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Actually it does not matter which way a pumpjack rotates, it still pumps oil either way. the speed at which they move varies greatly due to pressure in the casing and viscosity of the oil. The ones I work with are also dirty and covered in more oil than a big mac. They usually have a small shack at the rear end which houses the one cylinder engine that drives them by a 4 inch wide belt. My info is based only on the ones I have worked on. They vary from each one and they vary from each oil company, so i may not be correct if asked by another oil company field technician.
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