They are hard to get a gun on fully to allow grease to flow. I did change out some of them with angled zerks so that I could grease them without a flexible hose for the gun. You might just take a zerk out to see if grease can flow through it. I didn't have to do this...half of my zerks were missing when I did my first grease job and others were only finger tight. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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