Dixon 44/968999538, 44/968999547, 44/968999611, 42/968999689, 42/968999713, 36/968999539, 36/968999609 Operator's Manual page 54

Problem
Uneven mowing results.
The machine vibrates.
54-
DIXON
TROUBLE SHOOTING
Cause
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Different air pressure in tires on left and right
sides.
Bent blades.
Suspension for the mower deck is uneven.
Chain fixture has come loose.
Blades are dull.
Driving speed too high.
Grass is too long.
Grass collected under the mower deck.
The blades are loose.
The blades are incorrectly balanced.
The engine is loose.