A slender oil pipe with many elbows and not fixed could cause the pipe to shake when the oil flow rate is high. An unbalanced rotating part of the motor and hydraulic pump, poor alignment during installation, or loose coupling can generate vibration and noise.
[pdf] First, check that there isn't a very high air demand, or air leak somewhere. If the capacity of the air compressor is really too low, check the following: Check differential pressure over oil separator. Replace separator when necessary. Check and replace compressed air filters (if installed).
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