Troubleshooting the Ingersoll Rand P185: Regulation System Problems
This guide covers common issues and solutions for Ingersoll Rand portable compressors—including models P185A-SJD, P185A-WJD, XP175A-SJD, and XP175A-WJD. The regulation system keeps everything running smoothly—until it doesn’t. If you’re seeing performance issues like surging engine speeds, incorrect pressures, or a safety valve that won’t stop popping off, this post will help you pinpoint the problem and fix it fast—no service call required.
1. Air Discharge Capacity Is Too Low
Causes:
- Regulation set improperly
- Main unloader spring has failed
Solution: Double-check your regulation settings. If the main unloader spring is worn or broken, it won’t respond to control pressure changes as it should.
2. Cannot Obtain Correct Engine Speed
Causes:
- Regulator valve set too low
- Plugged regulator bleed orifice
- Plugged regulator bleed orifice silencer
- Debris in regulator valve
Solution: Remove and inspect the regulator valve and bleed orifices. Clean or replace any components showing signs of clogging or buildup.
3. Unit Will Not Unload
Causes:
- Regulator valve set too high
- Blocked inlet to regulator valve
- Ruptured regulator diaphragm
- Leaks in regulation hoses
- Ruptured unloader diaphragm
Solution: Start by adjusting the regulator. Then inspect hoses and diaphragms for leaks or rupture. Clear any blockages at the regulator inlet.
4. Oil Consumption Is Too High
Cause: Operating pressure is too low.
Solution: Increase the pressure setting to within spec—low operating pressure can prevent oil from returning properly through the scavenging system.
5. Excessive Carryover of Oil Into Air Discharge
Cause: Operating pressure is too low.
Solution: Similar to above—verify and adjust your regulator to increase system pressure within the manufacturer’s recommended range.
6. Compressor Is Overheating
Cause: Operating pressure is too high or too low.
Solution: Stay within the proper pressure window to avoid stressing the compressor and oil system. Too much pressure builds excess heat; too little can lead to poor cooling circulation.
7. Safety Valve Popping Off
Possible Causes:
- Operating pressure is too high
- Regulator valve set too high
- Blocked inlet to regulator valve
- Ruptured regulator diaphragm
- Leaks in regulation hoses
- Ruptured unloader diaphragm
Solution: Inspect the regulator settings first. Then check for diaphragm issues or blockages in the regulation line.
8. Surging Engine Speed
Causes:
- Orifice in regulator valve is too small or restricted
- No tension on inner spring in engine speed control
- Broken engine speed control springs
Solution: Clean out the regulator orifice. If the engine speed fluctuates wildly, inspect the control springs and replace if worn or broken.
9. Start Pressure Is Too High
Causes:
- Blocked inlet to regulator valve
- Ruptured regulator diaphragm
- Leaks in regulation hoses
- Ruptured unloader diaphragm
Solution: Clean the regulator inlet and replace any ruptured components. Leaks in hoses can also create false pressure readings during startup.