Stihl MS 311 Product Instruction Manual - Page 38

4903BA002 KN 4903BA006 KN English Air Filter System Cleaning the Air Filter 1 The air filter system can be adapted to different operating conditions by the insertion of different air filters. Retrofitting is simple. Depending on equipment version, the machine is equipped with a felt filter or a fabric filter. Felt filter For normal, dry or very dusty operating environments. Fabric filter For extreme winter conditions (e.g., powdered or drifting snow or frost formation). If there is a noticeable loss of engine power Remove shroud N Move the Master Control lever to the stop position 0 N Push the hand guard forwards - the saw chain is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Remove air filter N Clean away loose dirt from around the filter Do not use tools to remove and install the air filter - the air filter could be damaged in the process. N Push the clip (1) up and to the rear and tilt the air filter toward the rear handle and remove it N always replace a damaged filter Cleaning the air filter N Knock out the filter or blow it clear with compressed air from the inside outwards. In case of stubborn dirt: N Wash the parts of the filter in STIHL special-purpose cleaner (special accessories) or a clean, nonflammable cleaning liquid (e.g., warm soapy water) and dry them. Do not clean fleece filters with a brush! 36 MS 311, MS 391