ANGULAR CONT.BEARING

853 872 89 BEARING Conical roller bearings are essential for handling the combined radial and thrust forces generated during drilling. Typically located within the drifter's rotation mechanism, this bearing allows the drill chuck and steel to turn smoothly while under heavy forward pressure from the feed system. Its proper function is key to drilling accuracy, as it minimizes wobble and helps maintain the alignment of the entire drill string.

A worn or failing bearing can severely impact rig productivity and reliability. The first signs of trouble are often a rumbling or grinding noise from the drifter, followed by overheating of the rotation unit housing. If a worn bearing is ignored, it can seize completely, causing a sudden stoppage of rotation and potentially leading to significant damage to expensive internal gears and shafts.

During routine checks, feel the drifter's rotation housing for excessive heat after a drilling cycle. When replacing this bearing, it is crucial to clean the housing thoroughly and ensure the new part is installed with the correct preload. Setting the preload too loose or too tight is a common reason for premature bearing failure.