Deck is 48" 3 blade and they seem to cut at different levels,
Ask on these two forums
http://www.mytractorforum.com/12-john-deere-forum http://www.tractorbynet.com/forums/john-deere
SOURCE: I sharpened the blades at the end of last mowing
The problem you discribe is the classic broken blade spindle or quill. The tube that supports the bearings between the deck pulleys and the blades is almost certainly broken. Look under the deck [mower OFF] at the piece right above the blade that is malfunctioning and you will probably find a bad bearing or a chunk of the tube that holds the bearing/blade to be missing. That happens when the blade gets 'wacked'. The outer edge is cutting too high because the belt is pulling the shaft toward the center of the deck. The quills are fairly easy to replace. Get the model number off your tractor before you go to buy the part.
SOURCE: can't level deck.
try checking the blade spindle to see if there is any play (up,down,left,right) hope this helps
SOURCE: I am working with a Murray MTD Pro 42
try this link it may helphttp://manuals.mtdproducts.com/mtd/public/list.jsp?BrandCode=10451
SOURCE: Mower Deck not level
there is a geared bolt at the deck suspension un lock it and rotate it will raise and lower the deck
SOURCE: 42" deck not cutting level
I had a similar problem, and the problem was fixed by airing up one of my front tires. This may not be all of the problem, but you should eliminate this before you go adjusting.......
Just a thought, --W/D--
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