loud hum from compressor, cycling overload switch, no cooling.

I could hear a loud hum from the compressor motor cycling on/off every 5-10 seconds. Pulled the capacitor and relay switch from the compressor. Checked compressor terminals with ohmmeter, no shorts to ground so it was ok. A gravely substance rained out of the overload relay switch when I removed it, so I assumed it was bad. Didn't need to check the capacitor as it was only another $20 or so to replace. Also didn't notice any oily residue that would signify a coolant leak, so assumed the system was still pressurized. New relay switch and capacitor plugged right in, no tools needed. Re-secured the assembly with it's original keeper clip wire and I was done. Plugged it in and made sure it was cooling properly before replacing the various back cover panels. Like a new reefer! Couldn't have been easier. Just be careful with the capacitor when you remove it. It could hold a lethal electric charge.