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2.
Clean area around special lock nut (A).
3.
Rotate disk so knife bolt is over hole (B).
Put a piece of wood between two disks to prevent them from turning while loosening knife bolt.
Remove knife bolt and nut with socket wrench. Remove knife. If knife bolt is tight, move wear shield toward center of disk using a hammer.
4.
Check knife, bolt, and nut before reinstalling. (See "Checking Knives", "Checking Knife Bolt Wear" and "Checking Knife Lock Nut Wear" in this section.)
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