If the oil is coming from up around the cylinder it could be from the upper hose connection or a hose that supplies the bucket cylinder. Just had mine mostly apart over the winter. I would think that you would have to lower the boom over the edge of a high wall to remove the boom cylinder without removing the hoe from the tractor. Not the easiest thing to work on.
On a side note I found that the hose clamp bolts on the dipper for the bucket cylinder were too long and were wearing into the bucket cylinder. I replaced with shorter bolts.
