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Pelican Technical Article:

Replacing the Power Steering Pump

Mike Holloway

Time:

1 hour1 hr

Tab:

$100 to $400

Talent:

**

Tools:

13mm socket, breaker bar, 17mm open end wrench, 19mm open end wrench

Applicable Models:

Mercedes-Benz 450SL (1975-80)

Parts Required:

Power steering pump

Hot Tip:

Fluid receptacle beneath car

Performance Gain:

Improved steering

Complementary Modification:

Replace power steering fluid

The power steering pump is located on the upper left side of the engine. When replacing the pump you will first need to remove the negative battery cable and keep the cable end from touching any metal surface. There is also a battery removal article to consult should you have any questions.

The two hydraulic fluid power steering lines connected to the pump, one is 17mm and the other is 19mm, will also need to be removed. Before you remove the lines make sure you get as much fluid out of the reservoir as possible. You can use a turkey baster or small hand pump to suck out as much fluid as you can. With the reservoir empty remove the two lines. Some fluid will still drain out so be ready for it. With the fluid and lines unfastened remove the three 13mm nuts and bolts holding the pump to the bracket.

Replacing the pump is the reversal of removal. Once you have reconnected the power steering line and filled the reservoir, reattach the negative battery cable but DO NOT start the car. With the ignition unlocked turn the steering wheel curb to curb 30 times. This will help purge the air from the system, failure to do this will cause air to be trapped in the system and result in a noisy and improperly working rack. Make sure you fill the reservoir to the correct level as the system is very level sensitive.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner. Coolant is poisonous and should be treated as such. Animals and small children have been known to die from ingesting coolant. If you have to jack up your car, make sure to use jack stands and chock your wheels as well as applying the parking brake. 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. Always wear eye and hand protection. Disconnect the battery before working on your car.

Loosen and remove the cover to the power steering fluid pump.
Figure 1

Loosen and remove the cover to the power steering fluid pump.

Remove the cover and check the level of fluid in the reservoir.
Figure 2

Remove the cover and check the level of fluid in the reservoir.

Using a hand pump or a turkey baster, remove as much of the power steering fluid as possible.
Figure 3

Using a hand pump or a turkey baster, remove as much of the power steering fluid as possible.

Using a 13mm socket on a breaker bar, loosen and remove the top bolt that holds the pump.
Figure 4

Using a 13mm socket on a breaker bar, loosen and remove the top bolt that holds the pump.

Using a 13mm socket on a breaker bar, loosen and remove the bottom bolt that is used to tighten the power steering belts.
Figure 5

Using a 13mm socket on a breaker bar, loosen and remove the bottom bolt that is used to tighten the power steering belts. .

Using a 13mm socket on a breaker bar, loosen and remove the bottom bolt that holds the pump.
Figure 6

Using a 13mm socket on a breaker bar, loosen and remove the bottom bolt that holds the pump.

With the pump loosened, the belts can slip off the wheels.
Figure 7

With the pump loosened, the belts can slip off the wheels.

Using a 19mm open-end wrench, loosen and remove the front line from the pump.
Figure 8

Using a 19mm open-end wrench, loosen and remove the front line from the pump.

Using a 17mm open-end wrench, loosen and remove the back line from the pump.
Figure 9

Using a 17mm open-end wrench, loosen and remove the back line from the pump.

The pump is now free and can be replaced or rebuilt.
Figure 10

The pump is now free and can be replaced or rebuilt. Replacement is the reverse of removal. Consult the articles about replacing the power steering fluid and power steering filter as needed.

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Page last updated: Thu 10/19/2017 02:51:01 AM