DEEP GROOVE BEARING

858 943 59 BALL BEARING Typically found inside the drifter's rotation unit, this bearing supports the main drive shaft that turns the drill steel. Its job is to handle the intense forces generated during both rotation and percussion. By maintaining precise alignment, it allows the drill string to turn efficiently while absorbing the constant vibration of the impact mechanism.

A worn bearing has a direct effect on drilling accuracy and equipment health. As it degrades, you might notice the drill steel wobbling slightly, which leads to oval holes and poor energy transfer to the rock. This inefficiency not only slows down penetration rates but also puts extra stress on the rotation motor and gears, risking a more costly breakdown.

Listen for any grinding or whining sounds coming from the drifter, as this is a classic sign of bearing failure. Another symptom is excessive heat in the front end of the drifter body. To avoid unexpected downtime, these bearings should be replaced as part of a scheduled drifter service or overhaul, not after they fail.