Stihl MS 171 Product Instruction Manual - Page 50

689BA027 KN English Install spur chain sprocket / rim sprocket N Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) N Slide needle cage onto the crankshaft stub N After refitting, turn the clutch drum and/or spur chain sprocket approx. 1 full turn so that the carrier for the oil pump drive engages N Refit the rim sprocket - cavities toward the outside N Refit washer and E-clip on the crankshaft Maintaining and Sharpening the Saw Chain Cutting effortlessly with a 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. N Clean the chain. N Check the chain for cracks in the links and damaged rivets. N Replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts. Carbide-tipped saw chains (Duro) are particularly wear resistant. STIHL recommends you have your chain resharpened by a STIHL servicing dealer. 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 saw, with resulting risk of injury. a The chain pitch (a) is marked on the depth gauge end of each cutter. Mark (a) 1/4 or 1 P, PM or 6 325 or 2 3/8 or 3 404 or 4 Chain pitch inch mm 1/4 6,35 3/8 P 9,32 0.325 8,25 3/8 9,32 0.404 10,26 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". You must observe certain angles when resharpening the chain cutter. A B A Filing angle B Side plate angle 689BA021 KN 48 MS 171, MS 181, MS 181 C, MS 211, MS 211 C