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Billy,
I agree with Bear on the pressure gauge, you really need one to do
any real diagnosis on the hydraulic system. If you have one, put it
between the pump discharge and the control valve.
If you don’t have access to a gauge you can try cleaning the by-pass
valve in the control assembly. There is usually a pressure relief / by-pass
valve in the control valve assembly that will limit the cylinder’s exposure
to max pump pressure. This by-pass might be “Stuck” open. You can
remove the slide and spring and make sure they are clean and move freely
in the bore. If you post a pic of the control valve we can probably locate
the access to the by-pass valve for you.
One more thing, does the bucket move? If you tried to move the bucket’s
control into the dump position, will it rotate all the way around.
Starting with the bucket flat on the ground, it should be able to lift the
front of the tractor as it moves into the dump position.
If the bucket’s cylinders seem strong, I don’t think the problem is related
to the pump or the by-pass valve and we should focus on the cylinders for
the arms or the side of the control valve feeding them. If both the arm and
bucket cylinders seem weak, then the problem is either with the pump or
the by-pass valve.
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