Koyo spindle and motor spindle repair
Brochexpress is an independent workshop specializing in the repair, maintenance and diagnostics of Koyo spindles and motor spindles. Koyo is the centerless grinder brand of the Japanese JTEKT group.
Koyo, centerless grinders from the JTEKT group
TLDR: Koyo is the grinder brand of Koyo Machine Industries, a JTEKT group company (Japan) known for its centerless grinders. In the United States, Koyo Machinery USA was merged into JTEKT Machinery Americas in April 2024.
The JTEKT group also owns the Toyoda machine tool brand. Koyo machines are found today on the used market under the names Koyo, JTEKT or Koyo Machine. Exact models and series are to be confirmed from your machine's nameplate.
Two spindles that make a centerless grinder accurate
TLDR: On a Koyo centerless grinder, the part is guided between the grinding wheel, the regulating wheel and a work rest: accuracy depends on the stability of both spindles.
With no centres or chuck to hold the part, a centerless grinder relies on its wheels alone for cylindricity. Play or imbalance on the Koyo grinding wheel spindle, or on the regulating wheel spindle, shows up immediately on the part: cylindricity errors, chatter, degraded surface finish.
Koyo spindles and motor spindles covered (non-exhaustive list)
- Grinding wheel spindles on centerless grinders
- Regulating wheel spindles
- Wheel spindles on other Koyo grinders (cylindrical, surface)
- Spindles on older Koyo or JTEKT-branded machines
Interfaces and specifications
Power ratings, speeds, wheel dimensions and bearing types vary by model and year: to be confirmed in our quote, from your machine's nameplate.
Our expertise on your Koyo spindles and motor spindles
TLDR: Brochexpress covers the entire life cycle of your Koyo spindles and motor spindles, with the same rigour as for the other brands in our portfolio.
On-site service
- Diagnostics and repair directly on your machine, to limit production downtime
Full diagnostics
- Inspection of play, balancing, bearing condition, sealing and lubrication, with a detailed technical report
Preventive and corrective maintenance
- Maintenance programme matched to your production rate, with corrective work in case of failure
Overhaul and refurbishment
- Grinding, bearing replacement, seal refurbishment and run-in test in our workshop, restoring original tolerances
Why choose Brochexpress for your Koyo spindles
- Independent workshop, with no financial ties to the manufacturers, ensuring an objective diagnosis
- Experience with centerless grinding spindles, where a spindle defect shows on the part immediately (cylindricity, chatter)
- Ability to handle older, often poorly documented machines
- Two service locations: Beaurepaire (France) and Lussery-Villars (Switzerland)
Turnaround and warranty
- On-site service within 48 hours
- Workshop repair: around 20 working days depending on parts availability
- 12-month warranty on all our repairs
Frequently asked questions
Do you repair the spindles of Koyo centerless grinders?
Yes, we repair both the Koyo grinding wheel spindle and the regulating wheel spindle.
Are Koyo and JTEKT the same thing?
Koyo is a JTEKT group brand. We work on machines bearing either name.
Do you work on older models?
Yes, we work on machines of any age.
What is the average turnaround for a complete overhaul?
Allow around 20 working days in our workshop, depending on the condition of the spindle and parts availability (bearings, seals, specific components).
Do you offer a preventive maintenance contract for a fleet of Koyo machines?
Yes, we set up preventive maintenance programmes matched to your production rate and the criticality of your machines.
Are you an official Koyo partner?
No. Brochexpress is an independent repair and maintenance workshop. We are neither affiliated with, nor a partner of, nor an authorised distributor of Koyo Machine Industries or JTEKT. Our business covers independent maintenance of industrial equipment, permitted under the principle of referential trademark use (EU Trademark Directive 2015/2436 / French Intellectual Property Code, art. L.713-6).
A reliable partner for your industrial performance
Whether you need emergency on-site service, a complete workshop overhaul or a preventive maintenance programme, Brochexpress puts its expertise at the service of your production. As an independent workshop, we work on your Koyo spindles and motor spindles.
Our teams are available from our Beaurepaire (France) and Lussery-Villars (Switzerland) sites for a needs assessment, a diagnosis or a tailored quote.
Request a quoteRelated services
KOYO® is a registered trademark of its owner. Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of Koyo Machine Industries or JTEKT. Our business covers independent repair and maintenance of industrial equipment, permitted under the principle of referential trademark use (EU Trademark Directive 2015/2436 / French Intellectual Property Code, art. L.713-6).