Stihl HT 105 Instruction Manual - Page 32
Maintaining and Sharpening, the Saw Chain
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English 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. WARNING 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 an increased risk of kickback, with resulting risk of injury. The saw chain cannot be locked in place on the guide bar. Therefore, it is best to remove the chain from the bar and resharpen it on a workshop sharpening tool (FG 2, HOS, USG). Chain pitch a The chain pitch (a) is marked on the depth gauge end of each cutter. Mark (a) 7 1 or 1/4 6, P or PM 2 or 325 3 or 3/8 Chain pitch inch mm 1/4 P 6.35 1/4 6.35 3/8 P 9.32 0.325 8.25 3/8 9.32 Select file diameter according to chain pitch - see table "Sharpening Tools." You must observe certain angles when resharpening the chain cutter. Filing and side plate angles A B A Filing angle 30 689BA021 KN 689BA025 KN 689BA027 KN STIHL saw chains are sharpened to a filing angle of 30°. Exceptions are ripping chains with a filing angle of 10°. Ripping chains have an X in their designations. B Side plate angle The correct side plate angle is obtained automatically if you use the prescribed file holder and file diameter. Cutter shapes Angle (°) AB Micro = semi chisel cutter, 30 75 e.g. 63 PM3, 26 RM3, 71 PM3 Super = chisel cutter, e.g. 30 60 63 PS3, 26 RS, 36 RS3 Ripping chain, e.g. 63 PMX, 36 RMX 10 75 The angles must be the same on all cutters. If the angles are uneven: Chain will run roughly, not in a straight line, wear quickly and finally break. File holder N Use a file holder A file holder must be used for manual resharpening (see table "Sharpening Tools"). The correct filing angles are marked on the file holder. HT 105, HT 134, HT 135