Stihl MS 291 C-Q Instruction Manual - Page 51

90° 689BA018 KN If the cutters are not the same length, they will have different heights. This makes the chain run roughly and can cause it to break. N Find the shortest cutter and then file all other cutters back to the same length. It is best to have this work done in the workshop on an electric grinder. Depth gauge setting Lowering depth gauges English The depth gauge setting is reduced when the chain is sharpened. N Use a filing gauge to check the setting every time you sharpen the chain. 689BA043 KN a N Hold the file horizontally (at a right angle to the side of the guide bar) and file according to the angles marked on the file holder. Rest the file holder on the top plate and depth gauge. N Always file from the inside to the outside of the cutter. N The file only sharpens on the forward stroke - lift the file off the cutter on the backstroke. N Avoid touching the tie straps and drive links with the file. N Rotate the file at regular intervals while filing to avoid one-sided wear. N Use a piece of hardwood to remove burrs from the cutting edge. N Check angles with the filing gauge. All cutters must be the same length. The depth gauge determines the height at which the cutter enters the wood and thus the thickness of the chip removed. a Specified distance or setting between depth gauge and cutting edge. This setting may be increased by 0.2 mm (0.008") for cutting softwood in the mild weather season - no frost. Chain pitch inch 1/4 3/8 P 0.325 3/8 0.404 (mm) (6,35) (9,32) (8,25) (9,32) (10,26) Depth gauge setting (a) mm (inch) 0,65 (0.026) 0,65 (0.026) 0,65 (0.026) 0,65 (0.026) 0,80 (0.031) 689BA023 KN 1 N Place a filing gauge (1) that matches the chain pitch on the chain and press it against the cutter - if the depth gauge projects from the filing gauge, the depth gauge has to be lowered. N File down the depth gauge until it is level with the filing gauge. 689BA047 KN 689BA051 KN MS 291 C-Q 49