Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Power Steering Filter and Flush
 
Bookmark and Share

Pelican Technical Article:

Power Steering Filter and Flush

Steve Vernon

Time:

1 hour1 hr

Tab:

$4 to $30

Talent:

*

Tools:

Turkey baster or fluid pump, 10mm wrench or deep socket, needle nose pliers

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Power steering filter and fluid

Hot Tip:

Don't open the lines

Performance Gain:

Sharper steering input

Complementary Modification:

Check your steering linkage

Changing out the filter on the power steering pump on a Mercedes W123 is simple and should be part of your regular maintenance. The filters are not expensive and can prevent costly damage. If your power steering fluid is over 5 years old you should consider a "flush" of the fluid as well.

If you are going to change the fluid there are two schools of thought on doing it. The first school of thought is to completely flush out the system while simultaneously adding new fluid. This involves opening the return line to the reservoir and placing a large bucket for the fluid to empty into under it while being prepared to add several liters of clean fluid into the reservoir. Have someone start the car and turn the wheel while you are pouring new fluid into the reservoir so it doesn't run dry. I do not recommend this method for a lot of reasons. First: You will use a lot of fluid. You will be shocked at how much of a volume your pump can move, and the fluid is not cheap. Second: It can get extremely messy, as everything is slippery and moving under pressure. Third: If you let your pump run dry, even for a few seconds, you can severely damage it.

I prefer the "old school" method of sucking as much fluid as you can out of the reservoir, replacing the filter and adding new fluid. Run the motor and turn the wheel a few times side to side, then turn everything off and suck out the fluid in the reservoir and fill with new fluid. Do this several times until the fluid in the pump appears clean.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Our vehicle may vary slightly from yours as Mercedes redesigned systems and sub-system as the models developed over the years. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

The steering pump, which houses the filter, is located the front left side of the engine compartment (red arrow).
Figure 1

The steering pump, which houses the filter, is located the front left side of the engine compartment (red arrow).

Clean the lid of the pump so that dirt or debris cannot fall into the fluid when you remove it and then unscrew the plastic knob on top (red arrow).
Figure 2

Clean the lid of the pump so that dirt or debris cannot fall into the fluid when you remove it and then unscrew the plastic knob on top (red arrow).

There is a plastic stock that holds the filter down and in place.
Figure 3

There is a plastic stock that holds the filter down and in place. Use a 10mm wrench or deep socket and remove the nut (red arrow).

Use care when removing the nut as there is a spring under the plastic piece.
Figure 4

Use care when removing the nut as there is a spring under the plastic piece. With the nut removed, remove the plastic piece and spring.

Remove the old filter from the housing, if you have a telescoping magnet it really comes in handy to remove the filter or you can grab the inside holes of the filter with a set of needle nose pliers.
Figure 5

Remove the old filter from the housing, if you have a telescoping magnet it really comes in handy to remove the filter or you can grab the inside holes of the filter with a set of needle nose pliers.

Use a fluid pump and remove as much fluid from the pump as possible.
Figure 6

Use a fluid pump and remove as much fluid from the pump as possible.

If you are going to change out the fluid you want to install the new filter, fill the housing with new fluid until the indicated line (red arrow) run the motor and turn the wheel a few times side to side, then turn everything off and suck out the fluid in the reservoir and fill with new fluid.
Figure 7

If you are going to change out the fluid you want to install the new filter, fill the housing with new fluid until the indicated line (red arrow) run the motor and turn the wheel a few times side to side, then turn everything off and suck out the fluid in the reservoir and fill with new fluid. Do this several times until the fluid in the pump appears clean. If you are just changing the filter drop the new one in using the reverse of removal, top up the fluid till the line shown, start the motor and turn the wheel a few times to check the level and top up as needed.

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Wed 12/7/2016 03:01:46 AM