Komatsu WA600-8 Operation & Maintenance Manual page 421

MAINTENANCE
2.
Place a container under the fuel prefilter cartridge (2) to
catch the fuel.
3.
Loosen drain valve (3) and drain water and sediments
from transparent cup (4), and also drain all the fuel from fil-
ter cartridge (2).
4.
Remove the drain hose (5).
The drain hose and clip are to be reused.
5.
Turn the filter cartridge (2) counterclockwise by using the
filter wrench, and remove it.
Filter cartridge (2) and transparent cup (4) are integrated.
6.
Make sure that drain valve (3), which is provided in the lower part of transparent cup (4) of the new filter
cartridge, is firmly tightened.
Tightening torque: 2.5 to 3.4 Nm {0.25 to 0.35 kgm}
7.
Clean the filter head.
8.
Fill the new filter cartridge with clean fuel.
NOTICE
• When filling the filter cartridge with fuel, do not re-
move cap (A) at the center. Always fill with fuel
from small holes (B) (8 places) on the dirty side.
• After filling with fuel, remove cap (A) 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 (A)
when filling with fuel. Be careful not to let dirt or
dust get into the center portion on the clean side.
9.
Thinly apply oil to the packing surfaces.
10. Remove filter cartridge cap (A) and install it to the filter
head.
When installing the cartridge, tighten it by hand until the
packing surface contacts the seal surface of the filter head.
If the filter cartridge is tightened too much, the packing
may be damaged and this will cause the leakage of fuel. If
it is not tightened enough, fuel will leak through the gap at
packing. Be sure to observe the tightening angle.
11. Tighten it 1/2 to 3/4 turns by using the filter wrench.
Take care not to damage or deform the filter cartridge.
12. Install the drain hose (5).
13. Check that drain valve (3) is closed securely.
14. After replacing the filter cartridge, start the engine and run it at low idle for 10 minutes.
15. Check the filter seal surface and the mounting face of the transparent cup for fuel leakage.
If there is any leakage of fuel, check the tightening condition of the filter cartridge.
If there is still fuel leakage, perform steps 1 to 5 to remove the filter cartridge, and if any damage or pinched
foreign material on the packing surface is found, replace it with a new cartridge and repeat steps 6 to 13.
16. Release the lock of engine side cover (1) and close it.
For the machine with rear fender, hold the edge and be sure to close the cover (b).
MAINTENANCE PROCEDURE
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