The Equilizer bolt on my tandum axle Trailer has a grease fitting can't get any grease into it. It looks like the fiitting is part of the round head has anyone ever unscrewerd the fitting or is it pressed in? Or do I have to replace the whole bolt. Sorry no photo

Most grease fittings screw in. I'd try to remove it and go to the parts store to match it up.

A little heat also works most time.

Depends, our fittings at work could be either.
Actually our most common are pressed in.
Does the zert have shoulders needed for a wrench? Or is it round completely?
Hex allows you to put a wrench on it, if not its pressed. I personally have never seen a threaded one without flats on it, or hexed.
If yours looks like this one, then it is threaded
http://www.etrailer.com/Accessories-...07-187-00.html

If it looks like this one, it is pressed in.
http://www.etrailer.com/Accessories-...ine/126B2.html
Check out this page, I have ordered plenty of parts from them in the last month!
Cole has been a great help and she is very knowledgeable at her job!

http://www.etrailer.com/dept-pg-Acce...sion_Bolt.aspx