178Service Manual – CS7010™
28 - Engine System - Petrol (Gasoline)
This chapter covers the things “on top” of the mechanical engine that make it run, such as the fuel system,
governor control and ignition system. It also includes routine engine maintenance information and
troubleshooting of engine starting or running problems. See the Kubota WG972 E3 Workshop Manual
9Y111-05710 for detailed information related to the complete mechanical engine.
Functional Description
Kubota WG972-GL-E3-NFK-1 Petrol (Gasoline)
The Kubota WG972 is a three cylinder, liquid cooled, naturally aspirated engine. The fuel system does not
utilize a control module. It is mechanically controlled. The ignition system is “self-contained”. That is, it has
no interaction with the fuel system and shares no components with it.
The fuel system begins with a petrol (gasoline) fuel tank which is horizontally mounted on the right side of
the engine compartment. The tank swings out to provide easier access to the engine compartment. An
electric fuel pump is mounted to the top of the tank. The tank contains a fuel level sending unit. The
carburetor has an additional fuel shut off solenoid that must be energized for petrol to ow through the
carburetor to the engine.
The engine RPM is controlled with a Woodward L-Series governor/speed
actuator based on requests from the main machine controller. The main machine
controller sends signals to the Woodward L-Series governor/speed actuator to
request one of three engine speeds based on operator request or cleaning mode.
The actuator has a “built in” microprocessor which receives the requests and
in turn physically moves the carburetor/mixer throttle blade to achieve the
requested engine speed.
The cooling system consists of a standard radiator and belt driven fan. Note that
the fan pushes air away from the engine and out through the radiator.
Gasoline (Petrol) Fuel Tank
Kubota Engine
Carburetor
Petrol
shut off
solenoid
Woodward L Series Actuator
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