John Deere 637 Disk The 637 Disk is a heavy-duty tandem disk harrow designed for primary tillage and seedbed preparation. It features 22"–24" blades with 9" spacing, adjustable gang angles, and hydraulic leveling. It can be equipped with finishing attachments like harrows or rolling baskets.

Size	17 ft
Kind	3-Section Folding
Spacing	9"
Land Area	acres