Komatsu WA380-6 Operation & Maintenance Manual page 288

MAINTENANCE
PROCEDURE FOR BLEEDING AIR
1. Fill the fuel tank with fuel.
2. Open the engine side cover on the right side of the chassis.
3. Loosen and pull out feed pump knob (1) and move it forward
and backward.
The plug on the side surface of the fuel pre-filter head does
not need to be removed.
Keep moving knob (1) until it becomes heavy.
4. After bleeding air, push in and tighten knob (1).
SERVICE PROCEDURE
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