Husqvarna EZ4220 Operator's Manual page 63

Uneven mowing results.
The machine vibrates.
64
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English
TROUBLE SHOOTING GUIDE
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Different air pressure in the tires on the left and
right sides.
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Bent blades.
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The suspending for the mower deck is uneven.
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The chain fixture has come loose.
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The blades are blunt.
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Driving speed too high.
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The grass is too long.
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Grass collected under the mower deck.
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The blades are loose.
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The blades are incorrectly balanced.
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The engine is loose.