I have two recently acquired G1800's with 48" decks. Both decks are out of whack on the height adjustment, with the front rollers on the ground and digging little trenches. I was able to properly adjust the front links on one of them to suspend the front of the deck about 3/4" off the ground...
Just acquired a G1800 with 48" mower deck. The center blade cuts lower than the outer two blades. I measured the blade height under the deck and the center blade is 5/8" lower than the outer blades. It does not appear to be installed incorrectly. The mower deck is way out of whack adjustment...