Troubleshooting - Craftsman Z7400 Operator's Manual

Problem / Cause
Engine will not start
Blade switch is engaged
Steering controls are not locked in the neutral position
Park brake is not activated
Battery is dead
Contamination in the carburetor or fuel line
Fuel supply shutoff valve is closed
Clogged fuel filter or fuel line
Ignition system faulty
Starter does not turn the engine over
Dead battery
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
Clogged fuel filter or jet
Choke open on 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
Poor contact of the battery terminal cable connections
Charging lead is disconnected
Fault in engine charging system
Machine moves slowly, unevenly, or not at all
Park brake on
Bypass linkage engaged
Drive belt for the transmission slack or has come off
Air trapped in hydraulic system
Mower deck not engaging
Drive belt for the mower deck has come loose
Contact for the electromagnetic coupling has loosened
Blade switch is faulty or has come loose from cable
contact
Blown fuse
Transaxle leaks oil
Damaged seals, housing, or gaskets
Air trapped in hydraulic system
Uneven mowing results
Different air pressure in tires on the left and right sides,
Bent blades
Suspending for the mower deck is uneven
Blades are dull
Driving speed too high
Grass is too long
Grass collected under the mower deck