Komatsu PC1250-11 Original Instructions Manual page 374

MAINTENANCE PROCEDURE
1.
Turn the valve (1) at the bottom of the fuel tank to
"CLOSE" position (S).
2.
Open the door on the walk-through, and in front of the en-
gine.
3.
Place a container under the fuel prefilter cartridge (2) to
catch the fuel.
4.
Turn the filter cartridge (2) counterclockwise by using the
filter wrench, and remove it.
After removing the filter cartridge, fuel drops from the filter
head.
In order to prevent the fuel from flowing out, be sure not to
leave the machine without the filter cartridge.
5.
Clean the filter head. Thinly apply oil to the packing of the new filter cartridge and install the 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.
6.
When installing the cartridge, tighten it until the packing
surface contacts the sealing surface of the filter head, then
tighten it 3/4 of a turn.
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.
When tightening by using a filter wrench, be extremely careful not to dent or damage the filter.
7.
Turn the valve (1) at the bottom of the fuel tank to "OPEN" position (O).
8.
After completing the replacement of filter cartridge (2), bleed air from the circuit.
For air bleeding, see "PROCEDURES FOR BLEEDING AIR FROM FUEL CIRCUIT".
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MAINTENANCE