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Free generator maintenance checklist: Ready when the power goes.

A printable generator maintenance checklist for diesel and gas standby sets. It covers the engine, the batteries and charger, and a test run with the transfer switch. Use it for weekly checks or monthly service visits, then print it or save a PDF.

1. Pick a template
Suggested: weekly or monthly
2. Mark each check
Engine
  1. Check engine oil level
  2. Check coolant level and look for leaks
  3. Check fuel level and look for fuel leaks
  4. Inspect belts and hoses
  5. Check the air filter restriction indicator
Electrical
  1. Check battery voltage and clean the terminals
  2. Check the battery charger is working
  3. Inspect wiring and control panel for alarms
Test run
  1. Run the generator and record running hours
  2. Check voltage and frequency on the panel
  3. Listen for unusual noise or vibration
  4. Check the transfer switch is set to auto
0 of 12 checks done0 pass · 0 fail · 0 N/A

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What it covers

The standby generator checks.

How often: weekly or monthly

Engine

  • Check engine oil level
  • Check coolant level and look for leaks
  • Check fuel level and look for fuel leaks
  • Inspect belts and hoses
  • Check the air filter restriction indicator

Electrical

  • Check battery voltage and clean the terminals
  • Check the battery charger is working
  • Inspect wiring and control panel for alarms

Test run

  • Run the generator and record running hours
  • Check voltage and frequency on the panel
  • Listen for unusual noise or vibration
  • Check the transfer switch is set to auto

These are common checks to start from. Your machine’s manual and the safety rules for your site come first, so add or change checks to match them.

From the field

Tips for a better check.

  • Write down the running hours at every visit. Oil and filter changes usually go by hours, not by date.
  • Batteries cause many failed starts. Check the voltage and the charger every visit, not just once a year.
  • Leave the transfer switch on auto after the test run, and tick it off on the sheet.

Want this check to come up on schedule? See how preventive maintenance plans work in Catalyces.

More free checklists

Questions

Standby generator checklist questions.

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Email hello@catalyces.com

A quick weekly check and a short test run, plus a fuller service every month or quarter, is common. Oil, filters and coolant are usually changed by running hours or once a year, whichever comes first. Follow the manufacturer’s schedule and any rules for your site.