The ASD in my roommate's 1991 W126 350SDL might be acting up because the triangle light on the dash keeps lighting, the hose that goes back to the differential keeps moving away from the oil pan and then slamming up against it, and the ASD module or whatever by the differential keeps going HISS...HISS...HISS...

Also, the power steering pump is failing and it's extremely hard to turn the steering wheel at low speeds.

To add insult to injury, rebuild kits for the tandem pumps (0004608080) are no longer available. They show up on almost every parts site until you actually order one, and then your money is immediately refunded with an apology email about all brands being backordered with no ETA.

Rebuilt tandem pumps are about $1,000.

So, removing ASD and going to a common power steering pump may indeed be the way to go if possible!

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles