Posted by Owen Aaland on July 24, 2009 at 08:29:30 from (207.13.114.194):
In Reply to: 656 Hydro Problems posted by theponyroper on July 22, 2009 at 12:01:50:
The two lines are the ones that come out of the left side of the hydro housing near where the control rod goes in. By using the caps you can quickly determine if the problem is internal or external.
With the caps in place the spool valve that the sideways movement of the speed lever controls is no longer in the circuit. Neither is the Foot-N-Inch valve. The only control left working is the forward/reverse lever. There is no way to stop the tractor except by moving the speed control lever. Try this only when you are outside with plenty of room around so you don't run into anything. If you must do it inside a shop be sure to raise the rear wheels off the floor so you don't hit anything.
The high pressure relief valves are pilot operated valves. They are located the the hydro center section but are controlled by the Foot-N-Inch valve. They are designed to open at 5000 PSI but since they are pilot operated you can push them open by hand when you have them out. With the caps in place they will not open unless the jumper line between the relief valve and the housing is cracked.
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