METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE
WARNING
• Just 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.
Prepare a filter wrench and a container to catch the oil.
1.
Open the inspection cover at the bottom of the fuel tank.
2.
Turn fuel supply valve (1) at the bottom of the fuel tank to
CLOSE position (C).
3.
Open the battery inspection cover at the rear left of the
machine.
4.
Place the oil container under filter cartridge (2).
5.
Remove connector (3) of the water separator sensor and
remove the sensor harness from clip (4).
After removing the connector, cover it with a vinyl bag to
prevent water from getting on it.
6.
Remove hose (5).
7.
Turn transparent cup (6) counterclockwise by using the fil-
ter wrench and remove it.
This cap is used again. If the cap is damaged, replace it
with a new one.
8.
Turn filter cartridge (2) counterclockwise by using the filter
wrench, and remove it.
9.
Install currently removed transparent cup (6) to the bottom
of the new filter cartridge.
At this time, be sure replace O-ring (7) with a new one.
When the O-ring has been replaced, coat the surface with
clean fuel before installing it.
10.
After the packing surface touches the seal surface of the
filter cartridge, tighten transparent cup (6) 1/4 to 1/2 turn.
MAINTENANCE PROCEDURE MAINTENANCE
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