Cub Cadet 640 - Manual (Page 19)

19
SECTION 8: TROUBLESHOOTING
Trouble Possible Cause(s)
Engine will not start Battery has low voltage.
Loose or corroded battery connections.
Fusible link is melted.
Spark plug wire is loose or discon-
nected.
Faulty spark plug or coil.
Fuel shut-off valve turned off.
No Fuel or improper fuel.
Plugged fuel filter.
Defective starter solenoid.
Open-circuit in wiring.
Engine is hard to
start Engine is cold.
Plugged fuel filter.
Carburetor not adjusted properly or
dirty.
Engine oil viscosity too heavy.
Spark plug is fouled.
Faulty spark plug or wire.
Loose or corroded electrical connec-
tions.
Stale or improper fuel.
Choke not being used or adjusted incor-
rectly.
Engine misses under
load Faulty spark plug.
Stale or dirty fuel.
Plugged fuel filter.
Faulty coil or wire.
Engine vapor locks Poor quality fuel or methanol.
Very hot weather conditions.
Fuel tank vent plugged.
Dirt in fuel filter.
Engine runs
unevenly Loose electrical connections.
Choke or throttle cable sticking.
Fuel line or fuel filter plugged.
Stale or dirty fuel.
Improper fuel.
Air cleaner element plugged.
Carburetor not adjusted correctly.
Spark plug is fouled.
Engine overheats Air cleaner element missing or plugged.
Carburetor air intake tube plugged.
Engine oil low.
Engine operated too long at slow
engine speed.
Engine loses power Engine overheating.
Too much oil in engine.
Faulty spark plug.
Fuel supply being restricted.
Fuel filter plugged.
Fuel line pinched or kinked.
Fuel pump output not adjusted to speci-
fication.
Improper fuel.
Air cleaner element plugged.
Engine knocks Low engine speed.
Stale or low octane fuel.
Engine overloaded.
Drive chain jumps
change tooth;
repeated popping
noise. Insufficient Chain Tension (Too Loose)
Remove 1/2 link; if still loose, check for
suspension damage.
Contact authorized service dealer.
Starter does not work Loose or corroded connections.
Low battery output.
Sulfated or worn out battery.
Faulty starter.
Starter cranks slowly Low battery output.
Sulfated or worn out battery.
Engine oil too heavy.
Loose or corroded connections.
Entire electrical sys-
tem does not work Blown fuse.
Loose or corroded connections.
Sulfated or worn-out battery.
Dead battery Shorted starter solenoid.
Key switch not turned to STOP position.
Sulfated or worn out battery.
Battery light comes
on when engine is
running Low engine speed.
Faulty voltage regulator.
Faulty battery.
Faulty alternator.
Grounded wire in circuit.
Indicator lights do not
come on when key
switch is in START
position Fault bulb.
Faulty wiring.
Faulty sensor.
Battery will not take a
charge Dead battery.
Loose or corroded connections.
Sulfated or worn out battery.
Fluid level low.
Trouble Possible Cause(s)
NOTE: For repairs beyond minor adjustments or corrections, contact your nearest Cub Cadet service dealer or call
1-877-282-8684.