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TROUBLE SHOOTING GUIDE
Trouble Shooting Guide
Problem Cause
The engine will not start. • 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.
• 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.
The starter does not turn the engine over. • Dead battery.
• Poor contacts on the battery terminal
cable connections.
• Fuse blown.
• Ignition system faulty.
• Fault in the starter safety circuit.
See “Checking the Safety System” in the
“Maintenance” section.
The engine runs rough. • Faulty carburetor.
• The choke control is pulled out with a warm engine.
• Defective valves.
• Defective piston, cylinder, piston ring, or
cylinder head seal.
• The cylinder head bolts are loose.
• Clogged fuel filter or jet.
• Clogged ventilation valve on the fuel cap.
• Fuel tank nearly empty.
• Defective spark plugs.
• The spark plugs are loose.
• Defective ignition cable.
• Defective spark plug electrode.
• Defective spark plug connection.
• Rich fuel mixture or fuel-air mixture.
• Wrong fuel type.