If is a MCH-6 clone then these video might help with taking the compressor apart. I’ve been using a MCH-6 for a few years.
https://www.nuvair.com/support/video
https://www.nuvair.com/support/video
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Generally compressors are shipped absent of OIL needing to have crank case refilled with the appropriate compressor grade lubricating oil prior to use. Not accusing, just stating a possibility if unknown and sadly happened ?
Just ordered a Daystate (Coltri ?) from AOA $2000