Posted by Chris Case [107.201.30.175] on Thursday, September 19, 2013 at 17:38:56 :
In Reply to: Watco 303HC Floor Jack Help needed. posted by Paul (in NY) [12.64.114.66] on Thursday, September 19, 2013 at 15:44:51 :
A goodly tap on the ball will assure that the seat matches the ball.
But my guess is that it is an assembly error, some dirt under a valve or wrong spring against the pressure relief ball, or a kink in a cup.