Anyone had an experience with air operated grease guns? I've been using a hand operated one for many years, and a few weeks ago decided to try out the air one. Makes sense-you have less work to do and let the air do it for you. So I tried a "cheap" one at Harbor Freight. Knowing fully there's a wide range from pretty good stuff to absolute crap at that store, and you have to know what you're getting, or it'll turn out to be those "use-it once" tool and it either breaks or is too flimsy to spend time on it. Well, the gun might have been in the latter category. I played around with it for a couple of hours, trying to get it to work. After taking it apart and analyzing how it worked, I concluded the rubber "plunger" did not want to slide inside the cardboard section of the tube of grease. So I cleaned it up and returned the unit.
Just recently I decided to try a more "expensive" one, so picked up Sear's best, with the "continuous flow" feature. (Yea, right). Anyway, same deal here, the plunger just would not go inside the cartridge tube to push the grease into the air pumper part. Yet, on my hand operated one it does. Weird. So I return that one as well. I read both directions on both units on priming, etc, but still no good.
So am I missing something, or is there a trick?