If you raise the deck to its top position as Sears instructions say it may not be hanging freely and you will not be able to get accurate measurements. For the heck of it I lowered mine to my normal mowing level (4) after following their instructions and found the deck to be way out of level. I leveled it at that height and it mows fine now.
2004 Ariens 11528LE, Troybilt Horse "Big Red" Tiller (original), Troybilt Tuffy Tiller (original), Sears LT1000 mower, Lawn Boy 7073 21" mower, Stihl FS55 RC trimmer, Poulan Countervibe 3400 chainsaw