Air Compressor Parts Guide: What They Do and How to Maintain Them

An air compressor isn’t just one unit doing all the work. It’s a system: valves, filters, belts, separators, each doing its part to keep pressure steady, air clean, and operations smooth. When one piece goes, the whole setup feels it. Pressure drops. Energy gets wasted. Sometimes, it all stops.

Knowing what each air compressor part does and how it fails isn’t just technical knowledge; it saves time, cuts service costs, and keeps you off the maintenance call list. This guide cuts through the clutter. You’ll spot warning signs faster, choose between OEM and generic parts with confidence, and keep your equipment running without surprises.

Key Air Compressor Parts and Their Functions

Let’s break down the components that keep your compressed air system functioning at peak performance:

1. Compressor pump
   

   The system's major component is the compressor pump. It pulls in outside air and squeezes it to the level your system needs. How well it does that, how fast, how much power it takes, depends entirely on the pump type. Centrifugal. Reciprocating. Rotary screw. If that pump slips up, expect poor airflow or a full stop.

2. Air filters
   

   
   Air filters catch the grime before it gets in. Dust, dirt, metal bits, without a good filter, they clog the internals and wear everything down faster. Atlas Copco’s filters are built to handle that job properly, built for longer life and steady output.

3. Pressure Switch & Regulators
   
   

   The regulator maintains constant output pressure to your tools, while the pressure switch regulates the motor's start/stop cycle.  If something goes wrong here, your entire line may perform poorly or pose a safety risk.

4. Lubrication system
   

   
   In oil-lubricated compressors, the lubrication system minimizes friction and overheating. Using substandard oil can compromise internal components. Always choose genuine compressor oil and lubricants for the best results.

5. Hoses and fittings
   

    

   These deliver air to your pneumatic instruments.  Poorly attached connections and hose leaks or cracks are frequent causes of pressure decreases and decreased efficiency.

6. Storage tank (air receiver)
   
   

   Compressed air is stored in the air tank, which also regulates pressure changes.  In order to preserve system consistency and safeguard downstream equipment, proper size and routine inspection are essential.

Signs of Failing Air Compressor Parts

Failing parts don’t always lead to an immediate shutdown—but the warning signs are there. Watch for:

• Inconsistent pressure: Failing parts don’t always lead to an immediate shutdown—but the warning signs are there. Watch for:
• Pressure swings: Could be a bad valve, faulty switch, or regulator gone off track.
• Overheating: That usually points to old seals, weak lubrication, or filters packed with debris.
• Too loud: Knocking, rattling—those sounds often trace back to loose belts, bad bearings, or something off with the valves.
• Oil leaks: Oil showing up where it shouldn’t? Gaskets or seals are likely failing.
• High energy use: Energy bills creeping up? Look at internal wear or pressure losses from hidden leaks.
  
  Atlas Copco’s Fixed Price Service gets a tech on it fast—no guesswork, no unexpected costs. Just straight fixes.

OEM vs. Aftermarket Air Compressor Parts: What’s Best for You?

When it's time to replace parts, you face a critical decision: stick with OEM (Original Equipment Manufacturer) components or save money with aftermarket alternatives.

OEM (Genuine Parts)

• Engineered to fit and function with your specific compressor model
• Backed by warranty and performance guarantees
• Maintain energy efficiency and reduce long-term wear
• Explore OEM Parts from Atlas Copco

Aftermarket Alternatives

• Often cheaper upfront, but may void warranties
• Generic specs = performance mismatch and premature failure
• Inconsistent quality and risk of increased energy use

As outlined here, the long-term risks of using non-original parts far outweigh the savings.

If you have any questions, contact us now or visit our web shop to browse our spare parts by clicking here.