Komatsu PC490-11, Installation And Instruction Manual

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METHOD FOR CHECKING WATER SEPARATOR, DRAINING WATER AND SEDI-
MENT
1.
Open the engine hood.
The water separator forms one unit with fuel pre-filter (1).
2.
Check for water and sediment.
It is possible to judge the water level and amount of sedi-
ment by looking through transparent cup (2).
NOTICE
If the water inside transparent cup (2) freezes, check
that the frozen water has melted completely, then fol-
low the procedure to drain the water.
3.
Put a container to receive the water under drain hose (3).
4.
Loosen drain valve (4) and drain the water.
5.
When fuel starts to drain from drain hose (3), tighten drain valve (4) immediately.
Tightening: 2.5 to 3.4 Nm {0.25 to 0.35 kgm}
If drain valve (4) is hard to move, adjust it so that it moves smoothly. For details, see “Adjustment of drain
valve”.
METHOD FOR ADJUSTING DRAIN VALVE
1.
Turn valve (6) at the bottom of the fuel tank to CLOSE po-
sition (S).
2.
Place a container under the fuel prefilter cartridge to re-
ceive the fuel.
3.
Loosen drain valve (4) to drain water and sediments from
transparent cup (2), and also drain all the fuel from filter
cartridge (1).
4.
Check that nothing more comes out from drain hose (3),
then remove drain valve (4).
5.
Apply a suitable amount of grease to O-ring (7).
REMARK
When applying grease, be careful not to allow the grease
to adhere to water drain port (8) and threaded part (9) of
the drain valve.
6.
Tighten drain valve (4) by hand until it contacts the bottom
of transparent cup (2).
7.
Remove the fuel container.
8.
Turn valve (6) at the bottom of the fuel tank to OPEN posi-
tion (O).
9.
Bleed air from the fuel system.
MACHINE OPERATIONS AND CONTROLS OPERATION
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