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In 1991, JSE-listed platinum-miner Northam Platinum had commissioned an original-equipment circular stacker reclaimer from global integrated and materials group ThyssenKrupp Materials Handling (TKMH), for the replacement of slew bearings.
However, during 2009, problems with the slew bearings on the stacker became evident and TKMH was requested to conduct an on-site inspection of the equipment with specific reference to the conditions of the slew bearings.
Following the inspection, TKMH product support staff and Northam mine management entered into discussions and deliberations around the refurbishment project. Various issues were finalised, including the final scope of work, as well as a feasible schedule for the execution of the work. TKMH secured the refurbishment contract in December 2009.
When the circular stacker was originally installed and commissioned, TKMH recommended that critical spares such as slew bearings with a long delivery lead time be kept in stock to reduce downtime and simultaneously limit the high cost of alternative interim materials handling options. With the replacement bearings in stock, construction work started in January 2010.
The circular stacker weighs 168 t and is fitted with two slew bearings with diameters of 1,70 m and 2 m weighing 300 kg and 650 kg respectively.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 694ZZ KOYO | 4 | 11 | 4 |
| WML4010ZZ KOYO | 4 | 10 | 3 |