Stihl 009 Instruction Manual - Page 44

689BA020 KN 689BA021 KN Maintaining and Sharpening Saw Chain Correctly sharpened chain A properly sharpened chain slices through wood effortlessly and requires very little feed pressure. Do not work with a dull or damaged chain as it will increase the physical effort required, produce unsatisfactory results and a higher rate of wear. Clean and check your chain for cracks in the links and damaged rivets - replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts. It is absolutely essential to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened - and in particular if the depth gauge is set too low - there is a risk of increased kickback of the chainsaw, with resulting risk of injury. : Select sharpening tools according to chain pitch. See "Specifications" for permissible chain pitches. 3/8 The chain pitch (e.g. 3/8") is marked on the depth gauge end of each cutter. Use only special saw chain sharpening files. Other files have the wrong shape and cut. Select file diameter according to chain pitch - see table "Sharpening Tools" at the end of this chapter. You must observe certain angles when resharpening the chain cutter. A B A = Filing angle B = Side plate angle Chain type Rapid-Micro (RM) Rapid-Super (RS) Picco-Micro (PM/PMN) Angle (°) AB 30 85 30 60 30 85 Cutter shapes: Micro = Semi-chisel Super = Full chisel The specified angles A and B are obtained automatically if recommended files or sharpening tools and correct settings are used. 42