Special tools required:

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13 5 020
37 1 151
37 1 152

WARNING: Danger of poisoning if oil is ingested/absorbed through the skin! See 00 DANGER OF POISONING IF OIL IS INGESTED/ABSORBED THROUGH THE SKIN
Risk of injury if oil comes into contact with eyes and skin! See 00 RISK OF INJURY IF OIL COMES INTO CONTACT WITH EYES AND SKIN

IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.

NOTE: In a warranty case you must always provide a fault memory printout, even where there is no fault memory entry, with the defective part. In addition, the valve block openings must be sealed with the protective caps (of the new part).

Necessary preliminary tasks:

Draw off and dispose of hydraulic fluid from fluid reservoir
Partially remove front right wheel arch cover (rear section). See 51 71 039 REMOVING AND INSTALLING/REPLACING FRONT LEFT OR RIGHT WHEEL ARCH COVER (REAR SECTION)
Remove right underbody panelling. See 51 47 ... REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT UNDERBODY PANELLING

Removing valve block:

Disconnect plug connections (1) and expose wiring harness up to valve block.

Fig 1: Identifying Plug Connections

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Release screw pins (1), open holder and suspend hydraulic lines to one side.

Fig 2: Identifying Screw Pins

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Open holder (1) and remove control lines to rear axle oscillating motor.

Fig 3: Identifying Control Lines And Holder

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IMPORTANT: Hydraulic line and connection on valve block must be fitted with suitable sealing plugs immediately after removal!

Release hollow nuts of control lines (1, 2) to front axle oscillating motor with special tool 37 1 151.

Release hollow nuts of control lines (3, 4) to rear axle oscillating motor with special tool 37 1 151.

Release hollow nut of pressure line (5) with special tool 13 5 020.

Release hollow nut of return line (6) with special tool 37 1 152.

Fig 4: Identifying Hollow Nut Of Return Line

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Unclip wiring harness (1).

Release nuts (2) and remove valve block.

Fig 5: Identifying Wiring Harness And Nuts

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Installing valve block:

Replace self-locking nuts.

Mount valve block with nuts (2) on body.

Tightening torque 37 14 10AZ.

Secure wiring harness (1) to valve block holder.

Fig 6: Identifying Wiring Harness And Nuts

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IMPORTANT: When assembling, make sure that only the sealing plugs of the line to be fitted are removed.
Do not damage sealing surfaces of hydraulic lines.

NOTE: Make sure hydraulic lines are laid without tension and with sufficient spacing to adjoining components.

Installation sequence for hydraulic lines:

Install control lines (3, 4)
Tightening torque 35 N.m.
Install pressure line (5)
Tightening torque 35 N.m.
Install return line (6)
Tightening torque 35 N.m.
Install control lines (1, 2)
Tightening torque 35 N.m.

Fig 7: Identifying Hollow Nut Of Return Line
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Check seating and position of line holder (1), correct if necessary.

Fig 8: Identifying Line Holder

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Replace screw pins (1).

Insert hydraulic lines in holder and seal holder with screw pins (1).

Tightening torque 35 N.m.

Fig 9: Identifying Screw Pins

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Insert control lines in holder (1) and seal holder.

NOTE: Replace damaged holder.

Fig 10: Identifying Control Lines And Holder

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Connect plug connections (1) and lay wiring harness up to valve block.

Fig 11: Identifying Plug Connections

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After installation:

Fill and bleed hydraulic system. See 32 13 006 BLEEDING POWER STEERING (VERSION WITH DYNAMIC DRIVE)
Check pipe connections for leaks
Carry out initial Dynamic Drive operation. See 37 10 001 Initial Operation With Test Run of Dynamic Drive