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Hello, head shake with scroll compressors is almost unheard of.
We will need to do a few tests.
First I want to tell you what will cause head shake in a scroll compressor, that is a gross over charge of refrigerant. Can you tell me when the system was last serviced or repaired... and how it worked before that service or repair.
Next you will need a clamp around amp meter to measure the full load amperage at the two wires running to the compressor from the contactor... if the amp draw is very low, compared to the name plate amps we know that scroll rotor is broken most likely.
Beyond that we will need refrigeration service gauges.
Let me know what you can,