... 1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, ... endurance. Self-aligning bearings are adopted in equalizer beam bearing and crank pin bearing, reducing installationerrors and ... 000C-228D-213-8621,30086, 71, 56228,000C-228D-200-7420,00074, 64, 54228,000C-228D-173-7417, ... -160D-173-8617,30086, 74, 62160,000C-160D-200-7420,00074, 64, 54160,000C-160D-173-7417, ...