Stihl MS 310 Product Instruction Manual - Page 51

English / USA 689BA047 KN : Always file from the inside to the outside of the cutter. : The file only sharpens on the forward stroke - lift the file off the cutter on the backstroke. : Avoid touching the tie straps and drive links with the file. : Rotate the file at regular intervals while filing to avoid one-sided wear. : Use a piece of hardwood to remove burrs from cutting edge. : Check angles with the filing gauge. All cutters must be the same length. 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. : Find the shortest cutter and then file all other cutters back to the same length. This can be very time consuming - it is best to have it done in the workshop on an electric grinder. Depth gauge setting a 689BA023 KN The depth gauge determines the height at which the cutter enters the wood and thus the thickness of the chip removed. Specified distance or setting between depth gauge and cutting edge = a: This setting may be increased by 0.2mm (0.008") for cutting softwood in mild weather season - no frost. Chain pitch Inch 1/4 3/8 PMN 3/8 PM, PMMC3 0.325 3/8 0.404 (mm) (6.35) (9.32) (9.32) (8.25) (9.32) (10.26) Depth gauge setting "a" mm (inch) 0.65 (0.026) 0.45 (0.018) 0.65 (0.026) 0.65 (0.026) 0.65 (0.026) 0.80 (0.031) Lowering depth gauges The depth gauge setting is reduced when the chain is sharpened. : Use a filing gauge to check the setting every time you sharpen the chain. 1 : Place a filing gauge (1) that matches the chain pitch on the chain - if the depth gauge projects from the filing gauge, the depth gauge has to be lowered. : File down the depth gauge until it is level with the filing gauge. 689BA051 KN 50 MS 290, MS 310, MS 390