Posted by JMOR on March 19, 2012 at 10:20:31 from (72.190.9.193):
In Reply to: Ford 600 hydraulics posted by Mark K on February 29, 2012 at 10:32:52:
Bob's words: "I am fuzzy on the hydraulic flow and what valve does what. If there is pressure to the lift cover and we move the control lever, the control valve directs oil into the lift cylinder and the lift raises? Since this does not happen even with no implement attached, seems like either we are failing to move the control valve properly (linkage) of the oil is not reaching the control valve. Are either the unloading valve or the control valve between the control valve and the oil entering the lift cover?"
My response: No, the control valve does NOT direct oil into the lift cylinder.
To initiate "LIFT", the linkage moves the control valve toward the front of tractor, which allows smaller left portion of its spool to connect the passages leading to both the left & right sides of the steel-ringed part of the unloader valve. This puts equal pressure on both sides of the steel-ringed 'piston' & since the area of the left side is larger than the area of the right side, the force moves it to the right. This positions the rear smaller diameter of the unloader spool such the it blocks the "5" passage from connecting to the parallel passage to the right of "5". This blocks the free flow from the backpressure valve to dump into the sump. Once the free flow is blocked, then the pressure rises & has no other place to go other than through the check valve & into the lift cylinder. You should be able to follow all this in the diagram which I posted earlier.
In a nut-shell, the unloader valve is closer to directing the flow to lift ram cyl that the control valve. The control valve ultimately controls this, but in a rather indirect fashion which I just described.
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