The 6002 size crankshaft bearing lets the shaft turn in the crankcase of the STIHL chainsaw. It works at high revs and under load, so it is one of the first parts to wear out. Manufacturer: EMAST.
Signs of wear: play in the shaft, humming and vibration at revs, oil leaks at the oil seals. It is best to replace the bearings together with the oil seals, and to clean the crankcase thoroughly before assembly.
