Well I'm new to the site and i have a 1990 gehl 6620 i purchased about 7 months ago. i does have the older style servos that sit on to of the hydro pump. i recently broke the right side drive chain so i took it out and replace the chain got 4 new bearing and the axel shaft was worn down, so i had a friend put it in his lath and weld it up and lath it down to correct size. Well while i was waiting i thought i would reseal the servos sence they where leaking any way and now everything is back to gether but the machine walks really bad at low idle and when i start it cold alot of times i kill the battery cause its trying to move and wont stay nuetraled. I also notice that the right side wants to track faster than the left side. any help with any of this would be great austin