The oil pump delivers lubricant to the bar and chain of the Oleo-Mac chainsaw. It is driven from the engine shaft and works while the saw is running. Oil pump for the Oleo-Mac 937/941C/GS/370/GS410C chainsaw, for EFCO 137/141S/MT3700/MT4100S. Country of origin: China.
Signs of a fault: the bar is dry, the chain overheats and smokes, oil is barely consumed. Before replacement, clear the oil channel and check the hose and the pump drive.
