tj: back when i mowed lawns i picked up new a lincon air operated grease gun that mounted on a 35 lb tub on wheels.
it cut my grease time in half the cost at the time was 475.00. i had a air hand gun ,it was a pain you had to change the 14oz cartrige all the time
We use an air operaterated grease gun and we like it a lot. It is the lincoln brand and takes the same size cartridge that the full size hand ones take. It cost around $70.00 and I think it was well worth it but I also keep a hand one around to use on fittings that you can't get to with the fixed end.
Well, I got my new air grease gun today and like it a lot. With my bum shoulder I had problems greasing, but not now. I got one at Auto Zone and it was $35 for the Lincoln. It so happened my new DC was due for a grease job, so I tried it out as soon as I got it filled up.