Genuine Hydraulic Motor of Atlas Copco RD22U in Italy

Italy's infrastructure tunneling—the Brenner Base Tunnel from the Austrian border through the Dolomites, the Genoa third harbor access tunnel through Ligurian flysch, and hard-rock quarrying in Carrara and Sardinia—puts the RD22U's hydraulic rotation motor in operating conditions that combine high geological variety with strict component traceability requirements. Italian civil infrastructure contracts specify that hydraulic components on underground equipment must be documented to original equipment specification—a procurement clause that emerged after a series of motor seal failures on aftermarket substitutes disrupted tunnel schedule on the A14 motorway expansion project.

The RD22U genuine hydraulic motor is the rotation drive for the percussion circuit's shank adapter. Its internal vane or gear assembly maintains shaft speed within a tight RPM tolerance across a range of rotation load conditions—from free-spinning positioning cycles to full-torque drilling in the hard limestone and dolomite of the Alps. The motor's internal seals determine how much hydraulic oil bypasses from the high-pressure side to the drain rather than converting to shaft rotation. As those seals wear, bypass fraction increases, effective rotation torque drops, and the motor runs hotter from the wasted energy.

Hydraulic Motor Performance Indicators — Italian Tunnel Applications

Italian tunnel contractors have standardized on quarterly motor drain flow rate checks as the primary motor health indicator—the test requires 5 minutes and a calibrated flow meter, catches bypass seal wear before it produces visible heat or rotation loss, and is recorded in the maintenance log as a QA checkpoint for the contract administrator. HOVOO supplies genuine-specification RD22U hydraulic motors with OEM internal seal dimensions and documentation for Italian civil infrastructure projects. Full references at hovooseal.com.