Komatsu WA380-8, Operation & Maintenance Manual, Page: 226 / 432

METHOD FOR CHECKING WATER SEPARATOR, DRAINING WATER AND SEDI-
MENT
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WARNING
• Immediately after the engine is stopped, all of parts are still very hot. Avoid draining water or re-
moving the transparent cup.
Wait for all of parts to cool down before starting the work.
• When the engine has run, high-pressure is generated in the engine fuel piping. When draining the
water or removing the transparent cup, wait for at least 30 seconds after stopping the engine to let
the internal pressure go down before starting the work.
• Do not bring any open flame close.
1.
Open the engine side cover on the right side of the machine.
Water separator (1) is in one piece with the fuel prefilter
and located in the lower part.
2.
Check for water and sediment.
It is possible to judge the water level and amount of sedi-
ment by looking through transparent cup (3).
3.
Place a container to catch the water under drain hose (4).
4.
Loosen plug (2) and drain the water.
5.
When fuel starts to be drained from drain hose (4), tighten
plug (2) immediately to stop draining.
Tightening torque: 0.2 to 0.45 Nm {0.02 to 0.046 kgm}
REMARK
• On this machine, a sensor is installed to detect if wa-
ter accumulates in transparent cup (3).
When the water separator caution lamp (5) lights up in
red on the machine monitor, it indicates that water ac-
cumulates in transparent cup (3).
In this case as well, use the procedure above to drain
the water.
• When only the water separator caution lamp lights up,
it lights up at position (5).
If other caution lamps also light up at the same time,
the lighting up position of the water separator caution
lamp will change.
NOTICE
• If the water accumulated in transparent cup (3)
freezes, the water separator caution lamp may not
light up. After the engine is started, as the temper-
ature around fuel prefilter (1) increases, the frozen
water melts and the water separator caution lamp
may suddenly light up. In cold season, even if the
water separator caution lamp is not lit, drain the
water frequently.
• If the water inside transparent cup (3) freezes,
check that the frozen water has melted completely,
then follow the preceding procedures to drain the
water.
MACHINE OPERATIONS AND CONTROLS OPERATION
3-162