Komatsu D61EX-24 Operation & Maintenance Manual page 372

MAINTENANCE
7.
Thinly apply oil to the packing surface of the new filter car-
tridge, then install the filter cartridge to the filter head.
Replace inner seal (3) with a new one.
8.
After the packing surface reaches the sealing surface of
the filter head, tighten the filter cartridge 3/4 turns.
REMARK
If the filter cartridge is fastened too much, the packing will
be damaged and this leads to leakage of fuel. If the filter
cartridge is too loose, fuel will also leak from the packing.
Be sure to observe the tightening angle.
9.
Turn fuel supply valve (1) to OPEN position (O).
10. Bleed air.
1)
Fill up the fuel tank with fuel (to the level where the
float is at the highest position).
2)
Loosen the knob of feed pump (4), pull it out, then
pump it in and out until the movement becomes
heavy.
REMARK
• It is not necessary to remove the plugs at the fuel
prefilter head and at the fuel main filter head.
• When the engine runs out of fuel, use the same
procedure to operate feed pump (4) and bleed the
air.
3)
After bleeding air, push in the knob of feed pump (4)
and tighten it.
11. Turn the starting switch key to START position (C) and
start the engine.
12. 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 condi-
tion of the filter cartridge.
If the fuel still leaks, remove the filter cartridge again, and
check the packing surface for damage or foreign material.
If the packing surface is damaged or there is any foreign
material on it, replace the filter cartridge with a new one,
install the filter cartridge according to the preceding procedure, and then bleed air from the fuel circuit.
13. Run the engine at low idle for approximately 10 minutes.
MAINTENANCE PROCEDURE
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