BOLTING HEAD

780 907 76 BOLTING HEAD Located at the front of the drifter, this component holds the bearings that support the shank adapter and drill steel. It is responsible for absorbing the immense radial and axial forces generated during percussion and rotation. Proper alignment within the BOLTING HEAD is essential for transferring impact energy efficiently from the piston, through the drill string, and into the rock.

Wear or damage to this part directly impacts drilling accuracy and the lifespan of related components. If the bearing seats become worn, it can cause the shank adapter to run out of true, leading to crooked holes and accelerated wear on the drill steel and chuck bushings. A crack in the BOLTING HEAD can lead to a sudden and catastrophic failure of the drifter's entire front end assembly.

During a drifter overhaul, always inspect the BOLTING HEAD for any signs of cracking or deformation, especially in the bearing bores. Check for excessive play in the shank adapter, as this often points to wear in this component. If significant wear or any cracks are found, replacement is necessary to restore drilling performance and prevent a major breakdown.