MAINTENANCE SERVICE PROCEDURE
4-49
EVERY 500 HOURS SERVICE
Maintenance for every 50 and 250 hours service should be carried out at the same time.
REPLACE FUEL FILTER CARTRIDGE
WARNING
● Engine is at high temperature immediately after the machine has been operated. Wait for engine to
cool down before replacing the filter.
● 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 car-
tridge.
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, tighten until the packing surface contacts
the seal surface of the filter holder, then tighten it up 1/2
to 3/4 of a turn.
If the filter cartridge is tightened too far, the packing will
be damaged and this will lead to leakage of fuel. If the fil-
ter cartridge is too loose, fuel will also leak from the pack-
ing, so always tighten to the correct amount.
5. Loosen the knob of feed pump(2) and operate it 50 to 60 times up and down. This will bleed the air.
6. Push in the knob of feed pump(2) and tighten it.
7. After replacing the filter cartridge, start the engine and check that there is no leakage of fuel from the filter
seal surface. If there is any leakage of fuel, check the tightening of the filter cartridge. Whenever there is
leakage of fuel, follow Steps 1 and 2 to remove the filter cartridge, then check the packing surface for dam-
age or foreign material.
If any damage or foreign material is found in the packing, replace the packing with a new part, then repeat
Steps 3 - 6 to install the filter cartridge.
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