Stihl 056 Instruction Manual - Page 26

Replacing the chain sprocket On machines with chain brake The chain brake must be disengaged before the chain sprocket cover can be removed - pull hand guard back toward handlebar. Top: Loosening the hexagonal nut Bottom: Tightening the carrier (standard clutch) First remove chain sprocket cover and bar and chain. Loosen and unscrew spark plug with combination wrench. Put clutch wrench through the slots of the outer cover plate between the clutch shoes. Turn crankshaft in such a way that the boring provided in the handle of the clutch wrench is in line with the bar stud and then insert the tube 1115 893 4200 through this boring onto the stud. Loosen crankshaft nut with a ring wrench SW 19. Attention! Crankshaft nut and carrier have left hand thread -loosen in clockwise direction! After unscrewing the nut remove outer guide washer, wrench and tube. Now screw locking screw into the cylinder by hand until it has a snug fit. Turn crankshaft in clockwise direction until the piston top rests against the locking nut, loosen and unscrew carrier with clutch wrench. Now the inner guide washer, chain sprocket, needle cage and cover plate can be removed from the crankshaft. Before reassembly clean bull end of crankshaft, wash needle cage in clean gasoline and apply ball bearing grease. Check drive pin in cover plate. If it is twisted insert 24 a new one; a worn out boring must be replaced. Reassembling is1lone in reverse sequence a/disassembly. W,hen pulling' on the chain sprocket care must be taken that the drive pin engages into the boring of the chain sprocket. The beaded edge at the cover plate and at inner guide plate must point towards the crankcase, Tighten carrier with clutch wrench. Mount outer cover plate in such a way that the elevated area of the inner diameter points towards the carrier. The crankshaft nut must be tightened down securely,