Method For Replacing Fuel Prefilter Cartridge - Komatsu H70051 Series Operation & Maintenance Manual

MAINTENANCE

METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE

• Immediately after the engine is stopped, the parts are still very hot. Do not replace the filter immedi-
ately. Wait for all 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 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 foreign
material 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 drained fuel
• Filter wrench
When replacing the fuel main filter cartridge (every 1000 hours), replace the fuel prefilter cartridge first.
1.
Open the engine side cover (1) on the right side of the ma-
chine.
2.
Place a container under the fuel prefilter cartridge to re-
ceive the fuel.
3.
Loosen the drain valve (2) and drain the water and sedi-
ments from transparent cup (3), and also drain all the fuel
from filter cartridge (4).
4.
Disconnect the connector (5).
5.
Wrap the connector (5) with a plastic bag, etc. so that fuel,
oil and water do not get onto the disconnected connector.
6.
Remove the clip (6) of sensor harness.
7.
Turn the transparent cup (3) counterclockwise by using the
filter wrench, and remove it.
Transparent cup (3) is used again.
8.
Turn the filter cartridge (4) counterclockwise by using the filter wrench, and remove it.
9.
Install the currently removed transparent cup (3) to the bottom of the new fuel prefilter cartridge.
At this time, be sure to replace the O-ring (7) with a new one.
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WARNING
MAINTENANCE PROCEDURE
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