<!-- from fixya rte -->How do you change blades on 5ft bush hog? - King Kutter Rotary Tiller Pto Bush Hog John Deere Long

Lift The brush hog up and place on blocks or other foundation that wont fall over. disconnect the power take off shaft from the tractor. Now look for two round openings in the middle of the deck one on ether side of the gear box (the thing on the brush hog that the pto shaft from the tractor hooks up to to make it spin there might be a slip clutch on the shaft but go to the box in the middle) Now turn the shaft till you see the blade nuts in the hole These could be castle nuts with a small carter pin locking them so they don't unscrew. Remove the pin and with a large socket set unscrew it from the bolt then knock the press fit bolt down and the blade will come off, do the same to the other blade if you need them both off. To put them back on use something under the blade and bolt to hold it up so you can start the nut then reverse the order and put everything back on. The blade bolt might be stubborn to get out just take something that fits through the access hole like a wood doll or long punch and drive the bolt down till it comes out as it is press fit and is jammed up to keep the bolt from turning, when putting it back on you will need to make it tight so the bolt can repress back in. Be Careful when reaching under to set the blade and bolt back in. There is not much you can mess up it is just a big nut and bolt Just make sure you put the blade on the way it came off if you do one blade or one at a time you can look at the other to see which way it goes.