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If the strips become bent back, they can be unbolted and turned around to improve clean out. Upper Auger Knives can be turned over for use of a new cutting edge and should be periodically sharpened, or replaced if they are no longer sufficiently breaking up material. Lower auger knives can be rotated several times before sharpening or replacement is required. Motor fan guard must be kept clean to allow sufficient air flow for proper motor cooling. Drive belts must be checked for wear and hardnes