Komatsu PC138US-11 Operation & Maintenance Manual page 377

MAINTENANCE
2.
Turn the valve (1) to CLOSE position (S).
3.
Place the container to receive the oil under filter cartridge
(2).
4.
Turn the filter cartridge (2) counterclockwise by using the
filter wrench, and remove it.
5.
Clean the filter head.
6.
Thinly apply oil to the packing surface of the new filter cartridge, then install the filter cartridge to the filter
head.
NOTICE
• Do not fill the new filter cartridge with fuel.
• Remove the cap (B) at center and install the filter
cartridge.
When installing the cartridge, tighten it until the packing
surface contacts the seal surface of the filter holder, then
tighten it 2/3 or more turns.
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 tightened too loose, fuel will also leak from the
packing, so always tighten to the specified angle.
7.
Turn the valve (1) to OPEN position (O).
8.
After completing the replacement of filter cartridge (2), bleed air according to the following procedure.
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 (3), 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 pre-
filter head and at the fuel main filter head.
• When the engine runs out of fuel, use the same proce-
dure to operate feed pump (3) and bleed the air.
9.
After bleeding air, push in the knob of feed pump (3) and
tighten it.
10. After replacing the filter cartridge (2), start and run the engine at low idle for 10 minutes.
11. Check for leakage of oil from the filter seal surface and transparent cup mounting face.
If the leakage is noticed, check the filter cartridge for its tightening condition.
WENAM00111
MAINTENANCE PROCEDURE
4-61