GIRTH GEARS & PINIONS – Design, Manufacture, Repair, Install

GIRTH GEARS & PINIONS – Design, Manufacture, Repair, Install

You can rely on us for a comprehensive range of services for the design, manufacture, repair and installation of girth gears and pinions for use in applications including grinding mills, rotary kilns, dryers and scrubbers.


Drop-in Pinion Assembly

5m Girth Gears

6m Girth & Pinion Mesh Test



We don’t just manufacture new products. We modify and improve existing gear assemblies. Amendments to gear tooth geometry and careful material selection increase flank durability and root strength service factors, while ensuring fitment compatibility with your original gear unit or set.

All calculations are aligned with the latest American Gear Manufacturers Association (AGMA) calculation standards and are subjected to finite element analysis to identify potential stress areas. The latest in gear calculation software, including KISSsoft and Inventor modelling, are essential tools in our design process.



World-class gear grinding technology

Our state-of-the-art gear grinding technology enables us to supply gears of the highest quality. Precision gear components and pinions are manufactured to standards.

Accuracy classes achievable

  • AGMA Q12 and higher
  • Super-fine surface finish (<0,8Ra)


  • Girth gears are manufactured from alloy steel castings with a capacity of up to 150 tons or Ø12.5m per gear set
  • We manufacture pinions and gearbox internals from through-hardened or case-hardened alloy steel forgings
  • Gear tooth and root areas are subjected to grinding with the latest generation Klingelnberg Höfler profile grinding technology, ensuring a high degree of accuracy in gear manufacture
  • An in-board testing head enables the production of gear quality inspection graphs to verify tooth profile, lead, pitch, run out and span values and deviations


  • Steel castings with a capacity of up to 150 tons per gear set
  • Ladle refining is an important feature of our casting process as it removes impurities from the final cast and helps to accurately control chemical compositions
  • We employ the world’s largest liquid quenching facilities to ensure uniform hardness throughout a component
  • Machining and gear hobbing up to Ø12.5m, 1,200mm face width
  • Max module = 42 mod


  • A vacuum degassing furnace is used prior to casting ingots to ensure forgings have high-quality mechanical properties
  • Gear grinding is conducted to a minimum accuracy of AGMA Q12 class or higher