HTC LZ30 / 968999776 User Manual

Husqvarna 

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57

TROUBLESHOOTING GUIDE

The engine seems weak.

•  Clogged air filter.
•  Fouled spark plugs.
•  Carburetor incorrectly adjusted.

The engine overheats.

•  Clogged air intake or cooling fins.
•  Engine overloaded.
•  Poor ventilation around engine.
•  Defective engine speed regulator.
•  Soot in the combustion chamber.
•  Too little or no oil in the engine.
•  Fouled spark plug.
•  Pre-ignition incorrect.

Battery not charging.

•  Poor contact with battery terminal cable 

connectors.

The machine moves slowly, unevenly, or not at all.

•  Parking brake on.
•  Bypass valve on pump open.
•  Drive belt for the transmission gears slack or has 

come off.

•  Defective hydraulic system.
•  Air in hydraulic system.

Mower deck not engaging.

•  Drive belt for the mower deck has come loose.
•  Contact for the electromagnetic coupling has 

loosened.

•  The blade switch is faulty or has come loose, from 

the cable contact.

•  The fuse has blown.

Transaxle leaks oil.

•  Damaged seals, housing, or gaskets.
•  Air trapped in hydraulic system.

Uneven mowing results.

•  Different air pressure in the tires on the left and 

right sides.

•  Bent blades.
•  The suspension for the mower deck is uneven.
•  The blades are dull.
•  Driving speed too high.
•  The grass is too long.
•  Grass collected under the mower deck.

The machine vibrates.

•  The blades are loose.
•  The blades are incorrectly balanced.
•  The engine is loose.