system

5.7.1Checking the fuel system for leaks and damage

WARNING

When the diesel engine is running, the fuel lines are constantly under a fuel pressure of up to 2400 bar

Escaping liquids can penetrate the skin and will lead to injuries.

Only work on the fuel and injection system when the diesel engine is turned off. Reduce pressure to below 20 bar with diagnostics software. Check the residual pressure with diagnostics software.

Wear suitable protective equipment when working on the fuel and injection system.

Do not open any fuel connections that are under pressure.

Do not remove any fuel lines and hoses that are under pressure. Protect hands, face and body against escaping liquids when searching for leaks on lines and hoses that are under pressure.

Screw connections on the injection system tight with the prescribed tightening torques.

Check fuel tank and fastening, see documentation from the device manufacturer.

Check tank lid, see documentation from the device manufacturer.

Check fastening of fuel line to the fuel tank, see documentation from the device manufacturer. If components are damaged: Do not start engine

Replace defective components, see repair manual.

5.7.2Replacing thefuel prefilter

Note

The fuel prefilter with water separator is not attached directly to the diesel engine and is installed differently depending on the device design, see documentation from the device manufacturer.

Make sure that the following prerequisites are met: A collection container for escaping fuel is available.

NOTICE

Dirt!

Damage to Common Rail System.

Make sure that no dirt comes in contact with fuel-carrying parts.

Do not reuse fuel filter and fuel fine filter.

Observe instructions for work on the Common Rail System.

For procedure to replace the fuel prefilter, see documentation from the device manufacturer. Ventilate the fuel system. (For more information see: 5.7.5 Ventilating the fuel system, page 106.)

5.7.3Reducing the pressure in the fuel system

If the engine is running: Turn off the engine.

Check pressure reduction with diagnostics software (variables: 6996 - Fuel Pressure High 1/ 6997 - Fuel Pressure High 2). (For more information see: 7.1.3 Diagnostic tools, page 126.) Pressure below 10 bar

5.7.4Replacing thefuel fine filter

Removing the fuel finefilter

Make sure that the following prerequisites are met: A collection container is available.