METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE
WARNING
• After the engine stops, all parts are still very hot, so do not replace the filter immediately. Wait for all
parts to cool down before starting the work.
• While the engine is running, high-pressure is generated in the engine fuel piping.
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 open flame close.
NOTICE
• Komatsu genuine fuel filter cartridges use a special filter that has highly efficient filtering ability.
When replacing the parts, Komatsu recommends using Komatsu genuine parts.
• The common rail fuel injection system used on this machine consists of more precise parts than
those in the conventional injection pump and nozzles. If any cartridge other than a Komatsu genu-
ine filter cartridge is used, dust or dirt may get in and cause problems with the injection system.
Never use a substitute.
• When performing inspection and maintenance of the fuel system, be careful not to let any dirt or
dust get in, more than ever before. If dust sticks to the fuel system, wash it off thoroughly with fuel.
Items to be prepared
• Container to catch the fuel
• Filter wrench
When replacing the fuel main filter cartridge (every 1000 hours), replace the fuel prefilter cartridge first.
1.
Close the fuel supply valve (1) of the fuel tank.
2.
Loosen the bolts (2) (2 pieces) and open the cover (3).
MAINTENANCE PROCEDURE MAINTENANCE
4-46
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