Not familiar w/your machine- when you say quad mast- does it have 1 primary cylinder for the free lift & secondary outboard cyl's for the rest of the stages? The gate test usually shows- w/your results- a faulty hyd control valve.
When the drift occurs- which cyl('s) are contracting?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.