Welded steel spools add protection. Extra-long triple lips on the inner race, combined with a wide seal between the outer race and flange, flex to resist wear, keep dirt out and help maintain lubrication. Bearings are self-aligning and greasable for longer life. And they're backed with a two-year warranty. Either way, these scrapers direct soil and residue backward, rather than up toward the disk gangs where it can interfere with the disking action.
Wheel modules are maintenance-free.
Unlike the joints in other disks that wear over time and distort depth by increasing play in the rockshaft, John Deere disks feature maintenance-free wheel modules. And there's no wear in the joint to affect depth. Accurate depth control. Single-point depth control is standard on folding 637 Disks, allowing you to easily and precisely set depth from one point at the front of the disk. Mechanical stops are standard on rigid models.