LiuGong CLG835H, Service Manual

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January 24, 2017 Structure Function Principle
CLG835H Fuel System
Description of principle diagram and working principle
Fuel system acts to provide engine with clean and sufficient fuel, which thus ensures proper operation of
engine. Its working principle is shown above: when engine works, oil transfer pump sucks fuel from fuel
tank, then oil-water separator eliminates water from fuel, next fuel filter eliminates Impurities from fuel,
and finally fuel enters high pressure fuel pump. The fuel is pressurized by the high pressure fuel pump
and filled into high pressure common rail. Then, the fuel in the common rail enters into injector, while the
spare fuel returns back to the outlet of high pressure fuel pump. The injector is controlled by ECM. The
diesel fuel is injected into combustion chamber, while the spare fuel returns back to the outlet of high
pressure fuel pump and then back to fuel tank after cooled.
Fuel radiator
The fuel radiator is used for cooling the hot fuel that returns back from engine fuel pump to avoid the hot
fuel directly flowing back to the fuel tank and heating the fuel in it.
1. Fuel tank
2. Fuel filter
3. Oil transfer pump
4. High-pressure fuel pump
5. Oil-water separator
6. Fuel radiator
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