Posted by Owen Aaland on May 13, 2009 at 17:18:44 from (65.165.246.54):
In Reply to: Hydro posted by RickB on May 13, 2009 at 16:33:32:
The two lines coming out of the hydro case are internally connected to the high pressure relief valves in the hydro unit. One for forward and the other for reverse. They are pilot operated relief valves where the Foot-N-Inch valve serves as the control for them. When you cap off the lines the relief valve will not open no mater how much pressure they are exposed too. That is one reason it can be dangerous operating with the lines capped. The proper way to test is to connect the two lines to a pair of industrial series Foot-N-Inch valves. They are the same as the farm tractor except they have an internal spring.
Common problems for sudden failure are either a relief valve stuck open or a broken line connecting the relief valve to the fitting on the case. Since the relief valves are pilot operated they take very little pressure to open them when they are out of the system. Removing them can cause them to close even if they are stuck open. They way to check them is to use a piece of wire to measure the location of the inner spool before removing them. Remove the jumper pipe and stick the wire through the hole in the fitting.
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