Free electric motor annual service checklist
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A comprehensive annual service procedure for industrial AC induction motors. Includes all quarterly service tasks plus insulation resistance testing (megger), polarisation index test, surge comparison test, vibration spectrum analysis (FFT), bearing replacement assessment, winding cleaning, brush gear and slip ring inspection, load performance check, thermal imaging survey, cable termination inspection and maintenance log update. The motor must be isolated and locked out. This page explains what the service involves, how to perform it, and offers a free PDF-ready form you can download straight away.
Last updated: 2026-03-26 · MapTrack
Commercial Director
How to use: Complete the quarterly service first, then work through these additional annual items. Ensure the motor is isolated and locked out before starting insulation testing and winding work. Record all test results for trend comparison. Sign off and update the maintenance log.
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- ✓ Includes parts list, equipment list and sign-off
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See the first part of the service procedure below. Enter your email above to download the full electric motor annual service procedure (PDF-ready).
What is an electric motor annual service?
An annual service is the comprehensive tier of scheduled preventive maintenance for an industrial AC induction motor. It includes all quarterly service tasks (bearing temperatures, vibration, running amps, lubrication, coupling check, VFD inspection) plus additional diagnostic testing and component inspection that requires the motor to be isolated and locked out. The annual service adds insulation resistance testing to detect winding degradation, vibration spectrum analysis (FFT) to identify specific fault frequencies, thermal imaging to find hotspots under load, bearing replacement assessment, winding cleaning and contamination inspection, and cable termination inspection. The annual service builds a comprehensive condition record that informs replacement planning and budgeting.
Benefits of annual electric motor servicing
- Insulation health monitoring: annual megger testing and polarisation index trending detects winding insulation degradation years before failure, allowing planned rewinding or replacement.
- Predictive maintenance data: FFT vibration analysis identifies specific fault types (bearing defects, imbalance, misalignment, electrical faults) enabling targeted corrective action.
- Thermal fault detection: thermal imaging under load reveals hotspots at connections, windings and bearings that are invisible to visual inspection.
- Reduced catastrophic failure: combining insulation testing, vibration analysis and thermal imaging provides a comprehensive view of motor health that catches problems at multiple stages.
- Compliance and insurance: documented annual testing records with megger readings, vibration data and thermal images support WHS, insurance and audit requirements.
- Capital planning: trending annual test results informs motor replacement budgets and spare stock decisions.
Benefits of digitising forms in MapTrack
When you move from paper or static PDFs to digital forms in MapTrack, you get:
- Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
- Automatically get alerts when faults are identified.
- Link every form digitally as a PDF to the relevant asset, location or person.
- Receive a digital PDF copy with every submission to your email.
- Ability to share forms digitally.
- Build conditional logic (show or hide questions based on answers).
- Take pictures or attach photos. Not possible with a paper-based form.
- Electronic signatures.
- Edit forms later without reprinting.
- Restrict permissions (who can view, complete or approve).
- Build forms with AI (describe what you need and MapTrack suggests the form).
Book a demo to see digital service procedures and condition-based scheduling in MapTrack.
Service actions included in the annual procedure
This service procedure covers 11 additional service actions across 6 system areas (in addition to all quarterly tasks):
- Insulation testing: insulation resistance test (megger), polarisation index test (motors over 200 kW), surge comparison test (if equipment available).
- Vibration analysis: vibration spectrum analysis (FFT) to identify bearing, imbalance and misalignment frequencies.
- Bearings: replace bearings if due per schedule or condition monitoring indicates.
- Windings: clean motor windings with compressed air, check for contamination. Inspect brush gear and slip rings (wound rotor motors).
- Performance: check nameplate data against actual running load. Thermal imaging survey of connections, windings and bearings under load.
- Connections: inspect cable terminations and tighten. Update motor maintenance log.
Parts and equipment
Have the following parts and equipment ready before starting the annual service (in addition to all quarterly items):
- Bearings (if replacing, per motor specification)
- Insulation resistance tester (megger)
- Vibration analyser (FFT capable)
- Thermal imaging camera
- Surge comparison tester (if available)
- Compressed air supply
- Lock-out/tag-out equipment
Check the motor nameplate and service manual for the correct bearing part numbers before ordering replacements.
