Komatsu D155AX-8E0, Operation & Maintenance Manual

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METHOD FOR BLEEDING AIR FROM FUEL CIRCUIT
This machine is equipped with the fuel feed pump to bleed air from the fuel circuit.
In the following cases, bleed air according to the following procedure.
• When the fuel filter is replaced.
• When fuel is used up.
• When starting the engine for the first time after the fuel piping or supply pump is replaced or repaired.
METHOD FOR BLEEDING AIR
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WARNING
When using the fuel feed pump, do not loosen the air bleeding plug of the fuel circuit. The fuel circuit is
pressurized while the fuel feed pump is operated. If the air bleeding plug is loosened at this time, fuel
may spout out and it is dangerous.
1.
Turn the starting switch to OFF position (A).
2.
Check that supply valve (1) of the fuel tank is opened.
(S): CLOSE
(O): OPEN
3.
Tilt switch for the fuel feed pump (2) to ON position.
Lamp (3) flashes and the electric fuel feed pump operates.
After the specified time (approximately 7 minutes), lamp
(3) goes out automatically and the fuel feed pump stops.
When lamp (3) goes out, air bleeding is completed.
4.
If the fuel circuit is empty after the machine stops because
of running out of fuel, or the fuel hose and tubes are serv-
iced, or the supply pump is replaced, perform the following
procedure.
1) After the fuel feed pump stops automatically (the lamp
goes out), turn fuel feed pump switch (2) to ON position again.
2) Check that lamp (3) has gone out.
5.
Start the engine.
6.
After the engine starts, run it for approximately 5 minutes to bleed all air from the fuel circuit.
If the engine does not start, all air may not be bled. Repeat the operations of steps 1 to 6 again.
MAINTENANCE PROCEDURE MAINTENANCE
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