Posted by JMOR on March 14, 2012 at 15:14:32 from (72.190.9.193):
In Reply to: Ford 600 hydraulics posted by newlife on February 29, 2012 at 10:32:52:
Quoting Removed, click Modern View to see"Bypass" is likely key word. Sounds more & more as though your unloader valve is stuck in the position where it is allowing all flow to be directed through the low pressure (~40psi) back pressure valve & return to the sump. You seem fairly intent on seeing that pump is actually capable of producing pressure. This can be accomplished by blocking flow ahead of the unloader & back pressure valves. This is done by installing the 3X5 plate with the left side (in my earlier pictures it is at bottom of picture) positioned over the right side (top of my picture) of the top cover (use piece of gasket material or tablet backing card board between the two). What this does is block #7 (the feed from the pump). Now, when you start engine/pump, the only place for flow to go is to the overpressure safety relief valve in belly of hyd compartment. It should relieve at 1950-2050 PSI & you may hear it buzzing or squealing. You will need to connect your gauge at the pump (same place you connected hose to observe for bubbles). If pressure good here with this set up, you can have some degree of confidence that it is the unloader valve. If still no pressure, we go elsewhere in our investigation.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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