Remove inspection cover (3) of the undercover at the rear of
the machine bottom according to the following procedure.
1.
Remove bolts (1) (2 pieces) on the front side of the machine.
2.
While holding down the cover, gradually remove bolts (2) (2 pieces) on the rear side of the machine.
3.
Lower the cover gradually, and remove it.
4.
Supply grease to the grease fittings shown by arrows (2
places).
METHOD FOR REPLACING FUEL MAIN FILTER CARTRIDGE
Perform this after performing “METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE (4-53)” in EVERY
500 HOURS MAINTENANCE.
WARNING
• After the engine stops, all parts are still very hot, so do not replace the filter immediately. Wait until
all of parts cool down before starting the work.
• 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 open flame close.
NOTICE
• Komatsu genuine fuel filter cartridges use a special filter that has highly efficient filtering ability.
When replacing 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 the inspection or maintenance of the fuel system, pay more attention than normal
to the entry of dirt. If dirt sticks to any part, use fuel to wash it off completely.
• After removing the fuel filter cartridge, fuel drops fall down from the filter head. In order to prevent
dropping of the fuel, be sure not to leave the machine the fuel filter cartridge removed.
Prepare a container to receive drained fuel.
Prepare a filter wrench
MAINTENANCE PROCEDURE MAINTENANCE
4-60
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