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Guide to Pump Jack Maintenance and Care A pump jack system is a simple machine, which is exactly why crews stop looking at it. Two poles, two jacks, a crank and a platform - nothing to service, nothing to fail. Except the poles take a beating, the feet wear into the ground, and the parts that hold the setup together are the cheapest pieces on the truck and the first ones to go missing. Start With the Poles Poles are the structure. Check them for bends and dents, especially near the ends where t …