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24-Hour Rush Repair
Gearbox repair · De Ran
De Ran Gearbox Repair in Fontana
When a De Ran gearbox starts making noise, running hot or shedding metal into its oil, the machine behind it is living on borrowed time. We rebuild De Ran gearboxes working in heavy parallel-shaft industrial drives in aggregate, cement and bulk-material plants at our Fontana shop at 14166 Whittram Ave — complete teardown, gear-by-gear measurement, bearing and seal renewal, and in-house gear manufacturing when a gear is worn, chipped or no longer supplied. The finished box is set to specification for preload and backlash and run-checked before it leaves, not simply put back together and hoped for.
Gearbox repair · De Ran
How De Ran gearboxes wear — and what we do about it
The De Ran units that reach our bench most often show tooth pitting from sustained high-torque duty, bearing brinelling under shock loads from crushers and conveyors, and case bores worn oval by years of vibration. At teardown we record backlash, tooth contact patterns, bearing condition, shaft wear and housing bore condition before anything is cleaned, so the quote is built on the box you actually have rather than a catalogue guess. Worn gears can be rebuilt up in some cases or replaced with gears we cut ourselves — ring gears, helical, bevel, herringbone and worm work is all done in this shop — which keeps an older or discontinued De Ran unit in service instead of scrapped. Housings are checked for bore wear and misalignment, seals and bearings are renewed as a set, shafts are repaired or manufactured where scoring demands it, and the rebuilt gearbox is assembled, set up and run-checked before release.
Brands we serviceDe RanFalkFlenderSEW-EurodriveHansenNordSumitomo
De Ran 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 De Ran 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 on your gearbox.
- De Ran 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
My De Ran gearbox is an older unit — can parts still be made?
In most cases, yes. We measure the worn gears and shafts at teardown and manufacture replacements in-house, then rebuild the rest of the box around them with new bearings and seals.
What are the warning signs a gearbox needs attention?
New whine or rumble, rising operating temperature, metal particles in the oil, backlash you can feel at the shaft, vibration under load and leaking seals. Caught early, most boxes need bearings, seals and setup rather than new gears.
Do you handle rush gearbox jobs?
Yes — emergency and rush repair runs 24 hours a day, 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.