Remove the rear cover. Remove the overload/relay (#4 on the
diagram) from the compressor and shake it. If it makes a rattling sound, replace it.
If the new part would not solve the problem, then the compressor itself has gone bad.
- The overload/relay
Part number: AP4009244 
Here are the breakdown diagrams and
Replacement parts for ADMIRAL ASD2120DRW Ref - SXS/I&W | AppliancePartsPros.com
Gene.