METHOD FOR REPLACING FUEL PREFILTER ELEMENT
WARNING
• Immediately
after the engine is stopped, the parts are still very hot. Do not replace the filter immedi-
ately.
Wait for all of parts to 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 prefilter element uses 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 fuel prefilter element other than a Komatsu genuine part is used, foreign material 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
• Cloth
1.
Set the machine in the posture shown in the figure.
1)
Start the engine.
2)
Set the lock lever to FREE position (F).
Be sure to operate the lock lever by the operating por-
tion on the top.
3)
Operate the work equipment control lever slowly to the
right and left to swing the upper structure so that the
fuel prefilter comes between the tracks.
4)
Operate the work equipment control levers, and lower
the work equipment to the ground.
MAINTENANCE MAINTENANCE PROCEDURE
4-71
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