When I had an Omega Air Charger it had a grease pot like many of the mid range compressors have. It is very important when packing it, and maybe even checking the initial packing the factory did, to assure there aren’t any air bubbles in the pot. If air bubbles are present you may get air instead of grease during one of the lube cycles.
I removed every bit of grease and then put a small bit of grease in the pot, then on a firm sponge, or piece of ruber or wood, bang it straight down on the threaded nipple like cigarette smokers do to a fresh pack of cigarettes to get the tobacco firmed up. You will see any air come to the surface like bubbles in lava.
Do this as many times as it takes to fill pot, then install cap and before reattaching to compressor, turn cap till you see grease extruding out the threaded end. That way you know grease is actually coming out with each time you turn the cap.
With the pot method, you really don’t know for sure if grease is actually getting to the pump, and the method like medication where “if a littles good a lots better” doesn’t hold true on compressors.
I personally never trusted it so I would unscrew the dinky intake filter and elbow that screwed into the head and as I turned the pot I actually look into the intake port to actually see some grease extruding.
That design of greasing is like snorting cocaine, each intake cycle draws the blob of grease and by some sort of black magic allegedly thoroughly greases the moving parts
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