Posted by bc on May 04, 2009 at 11:41:26 from (71.158.222.135):
In Reply to: 2755 hydraulics posted by brandonh on May 03, 2009 at 20:08:39:
Don't know about a 2755 but if you have a 2756 then it is the same as my 2606. I'd take a look at your flow divider valve or the steering pilot valve. They both have a valve that moves inside that could be leaking by or sticking or have a bad oring. When you lift a heavy load, you put max back pressure on the system and on that valve spool. Without looking at the diagrams again at caseih.com I believe they have a check ball or two and maybe has some crud holding one open a little. I've opened one up on the pilot valve but it points down and it is easy to lose the ball and spring and hard to stick them back in up hill.
On the other hand, there should be a check ball/valve in your loader actuating valve so no pressure should get back to the flow divider.
The more I think about it and tracing back from the bucket, you should start with the loader valve. Maybe a check ball/valve, oring, or a leaking valve spool.
Let us know what you figure out. A pressure guage in certain places may tell you a lot but not cheap to do but one between the pilot valve and loader valve may tell you if there is any surging when picking up a heavy load.
Maybe one way to check is to get your loader bucket loaded with the load that causes the problem and then disconnect the two lines going to the steering cylinder (with engine off). Without touching the steering wheel, you should have little or no fluid flowing to the steering cylinder when engine is running. Then (engine back on) try your bucket and see if one of the lines starts spurting fluid. But this may be a waste of time too.
The pilot valve mentioned earlier also has a bypass that goes to the oil cooler and then returns to the rear. Any surge in psi above its setting should divert fluid there and not back into the steering so maybe its plugged or leaking by.
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