Stihl MS 251 WOOD BOSS174 Product Instruction Manual - Page 59

Chain sprocket 6-tooth for 3/8" (spur sprocket) 7-tooth for .325" (spur sprocket) To comply with the 45 degree computed kickback angle requirement of Section 5.11 of ANSI/OPEI B175.1-2012, use replacement saw chains listed above or elsewhere by STIHL as conforming with that requirement when used on this model chain saw or use saw chains classified as "low kickback" in accordance with ANSI/OPEI B175.1-2012. Since new bar/chain combinations may be developed after publication of this Manual, ask your STIHL dealer for the latest STIHL recommendations. Ordering Spare Parts Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make reordering simpler. The guide bar and saw chain are subject to normal wear and tear. When purchasing these parts, always quote the saw model, the part numbers and names of the parts. Model Serial number Guide bar part number Chain part number See "Specifications" in this manual for the recommended reduced kickback cutting attachments. English Maintenance and Repairs Users of this unit should carry out only the maintenance operations described in this manual. STIHL recommends that other repair work be performed only by authorized STIHL servicing dealers. Except for the emissions control systems and parts, which are governed by the Federal Emission Control Warranty provided elsewhere in this manual. Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL servicing dealer using genuine STIHL replacement parts. Genuine STIHL parts can be identified by the STIHL part number, the { logo and, in some cases, by the STIHL parts symbol K. The symbol may appear alone on small parts. For repairs of any component of this unit's air emissions control system, please refer to the air emissions systems warranty in this manual. MS 251, MS 251 C 57