Lewis Systems & Service Co., Inc. not only sells new and used air compressors but a good part of our business is based around air compressor repair and servicing. Below is a list of some common air compressor repairs that we address in the field. This is not a troubleshooting guide or instructions on how to do repairs, however if your unit is serviced on a regular basis, a lot of these problems can be prevented.
Reciprocating Compressors:
- Rings – As the piston rings wear out, excessive oil consumption will rise.
- Valves – Carbon deposits can build up on the valves causing the compressor to take longer to build up pressure. They usually need regular cleaning or replacing if damaged.
- Controls – Defective pressure switch can cause starting problems as well as a faulty check valve. Problems with the pilot valve can cause the compressor not to unload properly.
- Belts can be too tight or too loose, also the pulley could be out of alignment causing excessive wear on the belts.
- Air intake filters should be inspected and changed on a regular basis. Dirty air filters can cause long pump up times and overheating.
- Routine Maintenance Items: Changing the air filter and oil on a regular basis will prevent many problems. It will also extend the life of valves and rings.
Rotary Screw Compressors:
- Controls / Check Valves: The majority of problems that arise on rotary screw compressors are related to the controls and sensors. A faulty pressure transducer or a sticky thermal valve element can shut your compressor down very quickly. It’s always good practice to have these items in stock or at least know a reliable service center (we suggest Lewis Systems), that normally has these items in stock.
- Not Building Pressure: Number one cause: a dirty inlet air filter. Also problems with the inlet valve or minimum pressure valve. Both should be inspected and cleaned on a regular basis. Both normally have packing rings or seals that need to be replaced occasionally.
- Inlet Valve Maintenance
- Excessive Oil Carryover: A common cause for oil carryover is a blocked or faulty scavenge line check valve. Oil separators can rupture if they are not changed on a regular basis which will cause oil carryover as well.
- Routine Maintenance Items: Changing the air filter and oil filter on a regular basis will prevent many problems. It will also extend the life of the compressor lubricant and oil cooler.
- As you can see, there are lots of maintenance and repair issues that should be addressed on your air compressor. Don’t forget that Lewis Systems & Service Co., Inc. has a fully staffed service department at each of our locations to assist you. From emergency repairs to proactive maintenance agreements we can help keep your plant up and running.
