... 2.Conventional beam pumping unit 3. simple, stable, convenient, long service life pumping unitCharacteristics:1. "H" section steel structure, high strength ... toothed gear, high precision, nice load bearing capacity, and long service life.4. Brake adopts internal expanding or external structure . The ... -119-5411,90054, 45, 3680,000C-80D-133-4813,30048, 40, 3280,000C-80D-109-4810,90048, 37, 2580,000C-57D ...