I just bought a used 48" John Deere walk behind with no manual. I think its an older model, but the model number is worn off and the owner didn't know the year. I am trying to lower the cutting height about a half inch, and can't figure out how to lower the rear end. I got the front to where I want it, but now the wholw mower is slanting forward. Any jd owners out there who can help me out with this?