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If your Mitsubishi servo motor is making strange noises or vibrating excessively, It’s likely necessary to replace motor bearings to restore optimal motor performance and prevent further internal damage.
In this article, we’ll take you step-by-step through an actual case in which we installed new bearings in a Mitsubishi servo motor and replaced its bearings ourselves. Don’t miss our step-by-step video that documents this process!
Tip: If the motor sounds like it’s “growling” or feels shaky during normal operation, chances are the bearings are failing.
A customer sent us a Mitsubishi HF104S servo motor reporting noise and performance issues. Our technician confirmed that the motor bearings had worn out after initial testing and disassembly.
Before we replace motor bearings, our team performs insulation resistance tests and shaft rotation checks to verify the internal status.
After reassembly, we powered up the motor on our test platform:
The motor passed all our standard tests and was sent back to the customer with a warranty.
We specialize in repairing Mitsubishi, FANUC, and Siemens servo systems. Our repair process includes:
Replacing worn-out bearings in a Mitsubishi servo motor can significantly reduce downtime and save costs compared to full motor replacement. If you’re experiencing symptoms like unusual noise or vibration, don’t wait—let us help you replace motor bearings the right way.
Contact us today to book a free evaluation.
Browse more repair cases here
Watch more behind-the-scenes repair videos on our YouTube!
Common signs include unusual noise (grinding, humming), increased vibration, overheating, or loose shaft movement. If you notice these symptoms, it’s recommended to inspect the bearings immediately to prevent further motor damage.
Technically possible, but not recommended unless you have professional tools and experience. Improper bearing removal or reassembly can damage the rotor or encoder, leading to more costly repairs. It’s safer to let experienced technicians handle it.
For professionals, it usually takes 2–4 hours, including disassembly, cleaning, bearing installation, and testing. If additional damage is found (e.g., shaft wear), it may take longer.
It depends on the motor model, but most Mitsubishi servo motors use high-precision deep groove ball bearings. We always match OEM specs to ensure proper fit and performance.
Yes. All our bearing replacement services include a standard 3-month warranty. If you have issues during the warranty period, just contact us for support or a free recheck.
Yes, excessive vibration or internal damage caused by failed bearings can trigger servo alarms, encoder errors, or even overcurrent/overload faults on your Mitsubishi drive.
The cost depends on the motor size and model. Feel free to contact us for a quote!
How we process your repair requirements
Get in touch with us and provide as much detail as possible about the issue you are experiencing.
Our professional repair team will help assess the severity of the problem and the possibility of repair.
The customer sends or delivers the servo drive to our company. We register it in our system and prepare it for further inspection.
Our engineers diagnose the fault points of the servo drive and provide a detailed inspection report, including the final repair cost and estimated repair time.
We provide the repair quote to the customer and wait for their confirmation. If the customer agrees to the quote, we proceed with the repair.
Upon customer approval, we carry out the necessary repairs. After repairs are completed, we perform tests with the motor and conduct aging tests to ensure the servo drive operates reliably under various conditions. Once the testing is successful, we register the drive for delivery.
The customer completes the payment, and we deliver the repaired servo drive to the customer.
We provide attentive follow-up service to ensure customer satisfaction and address any further needs.
