you can go to the store and get a manual on the law mower and change the blades yourself. The book will tell you all you need to know on how to change it. Hope this helps you out.
