TROUBLE SHOOTING

Problem

Cause

Engine will not start

Blade switch is engaged.

 

• Steering controls are not locked in the neutral position

 

• Parking brake is not activated

 

Battery is dead

 

• Contamination in the carburetor or fuel line.

 

• Fuel supply is closed or the shutoff valve for the fuel tank is in

 

 

the wrong position

 

• Clogged fuel filter or fuel line

 

Ignition system faulty

 

 

 

Starter does not turn the engine over

Battery is dead

 

• Poor contact of the battery terminal cable connections

 

Blown fuse

 

• Fault in the starter safety circuit. See Safety System in the

 

 

Maintenance section

 

 

 

Engine runs rough

Faulty carburetor

 

• Choke control is pulled out with a warm engine

 

• Clogged fuel filter or jet

 

• Clogged ventilation valve on the fuel cap

 

• Fuel tank nearly empty

 

Fouled spark plugs

 

• Rich fuel mixture or fuel-air mixture.

 

Wrong fuel type

 

Water in fuel

 

Clogged air filter

 

 

 

Engine seems weak

Clogged air filter

 

Fouled spark plugs

 

Carburetor incorrectly adjusted

 

• Air trapped in hydraulic system

 

 

 

Machine vibrates

Blades are loose

 

• Blades are incorrectly balanced

 

Engine is loose

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McCulloch 966564101, ZM4619 manual Trouble Shooting, Problem Cause, Maintenance section