A member of the Precision Products family of companies
ISO 9001 Registered630-543-9570sales@oc-gear.com
Overton Chicago Gear
Gearing
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630-543-9570
HomeIndustriesMining
Heavy Drives

Mining

Bevel, spur, and girth gearing for cone crushers, mills, shovels, and earth-moving equipment.

Built for mining

We service mining market leaders with superior bevel gearing prevalent throughout the industry. The largest cone crushers used in mining metals, gemstones, and commodities — as well as smaller aggregate crushers — use our straight tooth, curved tooth spiral bevel, and skewed bevel gears. Our spur and helical gears drive earth-moving trucks, kilns, and shovels.

Challenges we solve

  • Continuous shock and reversing loads on mill and crusher drives
  • Geared shafts to 120 inches and gears to 160-inch diameter
  • Gear segments that assemble into large girth gears
  • Internal ring gears and splined planet carriers for wheel drives

By the numbers

160"
Gears up to
120"
Geared shafts
Press
Quench hardened

Recommended gearing

  • Bevel Gears
  • Spur Gears
  • Repair & Reverse Engineering
Request a quote

Other industries we serve

Oil & Gas

Oil & Gas

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Fracturing

Fracturing

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Marine

Marine

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Let's build the gearing your equipment depends on.

Send us a print, a sample, or a set of requirements. Our engineers will help you spec the right gearing and get precision parts back to you fast.

Overton Chicago Gear

A full-service manufacturer of precision open gearing and custom gearboxes since 1888. A founding member of AGMA, made in Addison, Illinois.

630-543-9570sales@oc-gear.com

530 Westgate Drive, Addison, IL 60101

Gearing

  • Spur Gears
  • Helical & Double Helical
  • Bevel Gears
  • Worm Gears
  • Custom Gearboxes
  • Repair & Reverse Engineering

Company

  • About Us
  • Gearing
  • Capabilities
  • Industries
  • Request a Quote
  • Contact

Capabilities

  • 5-Axis Gear Milling
  • Carburizing & Press Quenching
  • Gear Metrology Lab
  • Contract Machining
  • Reverse Engineering

© 2026 Overton Chicago Gear. Part of the Precision Products Machining Group.

ISO 9001 RegisteredAGMA Founding Member · Est. 1888
Carved byChisel&Co.