Rotation bushing and lubrication
The guide describes the rotation bushing transferring the shank's impact reaction to the damping piston. Its damage examples identify inadequate lubrication and fatigue among possible factors. Documenting lubrication, changes on the bushing face and the location of a fracture can help a technician determine what else to inspect.
Similar-looking damage can arise under different operating conditions; an example is not a diagnosis of an individual machine. Follow the manufacturer's lubricant and service interval requirements for the model in use.
Drive sleeve and stop ring
The guide associates premature drive-sleeve wear with factors including insufficient or unsuitable lubrication and drilling beyond the equipment's intended hole diameter. It also points to internal teeth, guide sleeve condition and mating clearance when discussing sleeve damage. Retain photos of these adjacent areas for inspection.
The guide recommends checking the stop ring when replacing the shank and considering its wear or damage. Use the equipment manufacturer's inspection criteria and replacement intervals for the exact model.
Identify the parts before requesting a quote
Provide the complete rock drill model, version and nameplate, along with each part name, part number and quantity. Photograph the whole old part, worn surfaces, splines or connections, and its location in the head. Parts with the same name still need individual configuration and compatibility checks.
Source: GLOBMACH Hydraulic Rock Drill Parts Selection Guide, printed pages 110 and 112–113.