Komatsu PC138US-11 Operation & Maintenance Manual page 201

OPERATION
NOTICE
If the water inside transparent cup (2) freezes, wait until the frozen water has melted completely,
then follow the procedure to drain the water.
REMARK
• If transparent cup (2) is dirty or it is difficult to see the inside, clean transparent cup (2) when replacing
fuel prefilter cartridge (1).
• When the drain valve (3) has been removed during the cleaning operation, coat O-ring with grease and
tighten until it contacts the bottom.
3.
Put a container to receive the water under drain hose (4).
4.
Loosen the drain valve (3) and drain the water.
5.
When fuel starts to drain from drain hose (4), tighten drain valve (3) immediately.
6.
Close the fuel filter inspection cover on the right side of the machine.
METHOD FOR ADJUSTING DRAIN VALVE
If drain valve (3) is stiff, coat O-ring of the drain valve with grease to make the movement smooth.
1.
Open the fuel filter inspection cover on the right side of the
machine.
2.
Set valve (5) to CLOSE position (S).
3.
Place a container under the fuel prefilter cartridge to re-
ceive the fuel.
4.
Loosen the drain valve (3) and drain water and sediments
from transparent cup (2), and also drain all the fuel from
fuel prefilter cartridge (1).
5.
Check that nothing more comes out from drain hose (4),
then remove drain valve (3).
6.
Apply a suitable amount of grease to O-ring (6).
REMARK
When applying grease, be careful not to allow the grease
to adhere to the drain port (7) and the threaded portion (8)
of the drain valve.
7.
Tighten the drain valve (3) by hand until it contacts the bot-
tom of transparent cup (2).
8.
Remove the container for catching the drained fuel.
9.
Turn valve (5) to OPEN position (O).
MACHINE OPERATIONS AND CONTROLS
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