Lakeisha Williams
Lakeisha Williams voted up Arthur Wright's answer

Im going to take it that youre talking about chain saws here which the chain pump is an internal pump that lubricates the saw blade itself everytime it spins so it cuts cleaner and easier and saves wear on the chain itself

Lakeisha Williams
Lakeisha Williams voted up Anonymous' answer

The chain pump is type of a water pump in which several circular discs are positioned on an endless chain. One part of the chain dips into the water, and the chain runs through a tube, slightly bigger than the diameter of the discs. As the chain is drawn up the tube, water becomes trapped … Read more