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Well if you have one of the 9ft shaft drive models like I do here's what I'd check. Pull all the discs off and change the grease in them little gear boxes for starters. It takes EP-0 grease "gear box grease" your local AGCO dealer will have it in the grease gun size tubes etc. They have to filled up to certain level it states it all in the owners manual. Make sure to check all the bearings when its apart. Pull the pto shafts apart and grease the tubes etc and check all U-Joints. Check the backlash on the discs. Sometimes the shaft wears where it runs through the gears along the cutter bar. Older ones like mine don't have as much contact area where the shaft runs through the gear etc. The newer update models were improved etc. Anyway check the back lash if it seems really bad replace the shaft. It pulls out the right side and costs about $100 bucks. Its not a big job and doesn't take very long to do. It explains how to do in the manual. Check the chains and sprokets that hook the top crimper roller to the tension springs. If old hay is left jammed in the corners there where the spocket sits and it rusts they can sieze up etc. Change the oil in the big gear box on the left side it takes standard gear oil. Make sure all the grease zirks take grease. Check the wear plates under the cutter bar. Thats about all I can think of really there isn't much too them. The only real complaint I'd have is replacing that cutter bar grease. It takes a bit of fooling around and is a messy job. I change/check it depending on how many acres I do a year. When I first got it I checked every 2-3 years now I check it every winter in the off season. I have only changed 1 U-joint in all the years we've run which is the one right by the slip clutch. I think I've replaced the cutter bar shaft once or twice and a couple master links on the those tension chains for the crimpers. Oh and last year I replaced the steady bearing on the pto shaft under the front shield there it was getting dry. For all the acres its done I've been real happy with it and would buy another. I pull it with a 95hp tractor but have pulled it fine with a 85hp tractor too. Disc mowers are great machines as long as you don't use it to chop rocks or level fields! Typically I drive 8 MPH with it unless its a really heavy tall crop. A set of blades lasts 400-500 acres as long as you don't have too many mole hills. Too much dirt dulls them in a hurry. We had a 12ft NH sickle haybine before. It was a good old machine too and we cut a lot of hay with it. But in our conditions this little disc mower can cut circles around it and then some. good luck
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