Remove/install rack-and-pinion steering

AR46.20-P-0600RT

Remove/install rack-and-pinion steering

17.6.11

14.4.08

Detach lower engine compartment paneling, added

Step 5.1

AR61.20-P-1105RT

Remove bottom section of soundproofing, added

Step 5.2

AR94.30-P-5300RT

 

Remove/install

 Danger!

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.

AS00.00-Z-0010-01A

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

 Danger!

Risk of injury to skin or eyes caused by hydraulic fluid spraying out under high pressure. Risk of poisoning caused by swallowing hydraulic fluid

Depressurize hydraulic system completely before starting any work on system. Wear protective clothing and safety glasses.

AS00.00-Z-0013-01A



Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

1

Deactivate easy entry/exit function

 Vehicles with code (275) memory package (driver seat, steering column, mirrors).

 Otherwise the driver seat and steering wheel move to a different position, e.g. when the driver door is opened/closed. The upper frame may be damaged when the holding device is installed.

 It is switched off using the buttons on the steering wheel in the "Comfort" menu on the multifunction display, see vehicle owner's manual.

2

Remove partition wall between wheel wells

 Engine 642 only.

AR62.30-P-2400RT

3

Remove engine trim panel

 Engine 642 only.

4

Extract oil from expansion reservoir of power steering pump

 Hand pump

*210589007100

5.1

Detach lower engine compartment paneling

 Vehicles with gasoline engine.

AR61.20-P-1105RT

5.2

Remove bottom section of soundproofing

 Vehicles with diesel engine.

AR94.30-P-5300RT

6

Remove tie rod

AR46.40-P-0200RT

7

Unplug electrical connector (5) from control valve of rack-and-pinion steering (1)

8

Remove lower bolt of steering coupling (4) on the rack-and-pinion steering (1)

 To do so, turn steering coupling to appropriate position and then turn it back to its original position.



*BA46.10-P-1002-01K

9

Turn steering wheel to central position (front wheels in straight ahead position) and secure with the retaining device

 The steering wheel must not be turned when the steering coupling is detached, otherwise the clock spring contact will be destroyed.

 Holding device

*129589012100

10

Push steering coupling together and carefully pull it out of rack-and-pinion steering (1)

 Installation: Turn rack-and-pinion steering into center position and mount steering coupling.

AR46.20-P-0600-01RT

 Do not use force (hammer impact, strong lever action).

11

Remove bolt securing retaining plate (3) for oil lines

from rack-and-pinion steering (1) and pull out oil lines

 Seal off line connections with plugs.

 Installation: replace O-rings.



*BA46.20-P-1002-01L

 Set of stop plugs

*129589009100

12

Remove front axle gear

 Vehicles with 4MATIC.

AR33.30-P-0525RT

13

Detach retaining plate from rack-and-pinion steering (1) and retaining plate on front axle carrier (2); to do this, remove bolts



*BA46.20-P-1001-01L



*BA46.20-P-1003-01L

14

Swing rack-and-pinion steering (1) down and out between front axle carrier

 Installation: The bolts, nuts as well as the contact surfaces of the retaining plate and front axle carrier must be free from oil, grease and preservation agent. Heating causes the lubricants to melt and spread, which may cause the bolted connections to work loose.

15

Check rubber mounts of rack-and-pinion steering mounting for damage

16

Install in the reverse order

17

Fill power steering pump and bleed

AR46.30-P-0010RT

18

Check steering for function and leaks

19

Perform wheel alignment check

 After installation of new parts.

AR40.20-P-0200RT

Number

Designation

Model 251

BA46.10-P-1002-01K

Bolt, steering coupling to rack-and-pinion steering

Nm

33

Number

Designation

Model 251

BA46.20-P-1001-01L

Bolted connection, rack-and-pinion steering to front axle carrier

Stage 1

Nm

50

Stage 2

°

-180

Stage 3

Nm

50

Stage 4

°

90

BA46.20-P-1002-01L

Screw/bolt, oil line retaining plate to control head

Nm

18

BA46.20-P-1003-01L

Bolted connection, supporting plate to front axle carrier

Nm

32