Bruce summed it up well. I would figure on pulling out the cutter bar and checking the knives/sections. You may need to replace some or all. I have the serrated knives in my NH 489 haybine and have never tried to sharpen them, just replace as needed. Back in the day with smooth knives in sickle bar mowers it was common to sharpen the smooth knives with a special stone on a bench grinder. You may have to replace some guards too. If the guards are bent you can straighten them, if broken or badly worn replace them. Remember the guards have a lot to do with cutting performance. Turn the haybine by hand on the reel, make sure it turns free and check the timing of the knives. Also make sure all your hold-downs are adjusted properly .
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