1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, long service ... strong endurance. Self-aligning bearings are adopted in equalizer beam bearing and crank pin bearing, reducing installationerrors and the ... 51114,000C-114D-173-6417,30064, 54, 44114,000C-l 14D-143-6414,30064, 52, 40114,000C-114D-133- ... 2357,000C-57D-76-427,60042, 33, 2357,000 Beam Pumping Unit