Komatsu PC290LC-11 Operation & Maintenance Manual page 286

MACHINE OPERATIONS AND CONTROLS
METHOD FOR LOCKING DEF TANK FILLER CAP COVER
1.
Hold handle (1), and pull up stay (3) to the direction of the
arrow while supporting the cover.
2.
Remove stay (3) from lock position (4).
3.
Check that stay (3) is set in guide groove (5), and then
lower the cover.
Check that lock (2) is applied.
4.
Turn the key clockwise to lock, and remove it.
Position (A): OPEN
Position (B): CLOSE (LOCK)
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OPERATION