Komatsu WA800-3E0 Series Operation & Maintenance Manual page 287

MAINTENANCE
6. Remove filter cartridge cap (A) and install to the filter
holder.
NOTICE
Do not fill the filter cartridge with fuel.
Cap (A) is installed to prevent dirt from entering the inside
of the filter cartridge.
7. When installing, tighten until the packing surface contacts
the seal surface of the filter holder, then tighten it 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 filter
cartridge is too loose, fuel will also leak from the packing,
so always tighten the correct amount.
8. After replacing fuel filter cartridge (2), bleed the air. For details, see "PROCEDURE FOR BLEEDING AIR (3-
144)".
9. After bleeding the air, start the engine and check for any leakage of fuel from the filter seal surface. If there is
any leakage of fuel, check the tightening of the filter cartridge. If there is still leakage of fuel, repeat Steps 2
and 3 to remove the filter cartridge, then check the packing surface. If there is any damage or embedded
material in the packing surface, replace the cartridge with a new part, then repeat the procedure from Step 4 to
Step 9.
SERVICE PROCEDURE
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