Komatsu PC308USLC-3E0 Operation & Maintenance Manual page 276

MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE
Replace inner seal (3) with a new part.
NOTICE
Do not fill the new filter cartridge with fuel.
Remove cap (B) and install the filter cartridge.
6. 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.
7. Turn the valve (1) at the bottom of the fuel tank to the OPEN position (O).
8. After completing the replacement of filter cartridge (2), bleed the air.
Bleed the air as follows:
9. Fill the fuel tank with fuel (to the position where the float is at the highest position).
10. Loosen the knob of feed pump (4), pull it out, then pump it in
and out until the movement becomes heavy.
REMARK
It is not necessary to remove the plug at the top of the fuel
pre-filter and fuel main filter.
After the engine runs out of fuel, use the same procedure to
operate feed pump (4) and bleed the air.
11. Push in the knob of feed pump (4) and tighten it.
12. After replacing the filter cartridge, start the engine and run it at low idling for 10 minutes.
Check for leakage of oil from the filter seal surface. If any oil is leaking, check the tightening of the filter cartridge.
If there is still oil leakage, repeat Steps 1 - 4 to remove the filter cartridge, and if any damage or embedded
foreign material in the packing surface is found, replace it with a new cartridge and repeat Steps 5 - 12 to install
it.
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MAINTENANCE MAINTENANCE