Steel Mill Gearbox Repair & Gear Manufacturing
Heavy mill drives rebuilt to hold up under heat, shock loads and around-the-clock production — with emergency pickup and delivery to our Rialto, CA shop.
Gearbox & Pump Repair for Steel Mills
Rebuilt at our Rialto, CA shop.
Steel mill gearboxes take the worst of it: shock loads, high temperatures, scale, water and dust, and long runs with little planned maintenance. When a mill drive fails, the line stops, so the repair has to be done right the first time. American Gearbox Repair rebuilds steel mill gearboxes and manufactures replacement gears at our Rialto, California shop, serving mills across California and nationwide by pickup, delivery and shipped-in repair.
We work on the drives that keep a mill moving — from roughing and finishing stands to coilers, conveyors and cranes. Every unit is inspected and quoted before work starts, and rebuilt units carry our 24-month warranty.
Equipment We Repair in Steel Mills
- Mill stand gearboxes — parallel-shaft and right-angle drives for roughing, intermediate and finishing stands, rebuilt with new bearings and seals.
- Coiler and uncoiler drives — gearboxes handling heavy coil loads and repeated reversing, checked for tooth wear and bearing damage.
- Roller table and conveyor drives — drives exposed to scale, heat and water, with attention to sealing and lubrication.
- Crane and hoist gearboxes — travel, hoist and trolley drives, inspected for gear, brake and bearing condition.
- Furnace and charging equipment drives — drives working in high-heat areas, rebuilt for the operating temperature.
- Pumps and hydraulic cylinders — process and cooling-water pumps and mill cylinders repaired alongside gearbox work.
Common Failures We See
- Gear tooth wear, pitting and breakage — from shock loads, misalignment and oil contamination.
- Bearing failure and shaft wear — from heat, heavy radial loads and water or scale getting past seals.
- Housing cracks and fretting — from vibration and repeated load reversals on older stands.
- Lubrication breakdown — oil contamination, loss of viscosity and failed coolers that accelerate wear throughout the drive.
- Seal and breather failure — letting scale, water and dust into the gearbox and shortening the life of every component inside.
Repair & Rebuilding Services
- Complete gearbox rebuilding — disassembly, cleaning, inspection and measurement, with worn gears, shafts, bearings and seals replaced.
- Custom gear manufacturing — replacement spur, helical, bevel and worm gears cut and machined when the original gear is worn, broken or no longer available.
- Industrial pump repair — centrifugal and positive-displacement pumps for cooling water, descaling and process service.
- Hydraulic cylinder repair — resealing, re-rodding and re-honing for mill cylinders, tested before return.
- Failure analysis and reporting — a clear explanation of what failed and why, so it can be prevented next time.
Emergency & Rush Service
When a line is down, call (714) 204-5167 — emergency service is available 24/7. We arrange emergency pickup and delivery to our Rialto shop, prioritise inspection, and, on qualifying jobs, complete rush repairs in 24–72 hours. Rush timing depends on unit condition, parts availability and job complexity, so we confirm a realistic schedule after inspection. See our emergency repair page.
How a Repair Works
Repairs are done at our shop in Rialto, California — we do not repair equipment on your site. Ship your unit to us, or arrange emergency pickup and delivery. We inspect it, confirm the failure and parts needed, and quote the repair before work starts. Turnaround depends on equipment condition, parts required, job complexity and availability. Rebuilt units are tested where applicable and covered by our 24-month warranty. Call (714) 204-5167 or request a quote with the brand, model and problem.
Get Started
If a mill drive is noisy, hot, leaking or vibrating, do not run it until it seizes — call us with the brand, model and symptoms and we will advise whether to ship it in now or plan around your next outage. Call (714) 204-5167 or request a quote.
Need a repair quoted?
Call (714) 204-5167 or send a quote request — we will confirm what to send in and how pickup works.