Komatsu PC450-8, Operation & Maintenance Manual, Page: 323 / 474

MAINTENANCE
MAINTENANCE PROCEDURE
4-57
NOTICE
q
When adding fuel, do not remove cap (B). Always add
fuel from the 8 small holes (A) on the dirty side.
q
After adding fuel, remove cap (B) and install the fuel fil-
ter.
q
Always fill with clean fuel. Be careful not to let any dirt
or dust get into the fuel. In particular, center portion is
the clean side, so do not remove cap (B) when adding
fuel. Be careful not to let dirt or dust get into center
portion on the clean side.
12. 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.
q
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
13. Turn the valve (1) at the bottom of the fuel tank to the
OPEN position (O).
14. After replacing the filter cartridge, start the engine and run
it at low idling for 10 minutes.
Check for leakage of fuel from the filter seal surface and
transparent cap mounting. If any fuel is leaking, check the
tightening of the filter cartridge. If there is still fuel leakage,
repeat Steps 1 - 6 to remove the filter cartridge, and if any
damage or embedded foreign material in the packing sur-
face is found, replace it with a new cartridge and repeat
Steps 7 - 14 to install it.