How to perform an electric motor annual service
- Complete the quarterly service procedure first (bearing temps, vibration, running amps, lubrication, coupling, VFD check). See the quarterly service template.
- While the motor is running under load, perform a thermal imaging survey of connections, windings and bearings. Check nameplate data against actual running load (% of rated).
- Isolate the motor and apply lock-out/tag-out. Allow the motor to cool if required.
- Perform insulation resistance test (megger). Record the reading in megaohms and compare to the minimum acceptable value and previous readings.
- For motors over 200 kW, perform a polarisation index test (10 min / 1 min ratio). Record the result.
- Perform surge comparison test if equipment is available. This detects turn-to-turn insulation faults not found by megger testing.
- Perform vibration spectrum analysis (FFT) to identify bearing defect, imbalance, misalignment and electrical fault frequencies.
- Assess bearings for replacement based on the service schedule and condition monitoring data (vibration, temperature trends). Replace if due.
- Clean motor windings with compressed air. Check for contamination (oil, dust, moisture). Inspect brush gear and slip rings if wound rotor motor.
- Inspect cable terminations and tighten. Update the motor maintenance log with all test results. Set the next service due date and sign off.
In MapTrack, you can schedule services by calendar date, complete service procedures on mobile and link every record to the motor. Book a demo to see how.
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Back to download formElectric motor service interval hierarchy
Electric motor maintenance follows a tiered schedule where the annual service includes all tasks from the quarterly service. This is called carry-forward or cumulative servicing.
Bearing temps, vibration, running amps, lubrication, coupling, VFD check. Estimated 1-1.5 hours.
Annual service (you are here)
All quarterly tasks plus insulation resistance test, vibration spectrum analysis (FFT), bearing replacement (if due), winding cleaning, thermal imaging and cable termination inspection. Estimated 3-5 hours.
In MapTrack, you can configure service schedules by calendar date and receive automatic alerts when each interval is due.
Frequently asked questions
- What is included in an electric motor annual service?
- An annual electric motor service includes all quarterly service tasks (bearing temps, vibration, running amps, lubrication, coupling, VFD check) plus insulation resistance testing (megger), polarisation index test (for motors over 200 kW), surge comparison test (if equipment available), vibration spectrum analysis (FFT to identify bearing, imbalance and misalignment frequencies), bearing replacement (if due per schedule or condition monitoring), winding cleaning and contamination inspection, brush gear and slip ring inspection (wound rotor motors), nameplate versus actual load check, thermal imaging survey under load, cable termination inspection and tightening, and maintenance log update. It takes approximately 3 to 5 hours. The motor must be isolated and locked out.
- What is an insulation resistance test on an electric motor?
- An insulation resistance test (megger test) measures the resistance between the motor windings and earth in megaohms. It detects insulation breakdown caused by moisture, contamination, heat damage or ageing. The test is performed with a megger (insulation resistance tester) at a voltage appropriate for the motor rating (typically 500V or 1000V DC). A reading below the minimum acceptable value (generally 1 megaohm per kV of rated voltage plus 1 megaohm) indicates insulation degradation. Trending the readings over annual services detects gradual deterioration before failure occurs.
- What is a polarisation index test?
- A polarisation index (PI) test is an extended insulation resistance test that compares the 10-minute reading to the 1-minute reading. The ratio indicates the condition of the insulation. A PI ratio above 2.0 is generally acceptable for Class B, F and H insulation. A ratio below 1.5 suggests moisture or contamination. The PI test is typically performed on larger motors (above 200 kW) as part of the annual service. It provides more diagnostic information than a single megger reading.
- Is the template free to use without MapTrack?
- Yes. Download and use the electric motor annual service procedure for free. Open the file and use your browser's Print, then Save as PDF. No MapTrack account required. If you later want digital service procedures linked to each motor with scheduling, condition monitoring and alerts, we would be happy to show you MapTrack.
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Register every motor in MapTrack. Set up quarterly and annual service schedules, complete procedures on mobile, track condition data over time, and get automatic alerts when the next service is due.