Stihl MSA 140 C-BQ Instruction Manual - Page 54
WARNING, Marking a, Saw Chain Pitch
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English WARNING Never use a dull or damaged chain. This leads to increased physical strain, increased vibration load, unsatisfactory cutting results and increased wear. If the chips from cutting are fine, more like saw dust than wood chips, the chain likely is dull. ► Switch off the chain saw, engage the chain brake and remove the battery. 1 2 24 Inspection and Maintenance STIHL chain is manufactured with wear marks to help the operator identify excessive wear. The wear marks depicted above (1 - 4) must remain visible. ► Replace the chain if any wear marks are no longer visible. ► Check the 30° sharpening angle of the cutters with a STIHL file gauge matching the pitch of the chain. ► If the sharpening angle is incorrect, file the cutters to a 30° angle. ► If you are unable to achieve the proper angle, or suspect you have not achieved the proper angle, have the chain sharpened by an authorized STIHL servicing dealer. An improperly filed chain can be very dangerous. It can increase the potential for reactive forces, including kickback, and also increase the magnitude of those reactive forces. 0000-GXX-1218-A0 0000-GXX-1446-A0 ► Check the height of the depth gauge (1) with a STIHL file gauge (2) matching the pitch of the chain. ► If the depth gauge protrudes higher than the file gauge, file the depth gauge to the appropriate height. ► Work carefully. Do not file the depth gauge too low. A depth gauge that is too low must be replaced or sharpened by an authorized STIHL servicing dealer, as it can increase the kickback tendency of the chain saw and can increase kickback forces. 1 2 3 4 a The chain pitch marking (a) is embossed in the area of the depth gauge of each cutter. The markings mean the following: Marking (a) 1 2 3 4 6 7 Saw Chain Pitch 1/4" .325" 3/8" .404" 3/8" PICCO 1/4" PICCO 0000-GXX-1372-A0 52 0458-716-8621-E