Komatsu ecot3 Operation And Maintenance Manual page 321

MAINTENANCE PROCEDURE
9. When installing, apply oil to the packing surface and bring the packing surface into contact with the seal surface
of filter cartridge (4) and then tighten it further by 1/4 to 1/2 turns.
If the transparent cap is tightened too much, the O-ring will be damaged and this will cause leakage of fuel; if it
is not tightened enough, fuel will leak through the gap at the O-ring. To prevent these problems, always tighten
securely to the fixed tightening angle.
10. Clean the filter holder, fill the new filter cartridge with clean fuel, coat the packing surface thinly with oil, then
install to the filter holder.
(Machine of poor fuel arrangement specification)
Additional water separator (8) is installed.
Before replacing the fuel pre-filter cartridge, drain water and
sediment in the additional water separator (8).
NOTICE
When adding fuel, do not remove cap (B). Always add fuel from the 8
small holes (A) on the dirty side.
After adding fuel, remove cap (B) and install the fuel filter.
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.
11. 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.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
12. Check that the drain valve (2) is tightened securely.
13. Remove the vinyl bag covering connector (5), then connect connector (5).
REMARK
If water gets on the connector (5), the sensor may malfunction
and the water separator monitor may light up. When removing
connector (5), be extremely careful not to let water get on the
connector.
If water gets on connector (5), dry it completely before
connecting it.
14. Turn the valve (1) at the bottom of the fuel tank to the OPEN position (O).
15. After completing the replacement of filter cartridge (4), bleed the air.
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MAINTENANCE