Komatsu WA380-6 Operation & Maintenance Manual page 287

SERVICE PROCEDURE SERVICE PROCEDURE
5. Using a filter wrench, turn filter cartridge (2) counterclockwise
on remove it.
6. Take water separator cup (3) installed to the bottom of the
cartridge and turn it to the left to remove it. (This cup is used
again. If it is damaged, replace it with a new part.)
7. Install cup (3) to the bottom of the new fuel pre-filter cartridge.
When doing this, always replace the seal ring with a new part.
Tightening torque for cup: 10 Nm {1.0 kgm}
When replacing the seal ring, coat the surface with clean fuel
before installing it.
8. Check that drain plug (4) at the bottom of cup (3) of the fuel
pre-filter is tightened securely.
Tightening torque: 0.2 - 0.45 Nm {0.02 - 0.046 kgm}
9. Clean the filter holder.
NOTICE
When filling the filter cartridge with fuel, carry out the filling operation with
cap (A) fitted.
Cap (A) acts to prevent the entry of dirt or dust into the filter cartridge.
10. Fill the filter cartridge with clean fuel through the 8 small holes
(B) in the new filter cartridge.
11. Coat the packing surface of the filter cartridge with oil.
12. Remove filter cartridge cap (A) and install to the filter holder.
13. 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.
14. Connect connector (1).
15. When carrying out standard replacement of the fuel filter cartridge (EVERY 1000 HOURS), replace the cartlidge
and bleed the air. For details, see "REPLACE FUEL MAIN FILTER CARTRIDGE (PAGE 4-52)".
16. Start the engine, check that there is no leakage of fuel from the filter seal surface or water separator mounting
surface, then run for approx. 10 minutes at low idling.
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MAINTENANCE MAINTENANCE