1969 Case 580ck weak reverse

My 1969 Case 580ck (named Missy) has switch symptoms a couple of times. She presently has a weak reverse. She has had this problem a few months ago but then for a brief 2 weeks she worked well in reverse (able to drag herself backwards with the front wheels off the ground) and forward also worked well. Like I said it was a brief honeymoon, we are back to a weal reverse. These are the things I have done.

1. Rebuilt the Shuttle Control Valve (new seals, springs, and o-rings
2. Rebuilt...

1969 Case 580ck weak reverse

1969 Case 580ck weak reverse