Air Operated Grease Pumps

Pump ratio describes the mechanical advantage between the air pressure driving the pump and the grease pressure it produces at the outlet — a 50:1 pump run at 100 PSI of shop air produces approximately 5,000 PSI of grease outlet pressure. Higher ratios are needed to push stiffer grease through longer hose runs or tighter bearing clearances without excessive dispensing time.

Yes, in most cases — the pump's suction tube length is sized to reach the bottom of the specific container, and the mounting bung or cover plate must match that container's opening, so a drum pump generally won't fit or properly draw from a smaller keg or pail without a specific adapter. Confirm your container size when selecting a pump.

A follower plate rests directly on top of the grease in the drum and moves downward as the pump draws grease out, maintaining constant contact and preventing air pockets from forming in the remaining grease. Without one, especially as the drum empties, air pockets can form and cause inconsistent or interrupted grease flow — it's strongly recommended for drum installations, particularly with stiffer grease grades.

Stiffer greases (higher NLGI numbers, like NLGI 2) require more pressure to move at an acceptable flow rate than thinner greases (NLGI 0 or 1), so a higher pump ratio may be needed to maintain adequate flow rate and dispensing speed with a stiff grease, especially over long hose runs. Check the pump manufacturer's flow rate specs at your specific grease grade before assuming a lower-ratio pump will perform adequately.

Yes, most air operated grease pumps are designed to run on standard shop compressed air (commonly around 100 PSI), but confirm the pump's required air pressure and consumption (CFM) against your compressor's capacity, especially if running multiple pneumatic tools simultaneously off the same air supply.