Description
When your disc mower starts leaving ragged stubble or those uncut strips that make you cringe, it’s usually telling you the blades need attention. Dull or damaged knives don’t just cut poorly—they make your tractor work harder and can leave stems crushed instead of cleanly sliced, which affects how your hay cures. These KONDEX left-hand drum knives with their 11-degree twist are built to restore that clean cutting action your Krone or Fella mower had when it was new.
What You’re Getting
- Sharp cutting edge with an 11-degree twist that slices through crop stems cleanly rather than tearing them
- Counter-clockwise rotation design engineered specifically for left-hand disc positions
- Durable construction at 4.4 inches long and 1.9 inches wide to handle the demands of daily field work
- Six-pack quantity gives you enough spares to replace multiple worn knives at once
- Direct bolt-on replacement with 0.750-inch (19mm) bolt holes that match your original equipment
Built for Real Farm Work
These knives are designed to fit Krone disc mowers using part number 139.888.0 and Fella mowers needing 123.706. Whether you’re cutting alfalfa, grass hay, or mixed stands, these mowers see plenty of use during hay season. The left-hand rotation works with the right-hand knives to create that overlapping cut pattern that leaves clean, even stubble.
Made to Last
KONDEX builds these knives with 4.0mm thickness and quality steel that holds its edge through rocks, dirt, and the inevitable surprises hiding in your fields. The 11-degree twist isn’t just for looks—it creates a slicing action that stays sharp longer and cuts more efficiently than straight blades.
Good to Know
These are left-hand knives, so they’ll only work on the left-rotating discs. If you need the matching right-hand knives, look for part 798-RM8890. When you’re replacing disc knives, it’s smart to do both sides at the same time so you get even cutting performance. You’ll also want bolt kit RF137 if your hardware needs freshening up.


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