reo(a) API beam pumping unit (API beam pump jacks): 1. Brake equipment 2. Pedestal 3. Electric motor 4. Belt cover 5. Belt 6. Barrel small platform 7. Reducer belt pulley 8.Safty brake equipment 9. Reducer 10. Crank 11. Crank pin 12. Crank counterbalance 13. Connecting rod 14. Rear stand 15. Tail bearing pedestal 16. Beam 17. Anterior stand 18. Ladder 19. Stand platform 20. Intermediate bearing pedestal 21. Mule head 22. Wire rope guard ring 23. Beam mule head junction panel 24. Pin axle 25. Crossbeam 26. Hoist cable 27. Beam hanger 28. Barrel body Advantages: Whole set structure is very reasonable, machine is running smoothly, quiet and easy to operate and maintain; Balance beam chooses box type or H-beam structure, whose strength is high, rigidity is good and carrying capacity is very big; Reducer adopts chevron involutesor double-circular-arc shape gear, whose machining precision is high, carrying capacity is very big and service life is long; Mule head adopts upturns type, on suspension or tips over type; Braking adopts reveals type structure, equipped with safety device, which is flexible to operate, fast to brake and safe reliability; Pedestal adopts foundation bolt joint or pressure lever joint.