There are a number of things that might cause such a noise. First, let me say that your symptom is that of a weak pump or low pressure. By nature, hydraulic pumps tend to be noisy - vane pumps more so than gear pumps. Scoring on the pump surfaces can cause noises. Scoring allows minute amounts of air or oil vapor to be brought in to the compression area. These bubbles collapse and cause what is called cavitation. A weak spring in the relief valve can also cause noise. A weak spring allows too much volume to pass through the pump causing a louder than normal noise. You said that there were some issues in the 3-point at times. That indicates that the pump could also be starving for oil. If there is any kind of inlet filter, that could also be causing a restriction that might under some conditions cause the pump to starve for oil. Also, a slight relocation of the lines to keep them from touching each other or anything else might help. There is also the possibility that the noise is the result of a harmonic vibration coming from another part of the system. My gut feeling is that the pump is worn causing the noise.
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