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MAINTENANCE
SERVICE PROCEDURE
REPLACE FUEL MAIN FILTER CARTRIDGE
Carry out this operation after carrying out the maintenance in the "REPLACE PRE-FUEL FILTER CARTRIDGE
(PAGE 4-53)" for every 500 hours.
WARNING
After the engine has been operated, all parts are at high temperature, so do not replace the filter immediately. Wait for all parts
to cool down before starting the operation.
High pressure is generated inside the engine fuel piping system when the engine is running.
When replacing the filter, wait for at least 30 seconds after stopping the engine to let the internal pressure go down before
replacing the filter.
Do not bring any fire or flame close.
Be careful when opening the air bleed plug in the fuel filter head. It is still under pressure, so fuel may spurt out.
NOTICE
Genuine Komatsu fuel filter cartridges use a special filter that has highly efficient filtering ability. When replacing the filter
cartridge, always use a genuine Komatsu part.
The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection
pump and nozzle.
If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection
system. Always avoid using substitute parts.
When carrying out inspection or maintenance of the fuel system, pay more attention than normal to the entry of dirt. If dirt is
stuck to any part, use fuel to wash it off completely.
Prepare a filter wrench and a container to catch the fuel.
1.
Set the container under the filter cartridge to catch the drained oil.
2. Close the fuel valve (1).
3.
Using a filter wrench, turn filter cartridge (2) counterclockwise
to remove it.
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