Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Gear shop · Sumitomo Drive Technologies
Sumitomo Gearbox Repair in Fontana
Sumitomo speed reducers — the Cyclo drive with its eccentric discs, Paramax parallel and right-angle reducers, and the heavy industrial gearboxes Sumitomo absorbed from Hansen — run conveyors, mixers, water treatment plants and material handling that cannot stop for a factory lead time. LA Trucks and Tractors rebuilds Sumitomo gearboxes at our Fontana shop at 14166 Whittram Ave: units torn down and measured, worn components renewed or reverse-engineered, clearances set back to specification and the rebuilt drive tested before it returns to service.
Gear shop · Sumitomo Drive Technologies
Cyclo drives and parallel reducers, judged by their wear pattern
Cyclo drives fail differently from conventional gearboxes: disc and pin wear, eccentric bearing fatigue and output-pin fretting each leave their own signature. Paramax and conventional reducers tell the more familiar story of tooth wear, backlash growth and bearing fits. We document what the teardown actually shows and quote from those findings — renewing discs, pins, bearings and seals where they are worn, and manufacturing replacement gearing in-house where originals are discontinued, so the drive keeps its housing, ratio and footprint.
Brands we serviceSumitomoHansenFalkFlenderSEW-EurodriveNordPhiladelphia Gear
Sumitomo Gearbox Repair in Fontana · Fontana, CAA proven reducer deserves a proven rebuild, not a substitute
Regular hours are Monday-Friday 6 AM-5 PM; the rush line runs 24 hours a day, every day of the year, because a plant-down reducer is an emergency by definition. Pick-up and delivery are free, quotes are free and written from teardown measurements, and you talk directly with John Clark — one shop accountable for the machining, the rebuild and the test.
- Sumitomo Cyclo drive rebuilding and renewal
- Paramax and industrial reducer rebuilding
- Disc, pin, bearing and seal renewal from teardown findings
- Reverse-engineered replacement gearing manufactured in-house
- Rush rebuilds for plant-down emergencies
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
Can you rebuild a Cyclo drive, not just a conventional gearbox?
Yes — Cyclo drives are a distinct mechanism and we rebuild them as such: discs, pins, eccentric bearings and output components inspected and renewed from teardown measurements.
My Sumitomo reducer is an older Hansen-design unit. Can you still repair it?
Yes. Hansen industrial gearboxes are a standing specialty here, and units built on that lineage are rebuilt on the same benches with gearing manufactured in-house when originals are discontinued.
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.