Sullair 185 no air

Matt asked 2 months ago

I’m hoping you can help. I picked up a 1997 sullair diesel towable compressor at auction.  It was not running when I got it.  I finally got it running after a new injection pump.  While it’s running it won’t produce any air.  The tank has fluid. I even pull the pressure release on the side of the separator tank while it’s running and nothing.  I’ve tried manually opening the intake valve and it didn’t change anything.  I even thought there might be a problem with the hydraulic thermostat and bypassed that and that didn’t change anything. Is there anything else I can do/test before I tear into the pump?  It seems like l the small air lines are hooked up properly.  Also I’ve been running it at idle mostly.  I did go full throttle with it a few times and still no air. Any help would be appreciated.  Thanks

1 Answers
Cas Staff answered 2 months ago

Hi Matt,

It sounds like the screw element is not running at all – the coupling is broken.

Some machines have a rubber coupling, others are belt-driven.

The easiest way to know for sure is to remove the inlet valve, and crank the engine, you should see the screw turning as well.

All the best,


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