Trouble Shooting Guide - Husqvarna EZ4220 Operator's Manual

Trouble Shooting Guide

Problem
The engine will not start.
The starter does not turn the engine over.
The engine runs rough.
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TROUBLE SHOOTING GUIDE
Cause
•
The blade switch is engaged.
•
The steering controls are not locked in the neutral
position.
•
The driver is not sitting in the driver's seat.
•
The parking brake is not activated.
•
The battery is dead.
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Contamination in the carburetor or fuel line.
•
The fuel supply is closed or the shut-off valve for
the fuel tank is in the wrong position.
•
Clogged fuel filter or fuel line.
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Dead battery.
•
Poor contacts on the battery terminal cable
connections.
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Fuse blown.
•
Ignition system faulty.
•
Fault in the starter safety circuit.
See Checking the Safety System in the
"Maintenance Section,"
•
Faulty carburetor.
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The choke control is pulled out with a warm engine.
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Defective valves.
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Defective piston, cylinder, piston ring, or
•
cylinder head seal.
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The cylinder head bolts are loose.
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Clogged fuel filter or jet.
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Clogged ventilation valve on the fuel cap.
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Fuel tank nearly empty.
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Defective spark plugs.
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The spark plugs are loose.
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Defective ignition cable.
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Defective spark plug electrode.
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Defective spark plug connection.
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Rich fuel mixture or fuel-air mixture.
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Wrong fuel type.
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Water in the fuel.
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Clogged air filter.
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Air trapped in hydraulic system.