We have a Hyster 60. This fork lift came from government surplus and the plate with the model number was removed, so I don't have that info.
The problem is when lifting the second stage lifts first.
Just for clarity, the first stage is lifted by a single cylinder until it reaches the top of the uprights, then the second stage begins lifting by two cylinders.
I have not been able to figure out what switches the hydraulics from the first stage to the second stage. I don't see any switches or valves on the uprights that sense the position of the first stage to cause the change.
So my question is what causes the change from fist to second stage lift? If anybody has any idea what is causing this problem, please let me know.

Thanks Glen