PM planOfficial FreeMaint

Rotary screw air compressor preventive maintenance plan

Service plan for an oil-injected screw compressor, every 3 months or 2,000 running hours: air filter, condensate drains, coolers and belts each time, oil and oil filter every 2nd service, separator and safety valve every 4th.

10 tasksCompressed airVersion 1Updated

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What’s inside

Schedule

Every 3 months or every 2000 h, whichever comes first

  • The next date is counted from the last completion.
  • Work order window: 7 days
Estimated duration: 3 hPriority: Medium

Imported inactive and without equipment: assign it to your assets, set its start date (the first due date), check the intervals against the manufacturer’s manual, then switch it on.

Tasks at each service

  1. Stop, isolate and depressurise the compressor

    Stop the compressor from its controller, open and lock the electrical isolator, close the outlet valve and let the internal pressure vent completely before opening any panel.

    Action15 min

    Tools: Padlock and tag

    Risks: Stored air pressure and automatic restart: never open a circuit under pressure.

  2. Inspect and replace the air intake filter

    Check the filter element and the restriction indicator; replace the element if it is clogged, damaged or due.

    Action15 min

  3. Test the condensate drains

    Check that every automatic drain discharges, clean its strainer and empty the condensate separator according to local rules.

    Verification10 min

  4. Clean the oil cooler and the aftercooler

    Blow the cooler fins clean from the inside out with low-pressure air and check the cooling fan.

    Action20 min

    Risks: Wear eye protection when blowing out dust.

  5. Check the drive belts or coupling

    Check belt tension, wear and alignment, or the condition of the flexible coupling element on direct-drive units.

    Inspection10 min

  6. Replace the oil filter

    Fit a new oil filter, oiling its gasket with clean compressor oil, and tighten by hand as indicated on the filter.

    Action20 minonce every 2 services

  7. Change the compressor oil

    Drain the oil while it is still warm, refill with the oil grade specified by the manufacturer up to the correct level, and dispose of the used oil through an approved collector.

    Action40 minonce every 2 services

    Tools: Drain container sized for the full oil charge

    Risks: Hot oil: let the machine cool enough to be handled safely.

  8. Replace the air/oil separator element

    Replace the separator element and its gaskets, check the oil scavenge line and its restrictor.

    Action60 minonce every 4 services

  9. Check the safety valve

    Check that the safety valve is not blocked, painted or leaking, and that its test is up to date according to local pressure equipment rules.

    Verification10 minonce every 4 services

  10. Restart and record the operating values

    Remove the lock, restart, check for oil and air leaks, then record the loading and unloading pressures, the discharge temperature and the running hours.

    Measurement20 min

Parts (indicative)

  • Air intake filter element × 1
  • Oil filter × 1
  • Air/oil separator element × 1
  • Compressor oil, full charge × 1

Tools (indicative)

  • Oil filter wrench
  • Infrared thermometer — For the discharge temperature check
  • Low-pressure blow gun — For cleaning the coolers

Indicative list: on import it is written into the plan’s description, to link to your own inventory.

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Licence

Official FreeMaint template, free to use and adapt inside your FreeMaint workspace. An adaptation may be shared in the library under CC BY 4.0; its page then credits this template.

Templates are general guidance. They do not replace the manufacturer’s instructions, your site procedures or applicable regulations.

Equipment: Compressed air

Industries: Manufacturing, Food and beverage, Energy and utilities

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