17-1
17. TROUBLESHOOTING
Sc2450 Operator's Manual
17. TROUBLESHOOTING
The troubleshooting table given below is intended to provide a simple guide for the operator or owner. If
any fault, failure or a problem that requires repair work has occurred, contact your local Cub Cadet
Yanmar dealer for technical assistance.
1. Engine
1. Guide in Using the Troubleshooting Table
Symptom Cause Remedy
1 Engine does not
start or engine
starts, but stalls
immediately.
z Diesel fuel is not flowing or is not
flowing sufficiently to the engine.
• Check that there is sufficient fuel in the
fuel tank. Refuel as necessary.
• Check that the fuel filter is not clogged.
Replace the clogged filter.
z Air is trapped in the fuel system. • Check the fuel line for looseness.
Retighten any loose connections.
• Bleed air from the fuel system.
z Water contamination in the fuel
system.
• Remove water from the fuel tank, fuel lines
and fuel filter (replace filter as necessary).
Refill the fuel tank with diesel fuel.
z In cold weather, the engine oil viscosity
is excessively high, which causes
greater resistance. As a result, the
engine speed is lower than normal.
• Use a less viscous engine oil; Be sure to
change to a more viscous engine oil in
summer. (Consult your local Cub Cadet
Yanmar dealer for details.)
z The power of the battery is too low and
the starter fails to accelerate to a
speed sufficient to start the engine.
• Clean the battery posts and terminals,
then measure the voltage of the battery. If
the voltage is 11 V or lower, replace the
battery with a new one.
• During cold weather, it is recommended to
remove the engine from the tractor and
store it indoors. Recharge the battery (as
necessary) before installing it in the
tractor.
2 Engine starts, but
fails to run
smoothly or is not
powerful.
z Stale diesel fuel (owing to prolonged
storage).
• Replace the diesel fuel.
z Contaminated diesel fuel. • Replace the diesel fuel. Replace fuel filter
(as necessary).
z Clogged air cleaner. • Replace the air cleaner.
z The fuel shut-off valve is not in the fully
OPEN position.
• Fully open the fuel shut-off valve.
3 Engine starts
successfully, but
stops suddenly.
z No diesel fuel. • Refuel.
z The fuel shut-off valve is not in the
OPEN position.
• Open the fuel shut-off valve.
4 Blackish exhaust. z Poor diesel fuel quality. • Replace the diesel fuel and fuel filter.
z Too much engine oil. • Drain the engine oil to the specified level.
z Clogged air filter. • Clean or replace the air filter.
5 Pale bluish
exhaust.
z Faulty or defective injection nozzle. • Contact your local Cub Cadet Yanmar
dealer for technical assistance.
z Poor diesel fuel quality. • Replace the diesel fuel and fuel filter.
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