The most time consuming tasks were:

1. Removing the pump from the car (because there were two extra bolts I did not know of).
2. Removing the split ring on the pulley shaft.

It is difficult to imagine what could cause a PS pump (at least the ZF pump that I have) to require replacement. The parts are too few, simple and strong to fail. Only the front seal should ever need to be replaced.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black