Honda HT3810 Owner's Manual page 39

4. Lower the cutter deck and loosen the belt tension adjusting knob (page,
20). Raise the pulley on the tensioner arm side, then remove the belt from
the pulleys starting with the one on the opposite side. Remove the belt
from the cutter deck driven pulley. Remove the six yellow colored lock pins
(three on each side), and remove the cutter deck from the tractor.
CAUTION: When the cutter deck is removed, the return spring will cause
the deck height adjusting lever to snap upward when the release button is
pressed. Hold the lever firmly, and carefully return it to the UPPER position
after removing the deck.
LOCK PIN
5. Turn the cutter deck upside down. Clean the underside of the deck with
water, and dry thoroughly.
6. For longer service and greater efficiency, keep the underside of the
mower housing clean and free of accumulated grass clippings by
washing it down with a hose after use and/or cleaning it with a wire
brush and scraper. Remove any rust and apply a rust-resistant paint.
Cleaning and rust prevention are especially important before seasonal
storage.