1. If there is a hard rod, the rod can be pulled several times, so that the air inside can be mixed with grease, reducing the volume of a single bubble may be solved, but the effect is not always good.
2. The most effective method is the exhaust method, but it needs the support of the hardware. Generally, the Grease Gun has the design of the exhaust port. When you slowly open the exhaust screw, the air inside will come out.
3. The last trick I got from a friend was to say that it works very well, that is, when you feel that there is gas in it and you can't shoot it out, just rotate the oil gun and pump body to combine the threads a few times or back (preferably while turning the pressure), to ensure your success. The reason is not difficult, that is, when you turn, the air bubbles are actually rotating.
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