I've noticed that none of the Deere operators manuals mention sharpening blades. Only replacement. An attempt to sell more blades?
I see what you mean...I pulled one at random from the Deere website (LX5 cutter) and nothing about sharpening I could find...
I have a relatively new Bad Boy ZTR lawn mower. Bad Boy does not recommend sharpening their "fusion hard weld blades," whatever that means.
Service / Maintenance | Bad Boy Mowers
Steve