Guide · Servo motor · Updated October 2026
Servo motor maintenance checklist (India)
Servo motor maintenance is mostly regular looking, listening and cleaning: check the cable and connector, temperature, noise, cooling and oil, and the drive alarm history. Most failures give early warning. Catching them early saves repair cost and downtime.
By Suresh Sankaran, founder of Star Automations, servo motor repair since 1998.
Why servo motor maintenance matters
A servo motor rarely fails without warning. Heat, noise, small alarms and loose cables usually appear first. A short, regular check finds these early, when the repair is small, instead of after the motor and the drive are damaged and the machine is stopped.
This checklist is general guidance. Always follow the motor and drive manual of the manufacturer for your model, and switch off and lock out power before touching a motor.
The checklist: what to check and when
| When | What to check | What it tells you |
|---|---|---|
| Every shift or daily | Listen for new noise. Check for oil, coolant or dust. Note any drive alarm or warning | Early bearing wear, seal leakage and repeated alarms |
| Weekly | Surface temperature (by touch only if safe, or a thermometer). Clean dust from cooling fins and fan | Overload or poor cooling |
| Monthly | Cable and connector: tight, undamaged, no oil. Coupling and mounting bolts tight. Cable bend points | Loose connections, cable fatigue and misalignment |
| Every few months | Read and record the drive alarm and load history. Compare current and temperature with the earlier readings | Slow changes that show wear before failure |
| At overhaul or when a fault appears | Bearings, shaft and seals, encoder or resolver, brake, winding insulation, alignment and run test | Everything inside the motor, done with proper equipment |
Warning signs: send the motor before it fails
- The motor runs hotter than before
- New grinding, rumbling or buzzing noise or vibration
- Repeated encoder, overload or overcurrent alarms
- Loss of position or jerky motion
- Oil or coolant at the shaft
- The brake slips or does not release
- A burnt smell or discoloured cable or connector
Do and do not
Do keep the motor clean and cool, protect the cable from bending and oil, keep a record of alarms, and keep a tested spare for critical machines.
Do not add grease to sealed bearings unless the manual says so, pressure-wash a motor, connect it directly to the mains, run it repeatedly after an alarm, or open it to "check" the encoder. Opening a motor can move the encoder alignment, and then the motor may not run even when everything looks fine. See why a motor does not run after a bearing change.
When to send the motor to Star Automations
Send the nameplate photo and the alarm code on WhatsApp. We confirm whether the motor is repairable before you courier it. Every motor is aligned and run on our Universal Server Run Test System before delivery. See also the AC servo motor guide, the servo motor repair FAQ and servo motor repair in India.
Questions
How often should servo motor maintenance be done?
There is no single interval. It depends on duty, heat, dust, coolant and the manufacturer's manual. A practical routine is a quick look and listen at regular intervals, a closer check of cables, connectors and cooling every few months, and a bearing and encoder check at overhaul or when a fault appears.
What should be checked on a servo motor during maintenance?
The cable and connector, the mounting and coupling, the surface temperature, noise and vibration, oil or coolant near the shaft seal, dust on the cooling fins, the brake, and the alarm history on the drive.
Do servo motor bearings need greasing?
Most servo motors have sealed bearings that are not greased by the user. Do not add grease unless the manual says so. Noise or roughness means the bearing may need replacement by a repairer.
How can I stop a servo motor from overheating?
Keep the motor and drive cool and clean, avoid running above the rated duty, check the ambient temperature and airflow, and make sure the load and settings suit the motor. Repeated overheating needs a proper test.
Why do servo motor cables fail and how can I prevent it?
Cables that move with the machine bend repeatedly and the cores break, or connectors loosen from vibration. Use proper flexible servo cables, keep a bend radius, secure the connector and check it during maintenance.
Should I keep a spare servo motor?
For critical machines, yes, if it is the same model and has been tested. A spare reduces downtime. A tested, repaired motor or an exchange unit can serve as the spare.
Can I open a servo motor myself for maintenance?
We advise against it. Opening the motor can disturb the encoder alignment and damage seals, and the motor may not run properly afterwards. Send it to a repairer with the right alignment and test equipment.
What are the warning signs that a servo motor needs repair soon?
Rising temperature, new noise or vibration, repeated encoder or overload alarms, loss of position, oil leakage, brake problems and a burnt smell. Early repair is cheaper than waiting for a complete failure.
Does Star Automations offer servo motor service across India?
Yes. You can courier the motor from anywhere in India. We confirm repairability from the nameplate and alarm code, repair it, align the encoder and run-test every motor on our Universal Server Run Test System before delivery.
Send the nameplate. We confirm repairability before you courier.
WhatsApp a nameplate photo and the alarm code to +91 97866 22233, or email info@starautomations.com.
Brand names identify the units we repair. Star Automations is an independent multi-brand repair company and is not an OEM service centre.