Cub Cadet Yanmar 3TNV72 - Manual (Page 42)

GENERAL SERVICE INFORMATION
TNV IDI Service Manual 4-7
Function of Major Engine Components
Fuel Tank
The fuel tank is a reservoir that holds diesel fuel. When fuel leaves
the fuel tank it goes to the fuel filter / water separator. Next, fuel is
pumped to the fuel filter by the fuel pump. Next the fuel goes to the
fuel injection pump. Since fuel is used to keep the fuel injection
pump cool and lubricated, more fuel than necessary enters the
injection pump. When the injection pump pressure reaches a preset
value, a relief valve allows excess fuel to be returned back to the
fuel tank. The fuel tank is a required engine component.
Mechanical Fuel Pump
The mechanical fuel pump is a diaphragm type of pump and is
installed on the fuel injection pump body. The mechanical fuel
pump is standard equipment on some engine models and is driven
by a cam on the camshaft of the fuel injection pump. The
mechanical fuel pump is not installed on the fuel injection pump if
the electric fuel pump is installed.
Side and Top Filler Port (Engine
Oil) You can fill the crankcase with engine oil from either the side or
top filler port depending upon which one is most convenient.
Starter Motor
The starter motor is powered by the battery. When you turn the key
switch in the operator’s console to the START position, the starter
motor engages with the ring gear installed on the flywheel and
starts the flywheel in motion.
Component Function
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