Remove/install power steering electric motor

AR46.35-P-1002MCC

Remove/install power steering electric motor

4.5.15

Model

451.3/4

with code V26 (Power steering, EPS (FFO))

Shown on model 451.30

1

Rack-and-pinion steering

2

Steering coupling

3

Nut

4

Screw

5

Front axle carrier

6

Bolts

B23x1

Power steering torque sensor connector

M19x1

Power steering connector

W30/2

Ground; power steering pump noise suppression

Shown on model 451.30

1

Rack-and-pinion steering

10

Cable tie

11

Electrical line

12

Screw

13

Contact lug

14

Sealing ring

M19

Power steering motor

 

Remove/install



Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 Danger !

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

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

AS00.00-Z-0010-01A

1

Raise vehicle with vehicle lift

2

Remove underfloor panels

3

Remove front bulkhead

Model 451.3 (except 451.39), 451.4 (except 451.49)
with code V26 (Power steering, EPS (FFO))

 The front bulkhead is attached with two nuts.

4

Loosen nut (3) on steering coupling (2)


Do not unscrew nut (3) completely.
Otherwise, the bolt (4) could fall out and the steering coupling (2) could disconnect, thus damaging the fanfare horns and airbag clock spring contact while setting the front wheels to a straight-ahead position.

 Turn the front wheels until the nut (3) is accessible.

 Screw/bolt, steering coupling to rack-and-pinion steering

*BA46.10-P-1001-01F

5

Lower vehicle with vehicle lift

6

Place the front wheels in the straight-ahead position and block the steering wheel using the holding device


Lock steering wheel.
Otherwise the fanfare horns and airbag clock spring contact may be damaged.

 Retainer device

*129589012100

7

Raise vehicle using the vehicle lift and secure in place

AR00.60-P-0100MCC

8

Unscrew nut (3) on the steering coupling (2), remove bolt (4) and slide steering coupling (2) upwards off the rack-and-pinion steering (1)


Replace nut (3) and bolt (4). Only the bolt (4) and nut (3) approved for model 451 may be used.
Bolts and nuts of other models with the same dimensions have different properties due to other surface coatings and may impair the strength of the bolted connection.

 When the nut (3) is loosened, the cam-shaped bolt (4) rotates with it approx. half a revolution. However, the bolt (4) does not have to be counterheld.

 Installation: Check the steering coupling (2) for ease of movement and replace if necessary.

9

Disconnect connector of power steering torque sensor (B23x1)

10

Disconnect power steering connector (M19x1)

11

Ground; disconnect interference suppression of power steering pump (W30/2)

12

Remove front axle carrier support

Model 451.390/392/490/492
with code V26 (Power steering, EPS (FFO))

AR33.10-P-0002MEX

Model 451.391/491
with code V26 (Power steering, EPS (FFO))

AR33.10-P-0002MEV

 Remove front axle carrier support only for front axle carrier (5).

13

Support front axle carrier (5) using telescopic lifter and removal fixture



000 588 11 62 00 Major assembly mount

WS01.00-P-0092B

 Removal fixture

*450589026200

14

Remove screws/bolts (6) on front axle carrier (5)



000 588 11 62 00 Major assembly mount

WS01.00-P-0092B

 Installation: Screw in the screws/bolts (6) and remove the telescopic lifter with removal fixture.
Slide front axle carrier (5) into the foremost position and align centrally in this position, then tighten screws/bolts (6).

 Bolt, front-axle carrier to body

*BA33.10-P-1001-01D

 Removal fixture

*450589026200

15

Lower front axle carrier (5) carefully using telescopic lifter until power steering motor (M19) is accessible

16

Remove cable ties (10) and place electrical line (11) to one side

 Observe routing of electrical line (11).

 Installation: Replace cable tie (10).

17

Remove bolts (12) on power steering motor (M19)

 Observe installation position of contact lug (13).

 Bolt, electric motor to rack-and-pinion steering

*BA46.20-P-1005-01G

18

Remove power steering motor (M19) from rack-and-pinion steering (1)

 Ensure that no dirt reaches the power steering motor (M19) and the rack-and-pinion steering (1). Check seal ring (14) for condition and seat.

 Installation: To facilitate assembly of the power steering motor (M19) grease the seal ring (14) lightly.

Syntheso GLK 1 grease

*BR00.45-Z-1059-06A

19

Install in the reverse order

20

Perform wheel alignment check

Model 451.3/4
with code V26 (Power steering, EPS (FFO))without recording the vehicle level

AR40.20-P-0200MCC

Model 451.3/4
with code V26 (Power steering, EPS (FFO))with recording the vehicle level

AR40.20-P-0200MCE

 Depending on the workshop equipment select between the measurement variant with recording the vehicle level or without recording the vehicle level.

 Front axle carrier

Number

Designation

MODEL 451.30/33/380/40/ 43/480

Model 451.390/392/490/492

BA33.10-P-1001-01D

Bolt, front-axle carrier to body

Nm

100

85

 Front axle carrier

Number

Designation

Model 451.391/491

BA33.10-P-1001-01D

Bolt, front-axle carrier to body

Nm

100

 Steering shaft

Number

Designation

Model 451.3/4

BA46.10-P-1001-01F

Screw/bolt, steering coupling to rack-and-pinion steering

Nm

20

 Steering gear

Number

Designation

Model 451.3/4

BA46.20-P-1005-01G

Bolt, electric motor to rack-and-pinion steering

Nm

25

Repair materials

Number

Designation

Order number

BR00.45-Z-1059-06A

Syntheso GLK 1 grease

Q0012978V000000000