The compressor base should be fixed firmly. If the noise reduced obviously after pressing the compressor with your hand.
Then generally, it is caused by uneven force on the vibration damping rubber pad fixed on the compressor base or loose bolts, and the compressor base plate is not firm. Therefore, it is necessary to adjust and tighten the connecting bolts and change the washer with lost elasticity.
Also, check whether the connection reinforcement part between the outer adjustment pipeline and the box is loose to avoid resonance when the compressor is working. Therefore, the refrigerator compressor must fix the external channel well, and the refrigeration compressor should add the bolt with the spring washer to prevent loosening.
Then generally, it is caused by uneven force on the vibration damping rubber pad fixed on the compressor base or loose bolts, and the compressor base plate is not firm. Therefore, it is necessary to adjust and tighten the connecting bolts and change the washer with lost elasticity.
Also, check whether the connection reinforcement part between the outer adjustment pipeline and the box is loose to avoid resonance when the compressor is working. Therefore, the refrigerator compressor must fix the external channel well, and the refrigeration compressor should add the bolt with the spring washer to prevent loosening.