Komatsu PC220LC -8 Operation & Maintenance Manual page 169

MACHINE OPERATIONS AND CONTROLS
Check for Water and Sediment in Water Separator, Drain Water
1. Open the pump room door on the right side of the machine.
The water separator forms one unit with fuel pre-filter (1).
2. It is possible to judge the water level and amount of sediment
by looking through transparent cap (2). If there is any water or
sediment collected at the bottom, set a container to catch the
drain water under drain hose (3).
3. Loosen drain valve (4) and drain the water.
4. When fuel starts to drain from drain hose (3), tighten drain
valve (4) immediately.
(Machine of poor fuel arrangement specification)
Additional water separator (2a) is installed.
Drain the water and sediment in the additional water separator (2a)
according to the above procedure.
On this machine, a sensor is installed to detect if water is
accumulated in transparent cap (2).
When the water separator monitor (5) lights up red on the machine
monitor, it indicates that water is accumulated in transparent cap
(2).
In this case also, use the procedure above to drain the water.
REMARK
When only the water separator monitor lights up, it lights up in the
position shown in the diagram on the right.
If other monitors also light up the same time, the water separator
monitor lights up at a different position.
NOTICE
If the water accumulated in transparent cap (2) freezes, the water separator monitor may not light up. After the engine is
started, as the temperature around fuel pre-filter (1) increases, the frozen water will melt and the water separator monitor may
suddenly light up. In cold areas, even if the water separator monitor does not light up, drain the water frequently.
If the water inside transparent cap (2) freezes, check that the frozen water has melted completely, then use the procedure above
to drain the water.
REMARK
If transparent cap (2) is dirty or it is difficult to see the inside, clean transparent cap (2) when replacing fuel
pre-filter cartridge (1).
When the drain valve (4) has been removed during the cleaning operation, coat the O-ring with grease and
tighten until it contacts the bottom.
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OPERATION