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27 SERVICE AIR FILTER & PRE-CLEANER - 18.5 & 21 HP ENGINES NOTE: Air filter configuration may differ from shown. Consult engine manual for further information. Interval: Pre-Cleaner: Every 25 hours or as required. Air Filter: Every 50 hours or as required. Replacement Interval: Pre-Cleaner: As required. Air Filter: Every 200 hours or once per season. Air Filter Removal & Installation 1. Lift up on the bottom of the latch (A, Figure 37 or 38) and flip the latch away from the cover. 2. Remove the