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How do you replace 1995 Mercedes s420 power steering pump?

Replacing the power steering pump in a 1995 Mercedes S420 requires specific tools and adherence to safety precautions. Follow these steps to complete this task:

Necessary Tools:

- Socket wrench set

- Flathead screwdriver

- Safety glasses

- Pliers

- Drain pan

- Jack and jack stands

- Replacement power steering pump

- Power steering fluid

- Funnel

- Rags

Safety Precautions:

- Work in a well-ventilated area.

- Allow the engine to cool down before starting the repair.

- Ensure parking the vehicle on a level surface and engaging the parking brake.

- Wear appropriate clothing, including gloves and eye protection.

Step-by-Step Guide:

1. Preparation:

- Raise the vehicle using jack stands.

- Locate the power steering reservoir; it's usually marked "PS" or "ATF."

2. Draining the Power Steering Fluid:

- Place a drain pan under the power steering reservoir.

- Loosen the drain plug at the bottom of the reservoir and let the fluid drain.

3. Disconnecting the Steering Column:

- Remove the steering wheel cover (might require a special tool).

- Use a flathead screwdriver to pry off the cover over the steering column U-joint.

- Disconnect the U-joint from the power steering column assembly.

4. Removing the Old Power Steering Pump:

- Using the socket wrench set, loosen the bolts securing the power steering pump.

- Remove the serpentine drive belt by slipping it off its pulleys; use pliers if necessary.

- Disconnect the power steering hoses from the pump.

- Take out the old power steering pump by lifting and wiggling it out.

5. Installing the New Power Steering Pump:

- Position the new power steering pump in its place and loosely attach the mounting bolts.

- Connect the power steering hoses.

- Install the serpentine drive belt by slipping it back onto the pulleys.

- Tighten the mounting bolts of the power steering pump firmly.

6. Refilling Power Steering Fluid:

- Locate the power steering fluid reservoir again.

- Use a funnel to add the recommended amount of power steering fluid.

7. Testing the Power Steering:

- Lower the vehicle back to the ground.

- Start the engine and test the power steering by turning the steering wheel in both directions.

- Check for any leaks and ensure smooth steering operation.

8. Final Check:

- Check the fluid level in the reservoir.

- Replace the steering column cover and steering wheel cover.

Remember, if you're not confident in performing this repair independently or lack the necessary tools, it's advisable to seek assistance from a qualified mechanic to avoid potential issues or safety risks.