Is Anyone Here Familiar With ASD/SLS Systems? I Have Questions And Can't Find Answers - Page 2 - PeachParts Mercedes-Benz Forum

Squiggle Dog · #16 11-07-2017, 04:35 PM

I might start rebuilding the tandem power steering pump this coming up weekend and hope that I can get it done in one weekend because my roommate doesn't have a second car (since some nice person smashed the rear window of his 1965 Ford station wagon and if it's driven the window will collapse).

Does anyone know if the ASD accumulator can be replaced without losing a bunch of fluid? At some point in the near future he may buy a new accumulator and I'm hoping it can be swapped out without losing all the new hydraulic fluid. Hopefully that will at least stop the lines from knocking.

Squiggle Dog · #17 12-06-2017, 11:26 AM

I finished rebuilding the tandem power steering pump. That was interesting. The inner lip seal that separates the two different fluids was very difficult to remove and replace.

I also cleaned the ASD reservoir and replaced the filter, which was clogged up with varnish and sludge.

I bled the ASD system according to the factory shop manual. That was also very interesting. The power steering is working again. The ASD system still hisses and the hose still slaps on the oil pan. It's probably the accumulator. I hope it can be replaced without losing a bunch of fluid.

phlfly · #18 12-06-2017, 01:27 PM

Interesting. I would like to replace fluid in ASD system , but I can't find introduction to remove and replace/bleed system. Can you post some directions or pdf with directions?

Squiggle Dog · #19 12-06-2017, 02:26 PM

Quote:

Originally Posted by phlfly

Interesting. I would like to replace fluid in ASD system , but I can't find introduction to remove and replace/bleed system. Can you post some directions or pdf with directions?

Bleeding the ASD system in 10 easy steps:

1. Make sure the car is in park, the parking brake is set, and be sure it's not going to fall on you or roll away when you are under it.
2. Remove ASD relay.
3. Insert jumper wire from the number 8 to the number 10 pin slots in the wire harness where the relay was. I used a coathanger section that I bent to shape and then beveled the edges and filed the sides so it went in smoothly without damaging the wire connectors.
4. Clean up bleeder screw at the right side of the differential by the axle shaft, then attach a clear piece of tubing and feed it down into a container on the ground.
5. Make sure there is enough fluid in the ASD reservoir.
6. Start engine.
7. Loosen screw on bleeder on differential and wait for fluid to start flowing out. Once it flows at a decent rate, watch until no air bubbles come out.
8. Shut bleeder screw, remove clear tubing, wiper bleeder screw clean, and replace rubber cap.
9. Shut off engine.
10. Remove jumper wire and replace relay.

If you want to flush old fluid out of the system, I recommend draining and cleaning the reservoir and replacing the filter and lid seal. Then do the bleeding procedure while topping off the reservoir until the fluid coming out looks clean. Oh, and make sure that you only use magical hydraulic oil (NOT transmission or power steering fluid), either straight from the dealership, or from Febi. There may be other approved brands, but these two are the only ones of which I am aware.

phlfly · #20 12-06-2017, 03:03 PM

Yes, right about fluid. I had question if anyone knows I can use something else, than MB fluids.

Squiggle Dog · #21 01-04-2020, 07:58 PM

So now the hose that goes from the tandem power steering pump, underneath the engine, and to the pipe that goes back to the differential is leaking. Apparently it's still available, part number 126-997-13-82, for $189. I don't know if I dare try to cut off the old rubber and crimp new hose in its place?

jojee · #22 03-16-2021, 02:09 PM

What happened? Any follow to this last post?