The crankshaft converts the motion of the piston into rotation and transmits it to the clutch of the Good Luck chainsaw. The connecting rod, bearings and flywheel are mounted on it.
It has to be replaced if there is play in the connecting rod, the journals are worn, there is runout, or the seats are damaged. Signs: vibration, metallic knocking, loss of compression. When replacing the shaft, the bearings and oil seals are usually replaced too.
