Komatsu PC138USLC Operation & Maintenance Manual page 176

OPERATION
Check Dust Indicator
1. Open the cover at the rear of the cab and check that the red
piston is not showing in the part of dust indicator (1) shown by
the arrow.
2. If the red piston has appeared, clean or replace the element
immediately.
For details of the method of cleaning the element, see
"CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT
(PAGE 4-17)".
3. After checking, cleaning, or replacing the air cleaner element,
press the knob of dust indicator (1) to return the red piston to its
original position.
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.
NOTICE
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.
MACHINE OPERATIONS AND CONTROLS
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