I have recently replaced the travel control plate on my 646. Forward travel now seems to be very strong, with good response from the speed control pedal. However, I've clearly done something wrong, as reverse has almost no power at all, barely enough to move the machine. Looking at the linkage, it seems that when the direction control lever is in the reverse direction and the speed control pedal is pushed the linkage tries to push in the TCV spool, but the combination of the spool being able to turn and the ball joint movement, the linkage simply turns to the side and barely moves the spool. Clearly, I have something wrong here, but I'm not sure how it EVER worked like this. I'll try to upload some pictures tomorrow, but if anyone has any ideas I would greatly appreciate it!