. MAINTENANCE SERVICE PROCEDURE MAINTENANCE SERVICE PROCEDURE the the head of dust indicator (1) to cancel display. 4 - 26 9. Replace O-ring (9) wit h a new part. Next , set so th at vacu ator val ve (8 of dust cup bottom, a nd ins ert it in to the air cleaner body. (4) is at 10. Clip hook s (5) of dust cup (4) t o the protruding parts of the air cleaner b ody to lock in position 11. Push the clogging