Komatsu WA480-8 Operation & Maintenance Manual page 234

MACHINE OPERATIONS AND CONTROLS
6.
Place the removed cap on the holder (4) inside the cover
(2).
Bring the magnet (5) on the holder (4) into contact with the
metal plate (6) on the cap and fix them.
NOTICE
If the cap is wrongly placed and foreign materials such as mud and sand are stuck to the cap, it
may disturb the operation of the DEF system.
Be sure to place it correctly.
Correct placement
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OPERATION