Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Gearbox repair · Koellmann
Koellmann Gearbox Repair in Fontana
When a Koellmann gearbox starts making noise, running hot or shedding metal into its oil, the machine behind it is living on borrowed time. We rebuild Koellmann gearboxes working in German extruder and calender drives in rubber and plastics production at our Fontana shop at 14166 Whittram Ave — strip and measure every gear, shaft and bearing, manufacture what can no longer be bought, and return a box that runs to specification. Everything is done under one roof by the crew that quoted the job, with no work farmed out and no parts swapped on guesswork.
Gearbox repair · Koellmann
How Koellmann gearboxes wear — and what we do about it
The Koellmann units that reach our bench most often show calender-roll drive tooth pitting, extruder bearing wear from steady screw load, and oil degradation from process heat. At teardown we record backlash, tooth contact patterns, bearing condition, shaft wear and housing bore condition before anything is quoted — then we renew what the measurements condemn: bearings and seals as a set, shafts restored or made new, and gears cut in-house when the original is worn past saving or discontinued. Backlash and preload are set to specification and the finished box is run-checked before it leaves Fontana.
Brands we serviceKoellmannFalkFlenderSEW-EurodriveHansenNordSumitomo
Koellmann Gearbox Repair in Fontana · Fontana, CAOne Fontana shop for gears, machining and rebuilds
Gear cutting, machining, rebuilding and testing all happen at 14166 Whittram Ave, Fontana, CA 92335 — so a Koellmann gearbox job never waits on an outside machine shop. Regular hours are Monday to Friday, 6 AM to 5 PM, with 24-hour rush and emergency service every day of the year, 365 days. Talk to John Clark's team on (800) 821-3404 or (949) 400-2937, or write to [email protected], for a free quote.
- Koellmann gearbox teardown, inspection and full rebuild
- Replacement gears manufactured in-house, including discontinued gears
- Bearing, seal and shaft renewal set to specification
- Backlash and preload set and run-checked before release
- 24-hour rush and emergency gearbox service, 365 days
Our 8-step repair process
A clear path from the first call to a tested component or machine returned to work.
Inspection
Disassemble and evaluate the complete failure.
Photos & video
Document condition and findings for a clear repair conversation.
Repair quote
Define the recommended work and quote before proceeding.
Approval
Confirm scope, urgency and the practical path forward.
Manufacturing
Machine, weld, rebuild or reverse engineer required components.
Testing
Verify operation and workmanship before release.
Shipment
Return the completed component or equipment to service.
Frequently asked questions
Do you service Koellmann calender drives?
Yes — pitted gearing is measured and renewed or manufactured in-house, bearings and seals replaced as a set, and the drive run-checked under our test procedure before release.
What are the warning signs a gearbox needs attention?
New noise under load, rising operating temperature, metal in the oil, leaking seals and growing backlash are the usual warnings — catching them early is the difference between a bearing-and-seal renewal and a full gear replacement.
Do you offer rush gearbox repair?
Yes — 24-hour rush and emergency service runs every day of the year. Call (800) 821-3404 or (949) 400-2937.
Related services
Emergency breakdown? Call the 24-hour rush line.
(949) 400-2937Schedule service or open a repair order
Request a service call.
Include the make, model, symptoms, location, urgency and preferred service time. Your details open in a text to John so you can review them before sending.