Air escaping from Speedaire 3Z180 air compressor pump

Published Categorized as Speedaire 4 Comments on Air escaping from Speedaire 3Z180 air compressor pump

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by Allan Ryan
(Wading River,Long Island)

Air is escaping from the vent in the front of the governor casing.

It seems to be fed from the tube that runs from the outlet of the high pressure piston that runs to the storage tank.

There is a tube connection to the outside of the governor casing from the top of the discharge port of the hp cylinder.

I removed all valves on the piston heads,disassembled,cleaned and re-installed..Still have the same problem. This is a Speedaire compressor 3Z180 Champion dual stage pump. The ID. at the pump base is: NR-14-6A.

Any suggestion would be appreciated.

Thank-you, Allan Ryan


I suspect the problem may be a leaking tank check valve, Allan.

Please see the check valve page on this site for complete information about how this component works and how it prevents air leaking from the tank out the unloader valve when the air compressor is off.

If that isn’t the issue, please add a comment.

3z180 air escaping

by james
(Chatt. tenn)

I have 3z180 compresser.

Speedaire 3z180 Pump (
Speedaire 3z180 Pump (

Air is escaping from vent in front governor casing.

I have install new check valve.

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Has anyone been able to resolve the leaking from front vent??? Having this issue as well.
Cleaned check valve, and no luck.

It may not be clear from the immediate above, but that is an unloader valve. It is normally open when the pump is stopped. It closes when the pump starts.
If you are losing air from the tank when the pump stops, your check valve near the tank is leaking. You may be able to clean and repair it, or you may have to replace it.
Sounds like you may have to replace yours, or take another shot at cleaning it.

Last edited 2 years ago by Doug in

Check Valve replaced, and new air filter. Back up and running, thanks for the help!

You are quite welcome.
And thanks for letting us know how it worked out.