Customer Success Story
TAKRAF GmbH can look back on nearly 200 years of experience in the fields of open cast mining equipment and bulk materials handling equipment. In the late nineties, TAKRAF developed a new generation of large gearboxes for bucket wheel excavators; currently more than 20 of them are in operation in mines all over the world.
Benefits
Due to the solution developed by Schaeffler, the gearbox did not have to be dismounted completely and taken to a workshop. The bearing was replaced without quality losses on site during a scheduled shutdown. In this way, the amount of work and cost of the bearing replacement were reduced significantly.
Challenge
Solution
What's Special
To ensure that the bearing replacement would be carried out successfully, Schaeffler and TAKRAF worked closely together from the planning stage on. The preparations for every step of the dismounting and mounting procedures were made very carefully. Special tools for removing the inner ring segments of the old bearing from the housing and for removing the locking ring bolts on the inside of the bearing were made and then tested jointly by Schaeffler and TAKRAF experts at the workshop under simulated conditions.
Technical Information
Technical Information about the Plant
Bucket wheel gearbox of a bucket wheel excavator
Capacity: 14,000 m³/h overburden
Drive power: 2 x 1 250 kW
Output torque: 6 600 kNm
Weight: 80 000 kg
Speed: 990 / 3,61 min-1
Technical Information about the Solution
Bearing: FAG cylindrical roller bearing Z-531338.ZL
Bore diameter: 1 400 mm
Outside diameter: 1 700 mm
Width: 225 mm
Mass: 910 kg
Dynamic load rating: 5 400 kN
