I have bought my first used bobcat (632) and have two question if someone can help that would be great! i would like too change the pivot pins at the bottom of the bucket? is this a big job,can i do it myself? i do not have any matinance manuals for this machine. I have the ford gas engine in this machine! there is a small amount of smoke that comes out of the oil breather cap on the valve cover. the machine has about 1,200 hrs, is this a big problem.