At Specialty Gear Drives, we specialize in ball mill pinion gearbox repair, girth gear manufacturing, and rotary kiln drive rebuilds for mining, cement, power, and aggregate operations. Our in-house gear manufacturing center produces replacement girth gears up to 20 feet in diameter — matching OEM Rockwell and Brinell hardness specifications.
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Ball mill and rotary kiln girth gears are among the largest and most demanding components in industrial machinery. Specialty Gear Drives manufactures replacement girth gears up to 20 feet in diameter — matching the exact Rockwell and Brinell hardness ratings of OEM manufacturers including Chaeng, Rexnord, and Chaeng Casting. When your girth gear is beyond repair or replacement through OEM channels is cost-prohibitive, we are the solution. All girth gears are manufactured and inspected in-house with complete dimensional control at every stage of production.
Mining, Cement & Industrial Mill Drive Experts
Ball mills and rotary kilns in mining, cement, power, and aggregate operations run 24 hours a day under enormous mechanical loads. When the pinion gearbox, girth gear, or drive system fails, the entire production circuit can stop. Specialty Gear Drives has the engineering capability and large-scale manufacturing equipment to repair every component of a ball mill drive system — from the pinion gearbox to the girth gear itself.
Our endoscopic camera assessment, backlash and endplay measurement, and complete dimensional analysis give you a full picture of your drive system’s condition before any repair scope is committed. When gears or shafts are beyond repair, we manufacture them on-site — eliminating OEM lead times and reducing total repair cost significantly.
Full Ball Mill Drive Coverage
We repair and manufacture every critical component in a ball mill or rotary kiln drive system — from the pinion gearbox all the way to the girth gear itself.
The primary reduction gearbox driving the pinion gear in ball mill and kiln applications. We fully disassemble, inspect, and rebuild pinion gearboxes across all makes and configurations to exact OEM dimensional specifications.
Large-diameter split girth gears manufactured on-site up to 20 feet in diameter, matching the Rockwell and Brinell hardness ratings of OEM manufacturers including Chaeng and Rexnord. Spur and helical profiles available.
Complete rotary kiln drive assembly service — pinion shaft, gearbox, girth gear, and trunnion bearing systems. We handle all configurations across cement, lime, and industrial processing kilns.
Pinion gears and shafts subject to extreme contact stress from girth gear mesh are reconditioned or manufactured new in our CNC gear cutting center — matching original profile geometry and surface hardness.
Ball mill drive shafts experiencing fretting, keyway damage, or journal wear are reconditioned in our machine shop to restore all critical diameters and surface finishes to OEM specification.
Endoscopic camera assessment of bearings and gears. Backlash and endplay measurement compared against OEM ball mill gearbox specifications. Full diagnostic report before any repair commitment is made.
From large girth gears to pinion profiles, we manufacture every component of a ball mill or rotary kiln drive system on-site to OEM hardness and dimensional tolerances.
Ball mill and rotary kiln drive systems operate under some of the highest sustained mechanical loads in any industrial application. We diagnose the exact root cause before any repair begins.
The pinion-to-girth gear mesh experiences massive contact forces during continuous milling operations. Progressive surface fatigue, pitting, and tooth wear reduce efficiency and eventually cause catastrophic failure.
Thermal cycling, impact loads from mill charge, and foundation settling cause girth gear segment cracking. We assess cracking severity and determine whether repair or full replacement manufacture is the correct path.
Pinion shaft bearings carry enormous radial loads from girth gear mesh forces. Premature failure from lubrication breakdown, misalignment, or overloading is one of the most common ball mill drive failures.
Foundation settling, improper shimming, and thermal expansion cause pinion-to-girth gear misalignment — creating uneven tooth contact, accelerated wear, and progressive drive train damage if left unaddressed.
Worn shaft seals in the pinion gearbox allow lubricant escape and mill dust infiltration — a combination that rapidly accelerates internal gear and bearing wear throughout the drive system.
Shock loading from mill charge impacts and drive train torsional vibration cause shaft fretting, keyway damage, and journal wear requiring precision reconditioning or new shaft manufacture.
Bearing migration under sustained radial and axial loads causes housing bore wear in pinion gearboxes. Precision line-boring restores all critical diameters to OEM tolerances in our machine shop.
Continuous-duty milling operations with inadequate lubrication maintenance cause thermal damage to pinion gears, bearings, and seals — accelerating wear rates throughout the entire drive train.
Every ball mill pinion gearbox and drive component receives our full documented rebuild — from initial assessment through final test certification and 24-month warranty.
On-site endoscopic camera inspection provides photos of bearings and gears before teardown. We measure backlash and endplay and compare against OEM specifications to scope the full repair requirement accurately.
We arrange no-cost freight pickup for gearbox components. Full disassembly, industrial cleaning, and dimensional measurement of every component against ball mill OEM tolerances.
Root cause documentation and a detailed repair authorization report covering all damaged components, required manufacturing, and final scope of work — before any repair begins.
Pinion gears, shafts, and girth gears manufactured on-site to OEM hardness specifications. Girth gears up to 20 feet in diameter produced in our CNC gear cutting center — no dependence on OEM casting lead times.
Reassembly uses Timken-certified bearings installed via liquid nitrogen thermal process. All new seals, gaskets, and high-temp polymer housing coating complete the rebuild to better-than-OEM standard.
Every rebuilt ball mill pinion gearbox completes a full load test monitoring vibration, temperature, and leak-tightness before shipping with our 24-month production warranty.
We manufacture Ball Mill gears on-site. No OEM backorders — just precision parts cut to spec and ready in days.
Every Ball Mill rebuild is covered from the moment it goes back into production — the strongest guarantee available.
Pickup and delivery at no cost to you, anywhere in the U.S. We handle all logistics from door to door.
A Specialty Gear Drives rebuild costs a fraction of sourcing a new Ball Mill unit, with equal or better reliability.
Our technicians hold the same certifications required by OEM service centers — ensuring every repair meets the highest industry standards.
We maintain blueprints for every Ball Mill model we've ever serviced — including discontinued and legacy units no longer supported by the manufacturer.
Ski lift down? Production line stopped? Our emergency team is available around the clock to accelerate your Ball Mill repair turnaround.
Call us and our repair coordinators — experienced former field technicians— can often diagnose your Ball Mill gearbox failure over the phone before the unit even ships.
Don’t let a failed pinion gearbox or girth gear shut down your milling operation. Call Specialty Gear Drives for a free quote, free pickup, and the fastest certified ball mill drive repair turnaround available.