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Power Steering Fluid Reservoir Replacement
 
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Pelican Technical Article:

Power Steering Fluid Reservoir Replacement

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$25

Talent:

**

Tools:

10mm deep socket, pick, T10 Torx socket with long extension and ratchet. 10mm wrench

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Power steering fluid reservoir, filter, O-ring and gasket

Hot Tip:

Use a suction pump to remove fluid

Performance Gain:

Better steering response

When your engine is running your power steering system uses hydraulic pressure to help you turn the wheel and steer the car.. A power steering pump creates the pressure in the power steering system. A reservoir holds the power steering fluid and supplies it to the pump. From the pump it goes to the power steering gear and a return line brings it back to the reservoir. If this reservoir starts leaking you could easily run out of fluid and the steering would be harder to turn. Also there is a serviceable filter in the power steering reservoir. If this gets clogged then the pump may starve for fluid. This would result in weak power steering and a shuddering of the steering wheel as you turn. In this tech article we will go over all the steps to remove and service your power steering fluid reservoir.

Begin by uses a turkey baster or fluid pump and suctioning out as much of the fluid you can from the reservoir.

This photo illustrates the front of the left side cylinder head looking at the power steering fluid reservoir.
Figure 1

This photo illustrates the front of the left side cylinder head looking at the power steering fluid reservoir. Remove the rubber lock nut (green arrow) that holds on the power steering fluid reservoir cover.

Remove the power steering fluid reservoir cover by pulling up on it.
Figure 2

Remove the power steering fluid reservoir cover by pulling up on it.

Figure 3

With a deep socket remove the 10mm fastener (green arrow)

Remove the power steering fluid reservoir filter spacer.
Figure 4

Remove the power steering fluid reservoir filter spacer.

Remove the power steering fluid reservoir spring.
Figure 5

Remove the power steering fluid reservoir spring.

With a right angle pick hook it in the filter holes and pull the filter out.
Figure 6

With a right angle pick hook it in the filter holes and pull the filter out.

Remove the four T10 Torx fasteners (green arrows).
Figure 7

Remove the four T10 Torx fasteners (green arrows).

At the back of the reservoir remove the two 10mm fasteners that hold the return tube onto the reservoir.
Figure 8

At the back of the reservoir remove the two 10mm fasteners that hold the return tube onto the reservoir. The plastic spark plug wire housing may be in the way of getting the top fastener all the way out but you can flex it out of the way.

Pull the return hose out of the power steering fluid reservoir by moving back towards the engine.
Figure 9

Pull the return hose out of the power steering fluid reservoir by moving back towards the engine. There is an O-ring (green arrow) on the return hose that you can use a pick to remove and replace it.

Pull up on the reservoir and separate it from the housing bracket.
Figure 10

Pull up on the reservoir and separate it from the housing bracket. You can now see the gasket (green arrow). Remove this gasket and replace it with a new one. Installation is the reverse of the removal steps. With a new gasket in place bolt the power steering fluid reservoir down. Fit the return line at the back of the power steering fluid reservoir and tighten down the fasteners. Install the filter, then spring, then spacer, then mounting fastener and tighten. Add power steering fluid and fit the cover. Start the engine and turn the steering wheel from lock to lock to allow air to be purged from the system. You may have to do this for several minutes pausing a few minutes to allow the air to escape from the fluid. Repeat until the pump whine is reduced and fit the cover retaining fastener. Top up fluid as needed as air is purged from the system

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Page last updated: Fri 12/9/2016 02:27:57 AM