Adding/draining oil from a Ford FS10 compressor

[mcconnell]

I guess the subject line says it all. How do I add/drain oil from a Ford FS10 compressor. There is no plugged port on the case.

Thank you

[Dougflas]

To drain it, remove it from vehicle and turn it up side down. You should rotate the shaft by hand also. To fill it, pour oil into suction port and also turn shaft.