Heavy Intermediate Part of Atlas Copco RD22U in Turkey

Turkey's mining sector—Eti Bakır's Küre copper mine on the Black Sea coast, Koza Gold's Himmetdede operation in Kayseri, and the marble quarries of Afyon and Muğla—operates RD22U drifters across a formation range from soft ophiolitic serpentinite at 60 MPa to hard metamorphic limestone and marble at 140–180 MPa. The intermediate part is the structural housing section that connects the percussion module to the rotation module in the RD22U's split-assembly architecture. It carries the percussion reaction forces through to the feed beam interface and contains the shank lubrication circuit ports that deliver oil to the guide bushing and driver spline.

The intermediate part's shank lube circuit is the detail that Turkish maintenance teams most frequently overlook. The two lubrication ports on the intermediate part face—one supply, one drain—are small-diameter fittings that accumulate thread scale in Turkey's hard-water regions. Küre's mine water carries dissolved calcium and magnesium that deposits on exposed fitting threads during wet-season operation, eventually restricting the lube circuit flow. A lube circuit running at 60% design flow produces spline galling on the driver within 100 hours of the restriction developing—by the time rotation pressure begins rising, the spline damage is already initiated.

Intermediate Part Maintenance Focus Areas

Eti Bakır's Küre maintenance team has added a shank lube port flow check to the weekly equipment inspection—measuring oil flow at the drain port with a graduated container over 30 seconds and comparing to the baseline established at last service. A 20% flow reduction triggers immediate cleaning of the supply fitting. That single addition to the weekly schedule has eliminated driver spline failures from lube restriction at Küre over the past 18 months. HOVOO supplies RD22U intermediate parts for Turkish mining and quarry operations. References at hovooseal.com.