Mercedes-Benz W211 E-Class Power Steering Pump Replacement

One of the major accessories that run off of the accessory drive belt is the power steering pump. The power steering pump is unique on your vehicle because, of all the components in the car, the power steering pump produces the most pressure of any system. It is not unusual for a power steering pump to produce 1,000 to 2,000 psi while under load from the vehicle turning.

The power steering pump pressurizes hydraulic fluid to provide assist to the driver, when turning the steering wheel. The pressurized fluid travels from the pump to the power steering rack, then through two lines to each side of a piston in the steering rack. When the driver moves the steering wheel to one side to turn, the hydraulic pressure helps to push the rack in the direction desired.

When a power steering pump begins to fail, it will emit a groan when steering from side to side or you will notice increased steering effort. Of course, the pump could leak also, but a noisy weak pump is most common. If you loose function of your power steering or it takes a greatly increased effort to steer your vehicle, remove the drive belt and inspect the power steering pump shaft. If you can slide the pulley out of the power steering pump, the shaft is broken. You will have to replace the power steering pump.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. 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.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

In this article, I'll go over the steps involved with replacing and bleeding the power steering pump.

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Time: 4 hours
Tab: $300
Tools: Set of sockets :https://www.pelicanparts.com/Mercedes... E10, E12, 7mm, wrenches 22mm, :https://www.pelicanparts.com/Mercedes..., screwdrivers :https://www.pelicanparts.com/Mercedes...
Parts Required: Power steering pump :https://www.pelicanparts.com/cgi-bin/..., power steering fluid :https://www.pelicanparts.com/cgi-bin/..., power steering hose clamp, serpentine belts :https://www.pelicanparts.com/cgi-bin/..., high-pressure line copper sealing gaskets
Hot Tip: Work with a cool engine
Performance Gain: Quite power steering pump, remedy power steering leaks
Complementary Modification: Change power steering fluid reservoir
Applicable Models:
Mercedes-Benz E320 (2003-09)
Mercedes-Benz E500 (2003-06)
Mercedes-Benz E55 AMG (2003-06) :https://www.pelicanparts.com/catalog/...