MAINTENANCE MAINTENANCE PROCEDURE
4-55
EVERY 500 HOURS MAINTENANCE 4
Maintenance for every 100 and 250 hours should be carried out at the same time.
REPLACE FUEL FILTER CARTRIDGE 4
WARNING
q The parts are at high temperature immediately after the engine has been operated. Wait for all parts to
cool down before replacing the filter.
q Do not bring fire or sparks near the fuel.
Prepare a filter wrench and a container to catch the fuel.
1. Set the container to catch the fuel under the filter cartridge.
2. Using a filter wrench, turn filter cartridge (1) counterclock-
wise to remove it.
3. Clean the filter holder, fill a new filter cartridge with clean
fuel, coat the packing surface with engine oil, then install it
to the filter holder.
4. When installing, screw in cartridge until seal comes in con-
tact with sealing surface, then tighten approx. an additional
1/2 turn.
If the filter cartridge is tightened too far, the packing will be
damaged and this will lead to leakage of fuel. If the filter
cartridge is too loose, fuel will also leak from the packing,
so always tighten to the correct amount.
5. After replacing the fuel filter cartridge, bleed the air from the system.
Bleed the air as follows.
6. Fill the fuel tank with fuel (to the position where the float is at the highest position).
7. After replacing filter cartridge (1), loosen plug (2).
8. Loosen the knob of feed pump (3) and pump it up and down until no more bubbles come out with the fuel from
plug (2).
9. Tighten plug (2).
Always use a Komatsu genuine part for the filter cartridge.
After replacing the filter cartridge, start the engine, and check that there is no leakage of fuel from the filter seal
surface.
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