A rotary screw air compressor is built to run for years, but only if it receives consistent maintenance. Most breakdowns come from neglected filters, oil and cooling rather than major component failure. A simple schedule prevents most unscheduled downtime.
Daily checks
- Drain condensate from the receiver tank and filters
- Check discharge temperature and pressure against normal values
- Listen for unusual noise or vibration
- Inspect for oil and air leaks
Monthly checks
- Inspect and clean the air intake filter
- Check oil level and top up with the correct grade
- Tighten electrical and pipe connections
- Verify safety valve and pressure switch operation
Annual service
- Replace oil, oil filter, air filter and separator
- Change belts and check alignment
- Service the inlet valve and minimum pressure valve
- Inspect the airend and motor bearings
- Clean coolers and test the dryer performance
Keep a written log of hours, pressures, temperatures and parts changed. The log reveals slow degradation such as rising discharge temperature, which is often the first sign of a blocked cooler or worn airend.