FWB in SK

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My 3pt isn't working properly. When you leave it sit the arms drop down. Also when it is working and you put weight on the arms it starts to go down then keeps on jerking trying to keep arms in the same place. the Service manual says it is either the lift piston seal or its in the valves. I have determined that it is not the lift piston. But service manual does not say where the problem in the valving could be. Any one else have this problem.
 
How did you determine that it's not the piston seal? We have a B414 with the same malady, just don't use the three-point anymore. Assumed it was the piston seal (o-ring?).
 
Manual says: Turn isolator valve in and if lift arms stop settling leak is in control valve. If lift arms continue to settke leak is in work cylinder. Wish they would say where to look in the control valve.
 

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