1985 300CD-T W123.153 494 California - A/C Compressor and ACC Climate Control

[kalikar85]

So I started today on the project of getting the AC working in my 1985 300CD-T W123.153 494 California.

Going by the diesel giant 'How to repair your A/C pictorial'...
How to Repair Your A

Im just going to flush, charge, and oil the system and hopefully not have to buy any parts.

I went to unplug the compressor to flush the lines and I saw this:
no belt on compressor

Shouldn't there be a belt on there?
It sounds really rough like metal on metal if I spin it by hand..
Is there a way to test the compressor?