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I see this quite a bit at work. You can poke the zerk with a small allen wrench. No need to get a tool you don't need. If you have an allen wrench set, then you're set.
If that doesn't do the trick, I heat the fitting and the imediate area with a small propain tortch. Then try...if that fails, I remove and stick the allen wrench in the hole and see if there is an obstruction there. I normally chainge the zerk at this point since the old one is already off.
On the high rail trucks (rail road pick ups that drive on the rail road tracks) it is VERY common for them not to take grease. We have had to heat them up with cutting tortches untill cherry red, crank up the compressor to 125PSI, and even then, sometimes it won't take grease. Hate it when it gets to this point, we have to start taking arms and stuff off the system.
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