Glad you found them, good that you found the front one. Yours must be newer than my old 612 it was a 1992 model. I have a 2013 725DT and as you said the grease fitting is accessed from the front under the front platform.
I've had a 1980 1600, 1992 612, 2001 721 and currently have a 2013 725DT. They all were great mowers in their on right but with each newer model was noticeably improved. But of all the improvements the one I couldn't do without would be the Grammer Air Suspension seat, I have some disk issues that would limit me to a few hours a day now I could put in a full day without any discomfort.
This is a great form to follow I learn new things all the time, no question is a silly question. I have found that 99.9% of the members are very courteous and helpful.