When to Change Disk Blades

Generally, a blade begins to lose its effectiveness for leveling and penetration when it has worn down past 15 to 20% of its original size. For example, the following blade sizes would be worn down to that point using the 15 to 20% rule of thumb.

Blades wear differently depending on conditions and proper operation and these guidelines have nothing to do with John Deere warranty policy on these blades.

Original Diameter	Replace Blade When Diameter Is
660 mm (26 in)	512—533 mm (20-1/2—21 in)
609 mm (24 in)	495—508 mm (19-1/2—20 in)
559 mm (22 in)	470—482 mm (18-1/2—19 in)