Husqvarna Z454 Owner Manual - Page 31

TROUBLESHOOTING Problem / Cause Engine will not start Blade switch is engaged Steering controls are not locked in the neutral / parking brake position Dead battery Contamination in the carburetor or fuel line Fuel supply shutoff valve is closed or in the wrong position Clogged fuel filter or fuel line Ignition system faulty Starter does not turn the engine over Dead battery Battery terminal cable contacts are defective Blown fuse Fault in the starter safety circuit. See Safety System in the Maintenance Section Engine runs rough Faulty carburetor Clogged fuel filter or jet Choke is activated with a warm engine 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 Engine overheats Clogged air intake or cooling fins Engine overloaded Poor ventilation around engine Defective engine speed regulator Too little or no oil in the engine Contamination in the fuel line Fouled spark plugs Battery not charging Battery terminal cable contacts are defective Charging lead is disconnected Fault in engine charging system Mower moves slowly, unevenly, or not at all Bypass lever(s) engaged Transmission drive belt is slack or off Air trapped in hydraulic system Mower deck not engaging Drive belt for the mower deck is loose Electromagnetic coupling contact is loose Blade switch is faulty or loose from cable contact Blown fuse Transmission leaks oil Damaged seals, housing, or gaskets Air trapped in hydraulic system Uneven mowing results Unequal air pressures in tires Bent blades Suspension for the mower deck is uneven Blades are dull Driving speed too high Grass is too long Grass has collected under the mower deck 31