Stihl HT 56 C Instruction Manual - Page 36

English 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 689BA021 KN 689BA025 KN 689BA027 KN 001BA203 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. Use only special saw chain sharpening files. Other files have the wrong shape and cut. For checking angles Use a STlHL filing gauge (special accessory, see table "Sharpening Tools"). This is a universal tool for checking the filing and side plate angles, depth gauge setting, cutter length and groove depth. It also cleans the guide bar groove and oil inlet holes. File correctly N Select sharpening tools according to chain pitch. N If you use an FG 2, HOS or USG sharpener: Remove the chain from the bar and sharpen according to the instructions supplied with the tool. N Clamp the bar in a vise if necessary. N Sharpen the chain frequently, take away as little metal as possible - two or three strokes of the file are usually enough. 34 HT 56 C