Hi all....I read some posts/replies about ajrancher (Bill) and his 863 jerking. I have a 2000 763g I bought new. I have 6,200 hours on it. I run it at full rpms when operating. At full rpms and just easing into the drive levers in forward or reverse I feel as though I am on a bucking bronco. I try not to abuse the machine, but I work it hard. I have an attachment I made several years ago for my business (Super Digger LLC) that I use to dig out stumps and trees of all sizes. On some of the larger trees/stumps 16" +, roots can be 12-14" in dia...On some of these monsters I have to incorporate hard ramming (whiplash/concussion) along with the sawing action. My questions are- - with the similarities of my symptoms with the 763 and Bill's 863, are all the replies directed to him going to work for me? Has the hard ramming I do created a different problem? Is the picture of the 751 hydraulic pump the same as my 763? I greatly appreciate reading what some of the *great minds* such as down under Tazza, skidsteer.ca, the tool, mrdeere1959, have to say. Thank you in advance.