I have a 1999 753 I have been using it to clear some land I purchased. The Bobcat has functioned great until know. The left side steering is no working as desgned. When I hold both handles back and try to drag the bucket the right wheels turn and will pull the machine but not strait. The left weels have no power at times they will work but is all or none. The sterring on the left will grab sometimes and wok. The left handle does appear to be a little on the mushy side. I raised the cab and steering linkage that opens the valve to the drive motor appears to be ok. Is The drive motor going bad? Thanks in advance.