Hard Steering after resealed steeringpump

[Nickelager]

Hi!
After the pressure hose between the servo reservoir and the pump burst, I took the pump apart and resealed it. I also took the opportunity to replace all the pressure hoses except the one that goes to the steering gear because I couldn't get to it. I also replaced the steering tie rod and the idler arm bushing. After bleeding the servo pump, the steering is still very stiff. It's a little easier to steer when you rev it while you're rolling forward. Does anyone have any idea what could be causing this?

Thanks!

 

[emerydc8]

When you took the pump apart did you make sure you reinstalled the tiny paddle wheels with the rounded sides facing the outside and square (sharp) sides facing the shaft? If they are installed backwards this will affect your power assist.

IIRC bleeding requires ten turns lock-to-lock (left/right/left) with the engine running.

 

[Nickelager]

Yes i have installed the paddle wheels correctly. I have also turned lock to lock several times during the bleeding. Can the steering box cause any of this problem or is the problem the steering pump? I have checked for any leaks, but can’t find any.

 

[daantjie]

Not sure if this will mean anything but did you also remove and clean the pressure relief valve?

 

[Nickelager]

I guess it’s the one holding the spring in the center of the steering pumping , the one with the smal filter nut. Then yes i clean that too.

 

[emerydc8]

Hi!
After the pressure hose between the servo reservoir and the pump burst, I took the pump apart and resealed it.

Are you referring to the short hose under the reservoir? That’s just a supply line that leaks on every one of our cars at some point—it’s not a pressure line. It sounds like you may have something more going on here, maybe a block somewhere in the system. What led to the line bursting? Was it operating okay before this? Pics?

 

[Nickelager]

Ok thanks for the clarification. The short hose had broken so the power steering oil leaked out and the pump ran dry for about 5 minutes. When i took it apart i noticed that it was wrong kind of line, it was a cooling line. So someone have changed that one earlier. The steering has been working before while driving, but sometimes when driving slowly and turning the steering could become really sluggish. I also get the feeling that there is something blocking the system. I think I'm going to try remove all the lines and blow them with compressed air.

 

[Nickelager]

 

[emerydc8]

That short hose is really crimped and I would think it would restrict the flow of fluid from the reservoir. This is a special house sold by the meter. Here’s a HOW-TO on replacing that hose. It looks like the price actually dropped over the years.

https://www.mbpartsource.com/search?search_str=0069970982

Thread 'HOW-TO: Reseal Power Steering Fluid Reservoir and Replace Short 15mm Hose'
HOW-TO: Reseal Power Steering Fluid Reservoir and Replace Short 15mm Hose | "HOW-TO" Tutorial Articles

 

[Nickelager]

That picture was before I took down the pump. Now its set up with a new OE hose.

 

[emerydc8]

Aside from a system blockage or malfunctioning control valve I’m out of ideas. Maybe swap it out with a used pump to rule out a bad pump.

 

[Nickelager]

What is the control valve?

 

[Nickelager]

Are you meaning this one?

 

[Nickelager]

 

[Nickelager]

I can't get the power steering sorted out. I’ve taken the power steering pump apart several times now. I’ve verified that fluid is flowing through the reservoir and out to the steering box when the steering wheel is under load. Could it be that the pump isn't generating enough pressure? Is it possible to measure the pressure going to the steering box?

 

[Nickelager]

 

[emerydc8]

Check 46-3070 and 46-0238 (control valve) under steering system in this link. Maybe it will help. https://www.500eboard.co/forums/threads/mb-w124-service-manual-cd.2360/

 

[Nickelager]

Check 46-3070 and 46-0238 (control valve) under steering system in this link. Maybe it will help. https://www.500eboard.co/forums/threads/mb-w124-service-manual-cd.2360/

I can’t open the link, it says that i haven’t the permission.

 

[emerydc8]

Oh, sorry about that. I see you need to be a member for a certain time period. Maybe someone else has an external link to the repair manual.

 

[Nickelager]

This one?

 

[gsxr]

Try this link for the FSM:

Model 124 Maintenance Manual Index

 

[SVH]

Hi Dave!!! Hope all is well! -Steve