I have a 2001 ML320 with a leak at the junction between the power steering resevoir and the power steering pump. Is there an o-ring or seal that can be replaced there?
Can some one tell me how to do this? Does the V belt have to be loosened ? Does the pump itself have to be removed?

Also, where can I get a Service / Shop manual for this car?
Thanks, Perry
pdmerlo@aol.com

I just did this for a friend on his 2002 ML320. His leak was in the same place. I replaced the O-ring (it is actually triangular in section, not round) and was advised to replace the reservoir as well, as there have been problems with them. I think that is actually what was leaking, it appeared that there was a small split in the area where the two halves are put together. It was an simple job, took about 20 minutes. There is a retaining clip at the back where you are seeing the leak - it pries out with a screwdriver. There is one bolt at the front. It is hard to get off due to the O-ring and there are two grooves molded into the reservoir that act to retain it to the aluminum piece that the bolt goes into. It is even harder to wiggle back in. The O-ring is about $1.40 and the reservoir was about $35 from a local parts dealer who sells MB genuine parts at 10% off.