Not exactly sure how often I grease. But I do do it when I think about it.... That being said for me, go with what you tractor manual says.... If you have a fitting/pin that stops taking grease, stop right there, and pull pin and check it for clog or whatever.... I recently had one that would not take grease, pulled pin out and applied grease to fitting and it did squirt grease out of hole in center of pin, put pin back in and it did then properly take grease, only real problem was lining up sleeves in bucket and arm to get pin back in... That was worst part of ordeal.... I also tend to wipe excessive squeezed out grease off after greasing so I can see when doing new greasing that the new grease is oozing out of pin/sleeves...