From Steam Shovels to Hydraulic Giants
O&K’s journey into excavator manufacturing began in 1908 with the production of its first steam shovel. The company continued to develop rope-controlled excavators for decades. However, a significant shift occurred in 1961 with the introduction of O&K’s first hydraulic excavator, the RH5. This groundbreaking machine marked a turning point in excavator technology and paved the way for future advancements. One of these early RH5 models is still preserved at the Dortmund factory, a testament to O&K’s enduring legacy.
The RH5 remained in production until 1966, when it was replaced by the RH4. O&K continued to expand its hydraulic excavator line, introducing five new models in 1967, including the RH15. This model, often configured as a face shovel, quickly gained popularity in loading applications.
The RH15 was later complemented by the larger RH25. Both models were frequently seen on construction sites across Germany, often operating with their engine bonnets open, possibly to enhance airflow for the Deutz air-cooled engines.
O&K’s Dominance in Mining Excavators
O&K’s ambition extended to the heavy mining sector, where the company eventually made its most significant impact. In 1971, just a decade after launching its first hydraulic excavator, O&K unveiled the RH60, a 124-ton behemoth with an 8.5 cubic yard face shovel bucket capacity. This machine, powered by twin Deutz diesel engines generating 760hp, represented a major step forward in mining excavation.
O&K continued to push the boundaries of mining excavator technology. The 2,419hp RH200, launched in 1989 with a 34 cubic yard bucket capacity, found success in opencast coal mining operations worldwide.
In 1997, O&K set a new industry standard with the RH400, an 800-ton (later upgraded to around 1000 tons) excavator boasting a 57 cubic yard bucket and a combined 3,350hp from its dual Cummins engines. This machine solidified O&K’s reputation as a leader in large-scale mining equipment.
The Legacy of Orenstein & Koppel
While O&K no longer exists as an independent entity, its legacy lives on in the machines that continue to operate in mines and construction sites around the globe. The innovative spirit and engineering prowess that characterized O&K’s excavators remain a benchmark for the industry.
