Power steering conundrum - Mercedes Benz SLK Forum

SLK R171 General Discussion SLK 200, SLK 280, SLK 300, SLK 350, SLK 55 AMG

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#1 Old 01-10-2019
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Power steering conundrum

Anyone out there in Mercedes land suffered with heavy power steering on initial start up, it's cooler here than of late but don't think that should effect the operation of the pump. The problem disappeared after stopping and restart, just looking for suggestions.
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#2 Old 01-10-2019
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Did you check the power steering oil ( you have 2 measurements cold and hot ).
Also, you can refresh the oil in there is black, normal color is green.
https://www.slkworld.com/slk-r171-cl...id-change.html
This was on my old slk 200, same principle on slk 55
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#3 Old 01-10-2019
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Did it just happen once? There is a proportioning valve in the power steering that is supposed to control how much power assist is applied... the valve is on the steering rack, and the idea is that it reduces assist at higher speeds.
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#4 Old 01-10-2019
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It's happened twice, once about 6 months ago and then again today, where is the pump located when looking from the front of the car? Think that's first point of call to check oil.
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#5 Old 01-10-2019
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Here is a picture.
Similar car...
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File Type: jpg check-add-power-steering-fluid-mercedes-04-600x600.jpg (81.9 KB, 18 views)
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#6 Old 01-11-2019
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My SLK 200 is heavy too; PS oil level is fine. Are there any other adjustments?

In another, connected, thread, 'Sneaky Pete' wrote:
But I looked at your datacard and noticed it is lacking SPS (Speedsensitive Power Steering, option 213). The symptoms you describe are typical for what you experience when you get to drive a R171 without it. Mine's lacking it too and I immediately noticed it. Both my previous SLK's had SPS and I experienced the same symptoms you describe when I drove away with my current one that is lacking it. Might be you have to live with it. Retrofit SPS is pretty difficult I believe, if not virtually impossible. Just a heads-up, but you can give the adjustments always a try. If not, look at the bright side, free workout!!

Last edited by Bonky28; 01-11-2019 at 11:47 AM. Reason: additions
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#7 Old 01-11-2019
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Good point - I've also seen this referred to as "direct steering" option.

The intermittent nature is what led me to believe the OP has the option.
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#8 Old 01-16-2019
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Replace the power steering fluid. Usually the dealer will just top it off. Tell them you want them to go underneath the car and open the system and drain out the fluid and then have it all replaced with new. You'll notice the difference .
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#9 Old 01-26-2019
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Quote:
Originally Posted by mmitchellSLK55 View Post
Replace the power steering fluid. Usually the dealer will just top it off. Tell them you want them to go underneath the car and open the system and drain out the fluid and then have it all replaced with new. You'll notice the difference .
Thanks. How easy is it to do oneself? Where is the drain for the reservoir? Is the oil corrosive? Methinks I need to buy a Haynes Manual!

Richard
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#10 Old 01-26-2019
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No Haynes etc available


There are guides for most jobs on here.



several have access to wis and can post help

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#11 Old 01-26-2019
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Quote:
Originally Posted by Bonky28 View Post
Thanks. How easy is it to do oneself? Where is the drain for the reservoir? Is the oil corrosive? Methinks I need to buy a Haynes Manual!

Richard

No drain I'm afraid. Afaik you have to suck it out. Hydraulic oil MB spec 345.0. No idea if it's corrosive.

https://drive.google.com/open?id=1Lj...RibdXZER7u6fi-
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#12 Old 01-27-2019
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Quote:
Originally Posted by mmitchellSLK55 View Post
Replace the power steering fluid. Usually the dealer will just top it off. Tell them you want them to go underneath the car and open the system and drain out the fluid and then have it all replaced with new. You'll notice the difference .
I will be very careful with that as any air in the system will be very hard to bleed.
Just do what I did on my old slk.

https://www.slkworld.com/slk-r171-cl...id-change.html



from wis
Fill expansion reservoir (power steering) (1) 
with MB steering gear oil Do not start the engine!
If the engine is started, there is a risk of air
entering the hydraulic steering, which is then
extremely difficult to remove.
 Fill the expansion reservoir (power
steering) (1) up to approx. 10 mm below the
upper edge of the reservoir with MB steering
gear oil.
Refill with MB-steering gear oil continuously
until the oil level remains constant.

Bleeding
6 Turn steering wheel from steering stop to 
steering stop Do not start the engine!
If the engine is started, there is a risk of air
entering the hydraulic steering, which is then
extremely difficult to remove.
 Turn the steering wheel slowly from
steering stop to steering stop until no more
bubbles can be found in the expansion
reservoir (power steering) (1).
Repeat turning the steering from stop to stop
several times (up to 30 times). During this
process, MB steering gear oil must be poured
into the expansion reservoir (power steering)
(1) by a second person

Start engine without moving the steering  Allow engine to run for Approx.. 1 min. at
idle speed.
During this process, a second person must
observe the oil level in the expansion reservoir
(power steering) (1) and add MB steering gear
oil as required.
8 Turn steering wheel from steering stop to  With the engine running, turn the steering
steering stop wheel slowly several times from steering stop
to steering stop, occasionally adding MB
steering gear oil to the expansion reservoir
(power steering) (1).
Repeat the procedure until the oil level in the
expansion reservoir (power steering) (1)
remains constant and bubbles are no longer
visible.
 Check
9 Check oil level in expansion reservoir (power
steering) (

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#13 Old 01-27-2019
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Thanks everyone; food for thought there; a little more involved than I thought, but I'll give a go when the warmer weather comes!
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