Doosan D55C-9 - Fuel Filter (with Pre;Main Filter) - Change

Maintenance Section
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Fuel Filter (with Pre/Main Filter) –
Change
The fuel filter element must be replaced on a regular
basis to prevent foreign materials from entering the diesel
fuel system.
Stop and cool down the engine.
Disconnect wire harness connector (1) and disconnect
the fuel hose (2) connected to the fuel pre filter port.
When removing the fuel filter, hold it carefully to prevent
fuel from flowing out. Wipe and clean spilled fuel.
Install a new fuel filter and assemble the fuel filter ap.
Connect the wire harness connector and fuel hose
connector. When connecting the fuel hose, take care to
prevent foreign material from entering the hose.
Disconnect wire harness connector (3) and disconnect
the fuel hose (4) connected to the fuel main filter port.
When removing the fuel filter, hold it carefully to prevent
fuel from flowing out. Wipe and clean spilled fuel.
Install a new fuel filter and assemble the fuel filter cap.
Connect the wire harness connector and fuel hose
connector. When connecting the fuel hose, take care to
prevent foreign material from entering the hose.
After replacing the fuel filter or element, or having
exhausted fuel, it is necessary to remove the air in the
fuel system for safe engine start up.
Loosen the plug of air bleed port (5).
Press the pump (6) with your hand until the oil comes out.
In this operation, all the fuel hose (2) and (4) must be
connected.
Retighten the plug of air bleed port (5).
Check the fuel leakage.