... 1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, ... 1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, long ... endurance. Self-aligning bearings are adopted in equalizer beam bearing and crank pin bearing, reducing installationerrors and ... ,000C-114D-173-6417,30064, 54, 44114,000C-l 14D-143-6414,30064, 52, 40114,000C-114D ...