Joseph Marasco
Active Member
Doosan XP 825, Cummins ISC power.
Mechanically the compressor works perfectly. We purchased this unit last summer with a plethora of issues, including a blown out drive coupling for the air end. I replaced the coupling and changed the separator, performed routine maintenance on the unit, and worked the bugs out.
Start up the engine, runs great, and bypasses air properly. Here's where the issues are. Once I activate the "Service Air" switch, RPMs build and we're compressing air. Once the service valve is closed, the airend starts to unload, but continues building pressure and overpowers the engine forcing shutdown. When I release system air pressure the engine fires right back up, no issues.
If I actuate the Service Air switch with the service valve closed, the unit moves directly into "Unload" and runs in bypass with no issues. Open the service valve, we're compressing as it should. Close the valve, engine slowly shuts down as in the last scenario. Now for the proverbial "wrench in the gears".... This is an intermittent problem.
One day the compressor functions flawlessly between service air and unload multiple times during our work day. The next day it will act as I described above.
Hopefully one of you can help me. Thanks in advance!
Mechanically the compressor works perfectly. We purchased this unit last summer with a plethora of issues, including a blown out drive coupling for the air end. I replaced the coupling and changed the separator, performed routine maintenance on the unit, and worked the bugs out.
Start up the engine, runs great, and bypasses air properly. Here's where the issues are. Once I activate the "Service Air" switch, RPMs build and we're compressing air. Once the service valve is closed, the airend starts to unload, but continues building pressure and overpowers the engine forcing shutdown. When I release system air pressure the engine fires right back up, no issues.
If I actuate the Service Air switch with the service valve closed, the unit moves directly into "Unload" and runs in bypass with no issues. Open the service valve, we're compressing as it should. Close the valve, engine slowly shuts down as in the last scenario. Now for the proverbial "wrench in the gears".... This is an intermittent problem.
One day the compressor functions flawlessly between service air and unload multiple times during our work day. The next day it will act as I described above.
Hopefully one of you can help me. Thanks in advance!