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I'm thinking you raise the round unloader cover up and insert something thin & rigid to hold the inner piece downward against the spring so that the cylindrical part disengages with the cover. Then the cover can slide off.
Here is a post where someone who knows, CSM Davis, confirms the unloader can be removed without pulling anything...
http://www.steelsoldiers.com/showthread.php?123224-M939-8-3-cta-compressor-failures-need-function-info&p=1537915&viewfull=1#post1537915
Here is a post that shows the unloader parts that stick...
http://www.steelsoldiers.com/showthread.php?141256-M939-Inconsistent-air-pressure&p=1735694&highlight=#post1735694
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