Komatsu GALEO HM350-2 Operation & Maintenance Manual page 215

SERVICE PROCEDURE SERVICE PROCEDURE
9. Replace O-ring (9) with a new part.
Next, set so that vacuator valve (8) of dust cup (4) is at the
bottom, and insert it into the air cleaner body.
10. Clip hooks (5) of dust cup (4) to the protruding parts of the air
cleaner body to lock in position.
11. Push the head of dust indicator (1) to cancel the clogging
display.
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MAINTENANCE MAINTENANCE