Replace knives. (See REPLACING KNIVES in section).

Broken knives.

Replace knives. (See REPLACING KNIVES in section).

Knives have unequal weight.

Replace knives in sets of three (around the rotor). (See REPLACING KNIVES in section).

Damaged rotor.

Repair or replace rotor as needed. (See your John Deere dealer).

Damaged rotor bearing.

Replace bearing. (See your John Deere dealer).

Adjust belt tension. (See ADJUSTING DRIVE BELT in Service section).

Misaligned pulleys.

Align pulleys. (See PULLEY ALIGNMENT in Service section).

Crop residue in pulleys area.

Clean side shield.

Add oil to recommended level. (See ADDING OIL TO GEAR CASE in Lubrication and Maintenance section).

Bearing failure.

Replace bearing. (See your John Deere dealer).

Gear failure in gear case.

Inspect gear case components and replace as needed. (See your John Deere dealer).

Replace belt. (See BELT INSTALLATION in section).

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