... pumping unit 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 ... . Lubrication grease is supplied by central lubrication system, reducing manual maintenance.6. The unit has comprehensive safety protection, the ...