Helllo, I recently purchased a 252 and noticed what seems to be a lot of play on the top portion where the engine sits( swing arm?). when i am on the way across someones yard to a stump, the whole top portion sways back and forth quite a bit, and was wondering if this was normal or not. i looked underneath where the hydrolic piston is mounted and the nut seems tight but seems to have some play. Also i noticed the drive chain was very loose so i tightened it up some but not sure how much play to leave in the chain. sometimes the chain seems tighter than other times? Any help would be greatly appreciated. any other info on what i should do for matinance on a used machine is great as well, i will be changing the oil( 10w-30 synthetic?) or non synthetic? engine is a 2012 27hp kohler 391 hours.