We use an angle grinder, but we remove the blades from the mower to do it, trying to hold a floppy, rotating blade while you hold the grinder (a job that usually requires 2 hands) is a royal PITA!

If you look under your bush hog there is almost always a single small bolt that goes through the output shaft of the gear box and holds the blade carrier on that shaft. If you undo it, the whole affair just slides down off the shaft.

We then put them vertically in a vice and use the grinder on a 45° to the blade which leaves the grinder in a very natural position, and gives an excellent view of work while directing the sparks up & away from the person doing the work.

If your bush hog has a 'stump jumper' (a round plate under the blades) there should be a hole in ht e upper deck which lets you slide a socket down through to remove the big bolt holding the blades in place.

Either way you do it, it will be easier than sharpening the blades while they're on the machine, that is a nightmare!


Best of luck.

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