Komatsu ecot3 WA430-6 Operation & Maintenance Manual page 289

SERVICE PROCEDURE
7. 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.
8. After completing replacement of fuel filter cartridge (1), bleed the air from the system. For details, see
"PROCEDURE FOR BLEEDING AIR (PAGE 4-54)".
9. After completing the air bleeding, start the engine and check that there is no leakage of fuel from the filter seal
surface. If there is any leakage, check the tightening condition of the filter cartridge. If there is still fuel leakage,
repeat Steps 1 - 3 to remove the filter cartridge, then check the packing surface for damage or embedded dirt.
If any damage or embedded dirt is found, replace the cartridge with a new part and repeat Steps 4 - 8 to install
it.
PROCEDURE FOR BLEEDING AIR
1. Fill the fuel tank with fuel.
2. Insert the key in the starting switch and turn it to ON position
(B).
3. Hold the key at the ON position (B) for 30 seconds, then return
it to OFF position (A) and wait for 10 seconds.
4. Repeat the operations in Step 2 and Step 3 four times.
5. Crank the engine with the starting motor (starting rotation of starting motor) and start the engine.
When the engine is cranked, the air is automatically bled from the high-pressure circuit.
If the engine does not start, the air has probably not been bled properly from the low-pressure circuit. Repeat
the procedure from Step 1.
If the engine is operated with air remaining in the fuel circuit, an error (CA449, CA559) may be generated in
the fuel system.
If this happens, keep the throttle at Lo after starting the engine and run the engine continuously for approx.
3 minutes.
When the air is bled and the engine rotation becomes stabilized, the error display will go out.
4 - 54
MAINTENANCE