Posted by bc on May 07, 2010 at 07:42:00 from (65.66.85.21):
In Reply to: Hydraulic Hissing? posted by Brad_bb on May 06, 2010 at 22:24:09:
To me the hiss sound which also may may also be described as a high pitched whine sound, is from fluid in the power steering setting off the popoff/relief valve(s). I bet it the same sound if you turn the wheel all the way to the left or right and hold it tight.
I don't know what kind of steering valve mechanism or hydraulic system you have in there but typically after turning the wheel and stopping, the fluid should just neutral flow right on through. Something in the steering control (either gears or pistons) may be gummed up with crud or something and/or sticking so it does not release to the neutral flow position.
Sounds like you are headed to a steering valve disassembly, cleaning, and repair.
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