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MAINTENANCE PROCEDURE
METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE
•
Immediately after the engine is stopped, all parts are still very hot, so do not replace the filter imme-
diately. 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 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 fuel.
1.
Open the inspection cover under the fuel tank on the right
side of the machine.
2.
Turn fuel supply valve (1) to CLOSE position (C).
3.
Open the engine side cover on the left side of the ma-
chine.
4.
Take out drain hose (2) toward the front of the machine.
5.
Place a container to catch fuel under drain hose (2).
6.
Loosen drain valve (3) and drain water and sediments
from transparent cup (4), and also drain all the fuel from fil-
ter cartridge (5).
7.
Remove clamp (6) of the water separator harness, and re-
move connector (7).
Wrap the removed connector with a plastic bag to prevent
fuel, oil or water from being splashed on it.
8.
Turn transparent cup (4) counterclockwise to remove it by
using the filter wrench.
This cap is used again. If the cap is damaged, replace it
with a new one.
9.
Turn filter cartridge (5) counterclockwise by using the filter
wrench, and remove it.
10. Install currently removed transparent cup (4) to the bottom
of the new filter cartridge.
At this time, be sure to replace the O-ring with a new one.
4-52
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WARNING
MAINTENANCE
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