Four actions work together
Hydraulic rock drilling combines percussion, feed, rotation and flushing. The piston moves back and forth, transmitting impact energy through the shank adapter, coupling and drill rod to the bit. Feed keeps the tools against the rock face and helps withdraw them after a hole is completed.
Rotation moves the bit to a new position between impacts; flushing supports the drilling process. Consider the complete drilling system when investigating a problem.
Identify the assemblies
The guide describes the percussion mechanism, rotation mechanism, shank rebound absorption device and front head. The percussion assembly includes the cylinder, piston, reversing valve, accumulator, guides and seals.
Before selecting a part, identify its assembly and the complete rock drill model. Check the part number, old-part photographs and version; a shared name alone does not establish compatibility.
Prepare a parts request
A nameplate and clear photographs of the old part and its location help distinguish similar items.
- Complete rock drill model and version
- Part number and photographs of the old part
- Quantity and delivery destination
Source: GLOBMACH Hydraulic Rock Drill Parts Selection Guide, printed pages 60–62.