Loads on the shank adapter
The guide describes the shank adapter as transmitting percussion and rotation energy, with impact from the piston and torsional load from the rotation motor. Its RD18U example shows shank breakage and identifies the thread root, threaded section and flushing hole as possible damage locations.
Damage location is a clue rather than proof of a cause. Record the full model, operating conditions and condition of the old part.
Lubrication and the guide sleeve
The guide identifies an air-lubrication fault as a major contributor to rear guide-sleeve breakage, and recommends checking the head's oil-air spray and the oil film on the shank before each shift. Follow the manufacturer's requirements for the actual service interval, lubricant and inspection method.
If a problem is observed, document the shank, guide sleeve and lubrication condition for a technician to assess in the context of the machine.
Find related parts
Use the RD18U nameplate, full version information and old part number to check the shank, guide sleeve or seals in the parts directory. Confirm each part number and configuration for the exact unit.
Source: GLOBMACH Hydraulic Rock Drill Parts Selection Guide, printed pages 118 and 123.