Komatsu D155A-6 Operation & Maintenance Manual page 151

OPERATION
DRAIN WATER, SEDIMENT FROM FUEL TANK
Prepare a container to catch the fuel that is drained.
1. Loosen drain valve (1) at the bottom of the fuel tank and drain
the sediment and water accumulated at the bottom of the tank
together with the fuel.
When doing this, be careful not to get fuel over yourself.
2. When clean fuel comes out, close drain valve (1).
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OPERATION