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Service Manual – CS7000
Engine System - LPG
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
One of the engines available in the CS7000 is a LPG Kubota (WG972-GL-E3-NFK-1). It 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 33 pound propane 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. There is
an in-line pressure relief valve and a pressure switch between the tank and the fuel pressure vaporizer/
regulator. The fuel pressure vaporizer/regulator takes in high-pressure propane liquid, changes it to a vapor
and reduces it to a constant low pressure gas for the engine to draw in and burn. The change from liquid to
gas absorbs a lot of heat and acts as an air conditioner. To prevent frosting up the regulator, it is heated
with engine coolant. The vaporizer/regulator supplies gaseous fuel to the carburetor through a hose. The
carburetor has an additional fuel shut off solenoid that must be energized for fuel to flow 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.
Propane Fuel Tank
Fuel Vaporizer/
Regulator
Kubota LPG Engine
Carburetor
Fuel
shut off
solenoid
Woodward L Series Actuator
Содержание CS7000 Fuel Cell EcoFlex
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Страница 172: ...Engine System LPG 172 Service Manual CS7000 Low LP Pressure Switch Fuel Tank Pressure relief valve Fuel Tank Area ...
Страница 357: ...Steering System 357 Service Manual CS7000 Steering System Wiring Diagram 36 V From Key Switch ...