A pumpjack (also known as nodding donkey) is the popular name for the aboveground part of a pump that pumping oil from the ground.
With the use of a drilling rig, a well is drilled to the oil field, and a pipe is connected to the source to a submersible pump. This pump is located deep under the ground, and is driven by an electric motor placed above ground.
The Nodding Donkey is responsible for the mechanical transmission to the piston in the underground pump. It is used to mechanically lift liquid out of the well if there is not enough bottom hole pressure for the liquid to flow all the way to the …