The problem is that without grease already in the head of the grease gun, the piston is pumping air and you may need to help push the grease up and out of the cartridge to get things moving. 1) When you screw on the barrel after loading a new tube of grease, back it off a full turn to allow a little air to seep out.
How do you free up a stuck grease fitting?
Heat up clogged grease fittings and pins with a standard hair dryer or a heat gun on the low setting. Attach the grease gun and use it immediately; the new grease will push the now-softened older grease out of the way and unclog the fitting.
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