How do I check the mower deck levelness?

To ensure proper adjustment of your Craftsman Lawn Tractor's mower deck for best cutting results, it should be leveled side-to-side and front-to-back. Side-to-side leveling involves measuring distances ‘A’ on both sides at the bottom edge from the ground; they should be equal or within 1/4 inch. Adjust lift link nuts if necessary to correct any imbalance (Page 21). Front-to-back adjustment requires raising the mower to its highest position, checking that it is approximately 1/8 to 1/2 inch lower at the front compared to the rear (Page 22).