Mercedes 126 repair – forgotten liquids, II

The Mercedes 126 Repair: Forgotten Liquids, Part I we looked at the rear differential. Now, let's turn our attention to another fluid that most owners never change: power steering fluid.


Most Mercedes 126 owners will never separate the wheel steering steering wheel. But those who have achieved new results in the importance of pure fluid in the steering wheel. In addition to the main screwdriver assembly and the contact surface between the ball nut and the actual rotation speed of the Pitman, there are several needle bearings. All these moving parts are lubricated by a uniform flow of power steering fluid. The stronger the fluid is contaminated, the faster these parts will be. And the worn steering wheel means sloppy steering, potential safety risks, and expensive repair or replacement. (The power steering pump, on the other hand, is much easier to replace and well-used units can be purchased for up to $ 50.)

There was a dispute with the Automatic Transmission Fluid (ATF) in this system. Despite the fact that the ATF was given in the owner's manual, the ATF is not what it was and was somewhat hostile to many gaskets in the steering system. Ideally, the ATF must be disconnected from the smooth, old power steering fluid. While synthetic liquids are available, conventional fluids are perfectly fine.

To replace the fluid, support the front part of the vehicle on the sockets so that both front wheels descend from the ground. Remove the hose clamp that secures the return hose with the "pump" retractor screwed in the pump and direct the hose to a suitable container to catch the old fluid. Insert the breathing tube or loosen it with a 19 mm wrench and turn it up to fill the tank without losing fluid from the return valve. The usual procedure here is to start the engine and add the fluid while the pump quickly displaces the old fluid. But this process involves some major disadvantages. Most is a one-man operation. The flow rate is so fast that there is a high risk that the pump will leak dry and breathe, unless the new fluid is evenly dispensed. If things went out, you need help to stop the engine immediately. If you do not have the help and do not want to risk damaging the pump or you must not drive air to the system, you need a better method.

Fortunately, it is perfectly possible to pump the old fluid into a heavily controlled one by simply rotating the steering wheel from stopping to stopping. Keep the fluid level in the tank over the filter to prevent air from entering and continue until you are sure that the liquid leaving the recirculation hose is clean. You need 2-3 km to fully charge the liquid, but if you try to remove all the traces of the (red) ATF, you'll find a little more to get into a completely clean container. When you are happy, reconnect the return hose and thoroughly blow the system by turning the steering wheel forward and backward with the engine running.

This is of course a perfect option to change the filter pump and the rubber hose hoses, if necessary. The fact that Mercedes gives us a filter in the power steering pumps tells us something about the importance of pure fluid. How many other car makers do this?

Source by Richard M Foster

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