Guide · Yaskawa · Sigma-7 · Sigma-V · Updated November 2026
Yaskawa servo scheduled maintenance: parts to replace and when
Yaskawa gives standard replacement periods for the SERVOPACK cooling fan, relays, battery and electrolytic or smoothing capacitor in its Sigma-7 and Sigma-V manuals. This page lists them by interval so replacements can be planned before a failure stops the machine. Star Automations is an independent repairer, not a Yaskawa authorised service provider.
Parts to replace, by interval
| Interval | Part | What the manual says | Replace |
|---|---|---|---|
| Every year | Inspection of the SERVOPACK | Check for dust, dirt and oil on the surface and for loose terminal block and connector screws. Clean with compressed air or a cloth and tighten loose parts. | None unless a fault is found |
| 4 to 5 years | Cooling fan (Sigma-7 SERVOPACK) | Standard replacement period in the Sigma-7 SGD7S product manual. The periods assume an annual average surrounding air temperature of 30°C, a load factor of 80% at most and an operation rate of 20 hours a day at most. Hotter or heavier duty shortens them. | Cooling fan |
| 3 years without power supplied | Encoder backup battery (Sigma-7) | The Sigma-7 manual gives 3 years for the battery without power supplied to the SERVOPACK. Keep a record of the absolute encoder position procedure before changing it. | Battery |
| 100,000 power-ON operations | Relays (Sigma-7) | Standard replacement period for the relays in the Sigma-7 manual, with power switched on once an hour. | Relays |
| 10 years (Sigma-7) | Electrolytic capacitor (Sigma-7) | Standard replacement period in the Sigma-7 SGD7S manual. The periods assume an annual average surrounding air temperature of 30°C, a load factor of 80% at most and an operation rate of 20 hours a day at most. Hotter or heavier duty shortens them. | Electrolytic capacitor |
| 7 to 8 years (Sigma-V) | Smoothing capacitor (Sigma-V SGDV) | Standard replacement period for the aluminium electrolytic smoothing capacitor in the SGDV user manual. Replace sooner if the conditions above are not met. | Smoothing capacitor |
| Condition-based | Servo motor bearings | We could not verify a fixed hour figure for motor bearings in the SERVOPACK manuals. Replace on noise, vibration or heat, or when the motor is repaired. | Motor bearings when worn |
Sources: Yaskawa Sigma-7 SGD7S Product Manual, Inspections and Part Replacement (section 14.1); Yaskawa SGDV User Manual, Inspection and Maintenance (section 1.7). Check the manual for your exact SERVOPACK model.
How to see a part wearing out
Service life prediction
Sigma-7 SERVOPACKs have a service life prediction function. Use it alongside the table instead of waiting for an alarm.
Battery
A low encoder battery loses the absolute position. Change it on schedule and keep a record of the home position procedure.
Heat
Hot panels shorten fan and capacitor life. Keep vents clean and check the fan at every yearly inspection.
Motor
Listen for bearing noise and check vibration and temperature at each inspection.
Plan your own replacements
Enter the commissioning date in the servo maintenance planner to see the replacement window for each part, and send the list to Star Automations on WhatsApp.
How Star Automations helps
Send us the SERVOPACK or servo motor with the label details. As part of repair or refurbishment we can replace the cooling fan, battery, relays and capacitors, and replace worn motor bearings, and tell you which other parts are near the end of their life. See Yaskawa servo drive repair. Also read the Mitsubishi scheduled maintenance page for the same plan on MELSERVO.
Questions
How often should a Yaskawa Sigma-7 SERVOPACK cooling fan be replaced?
The SGD7S product manual gives a standard replacement period of 4 to 5 years for the cooling fan, under an annual average ambient of 30°C, load factor up to 80% and up to 20 hours a day of operation.
What is the life of the electrolytic capacitor?
The Sigma-7 manual gives 10 years. The Sigma-V SGDV manual gives 7 to 8 years for the smoothing capacitor. Both assume 30°C annual average ambient.
When should the absolute encoder battery be changed?
The Sigma-7 manual gives 3 years without power supplied to the SERVOPACK as the standard replacement period for the battery.
Does Yaskawa have a service life prediction function?
Yes. The SGD7S manual says to use the SERVOPACK service life prediction function or the replacement table, and to contact Yaskawa if a part is close to the end of its period.
How often should servo motor bearings be changed?
There is no fixed figure we can verify from the SERVOPACK manuals. Bearings are replaced on condition, such as noise, vibration or heat, or during motor repair.
Can Star Automations help with these replacements?
Yes, through our repair service. Send the SERVOPACK or servo motor with its label details. We are an independent repairer and not a Yaskawa authorised service provider.
About the author
S. Suresh, Founder and CEO of Star Automations. More than 25 years in industrial electronics repair, with servo motor and drive repair as the main focus since 1998. Last updated: .
Send the SERVOPACK label and the alarm number.
WhatsApp a photo of the label to +91 97866 22233, or email info@starautomations.com.