A beam pumping unit includes a base, a Sampson post supported by the base, a walking beam pivotably supported by the Sampson post and a horsehead on the front end of the walking beam, The horsehead is connected to a polished rod that extends through a wellhead to a subsurface pump. Tile beam pumping unit includes a linear drive unit connected between the base and the Sampson post to force the walking beam to rock up and down on the Sampson post. The linear drive unit includes a linear drive system and an integrated pneumatic counterbalance system.
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