1980 450SL Power Steering Pump Leak Diagnosis
 

I have noticed a constant leak with my power steering fluid. I did a little research and see that a common cause is a leak in the gasket in the front, or potentially a leak in one of the hoses. I just took a closer look to try to see where it was wet, and it looks like it's relatively dry in the front where I understand the gasket is, as well as around the hoses. Where I am seeing it wet, however, is both on top as well as in the back (back left if you're looking at it from the front), almost where it bolts on. See the pictures attached. Any ideas what may be causing this leak? is there a gasket in the rear where the pump bolts onto the engine?

Thanks!

Your cover looks wet. Just might need it's gasket replaced, part number 000 466 15 80.
Might be a good time to check the condition of the power steering fluid and change the filter 000 466 21 04.
Lots of threads about flushing and changing the PS fluid on this site.