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Gear Boxes for Oil Field Pump Jacks

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These are split gear boxes that P & M has machined for various customers in the
Southwest. They drive the walking beam that pulls the sucker rod up with oil.
These gear boxes were machined in separate half's, then bolted together for final
machining. All the bearing bores had to be in line and sized to a .0005"
tolerance. Customer supplied the castings and final assembly.
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