I have an 89 John Deere 575 that I had to replace the drive coupling and primary pump drive shaft. I bled everything, worked out all the air ( I think) and it works very well. My only issue is that when I shut the machine down or idle it there is some creep on the right side. At anything above idle the machine does not creep at all. When both levers are full forward it follows a straight line. Does anyone have any ideas? Thanks