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Vibration
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Missing knives.
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Replace knives. (See REPLACING KNIVES in Service section).
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Broken knives.
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Replace knives. (See REPLACING KNIVES in Service section).
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Knives have unequal weight.
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Replace knives in sets of three (around the rotor). (See REPLACING KNIVES in Service section).
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Damaged rotor.
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Repair or replace rotor as needed. (See your John Deere dealer).
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Damaged rotor bearing.
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Replace bearing. (See your John Deere dealer).
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Belt breakage
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Incorrect belt tension.
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Adjust belt tension. (See ADJUSTING DRIVE BELT in Service section).
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Misaligned pulleys.
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Align pulleys. (See PULLEY ALIGNMENT in Service section).
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Grass residue in pulleys area.
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Clean side shield.
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Excessive noise from mower
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Gearbox oil level too low.
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Add oil to recommended level. (See ADDING OIL TO GEAR CASE in Lubrication and Maintenance section).
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Bearing failure.
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Replace bearing. (See your John Deere dealer).
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Gear failure in gear case.
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Inspect gear case components and replace as needed. (See your John Deere dealer).
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Rotor does not turn
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Broken belt.
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Replace belt. (See BELT INSTALLATION in Service section).
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