... , long service life pumping unit 1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient ... . Self-aligning bearings are adopted in equalizer beam bearing and crank pin bearing, reducing installationerrors ... lubrication system, reducing manual maintenance.6. The unit has comprehensive safety protection, the ladder and ... 33, 2357,000 API Conventional Beam Pumping Unit