Why Is My Atlas Copco XAS 185 Compressor Capacity or Pressure Below Normal?
If your Atlas Copco XAS 185 portable air compressor isn't reaching its normal capacity or pressure, it can slow down your entire jobsite. Instead of guessing, here's a practical list of common faults to check and exactly what to do about each one.
1. Choked air filter elements
When air filters become clogged or dirty, they restrict airflow and reduce overall compressor performance.
- Suggested action: Remove and inspect the elements. Clean or replace if necessary. Also check the air filter service indicator (vacuum indicator). If the red band shows completely, the element must be replaced and the indicator reset.
2. Loading valve leaking past the o-ring
A leaking loading valve can prevent the compressor from building or maintaining proper pressure.
- Suggested action: With the compressor running at maximum load speed, disconnect the hose leading to the unloader. If air leaks from the hose, remove and inspect the loading valve. Replace any damaged or worn o-rings.
3. Safety valve leaking
A leaking safety valve can result in pressure loss and unstable compressor performance.
- Suggested action: Remove and inspect the safety valve. Replace if it’s not airtight after reinstallation. Check that the safety valve operates freely and isn’t plugged by dirt or deposits.
4. Blow-off valve leaking
The blow-off valve is designed to release excess pressure, but if it’s leaking when it shouldn’t, you’ll lose critical air pressure.
- Suggested action: Remove and inspect the blow-off valve. Replace if necessary. Make sure the regulating system is adjusted correctly so the valve only opens when intended.
5. Clogged oil separator element
If the oil separator is clogged, it can restrict air flow, cause higher internal pressure, and reduce capacity.
- Suggested action: Inspect and replace the separator element according to the service schedule or if there's evidence of restriction. Check for signs of oil carryover and confirm the scavenge line is not blocked.
6. Faulty minimum pressure nozzle (MPN)
The minimum pressure nozzle helps maintain system pressure and proper oil injection. If it is malfunctioning, it can cause poor pressure build-up.
- Suggested action: Inspect the minimum pressure nozzle for clogging or damage. Clean or replace if needed to maintain correct system pressure.
7. Malfunctioning regulating valve
The regulating valve controls air output based on demand. If it's stuck or improperly adjusted, it can lead to low capacity or pressure fluctuations.
- Suggested action: Check that the regulating valve responds properly to pressure changes. Adjust or service it according to the manual instructions.
Final thoughts
Keeping your Atlas Copco XAS 185 in top shape means regularly checking these key components. Addressing leaks, blockages, and worn parts early helps you avoid downtime and keeps your compressor performing at its best.