Remove/install front axle

AR33.10-P-0100RR

Remove/install front axle

11.12.2018

Model

452.3/4

1

Nuts

2

Coolant hoses

3

Refrigerant line (with code (I01) Air conditioning Plus)

4

Screw

5

Line

6

Bracket

8

Front axle carrier

16

Refrigerant line (with code (I01) Air conditioning Plus)

17

Bracket

L6/1

Left front rpm sensor

L6/2

Right front rpm sensor

7

Holding device

9

Bolts

10

Nut

11

Steering column

12

Rack-and-pinion steering

13

Cam bolt

14

Nut

15

Rebound buffer

19

Holding device

20

Open end wrench

21

Shock absorber



Remove

 Danger

Risk of explosion caused by welding or soldering work on closed air conditioning system. Risk of poisoning caused by inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with liquid refrigerant.

Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated areas. Carry out repair work on the air conditioning system circuit only after the system has been drained.

AS83.00-Z-0001-01A

Topical note

Notes on bolted connections with self tapping screws

AH00.00-P-0007-01SF

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Procedure for a damaged or leaky air conditioning system

AH83.30-N-0004-01A

Topical note

Protect air conditioning circuit and components from moisture when carrying out repair work

AH83.30-N-0005-01A

Notes on handling refrigerant R134a

AH83.30-N-0003-01A

1

Remove battery

AR54.10-P-0005RR

2

Remove underfloor paneling

AR61.30-P-1001RR

3

Unscrew nuts (1) from bracket of ESP hydraulic unit and detach bracket of ESP hydraulic unit from front axle carrier (8)

4

Lower vehicle with lifting platform

5

Drain air conditioning system

On vehicles with code I01 (Air conditioning Plus)

AR83.30-P-1760RR

6

Drain coolant

AR20.00-P-1142RR

7

Remove coolant hoses (2)

8

Detach refrigerant line (3)

On vehicles with code I01 (Air conditioning Plus)

9

Detach refrigerant line (16) from condenser

On vehicles with code I01 (Air conditioning Plus)

10

Remove front wheels

AR40.10-P-1100RR

11

Remove screws (4) and pull left front rpm sensor (L6/1) and right front rpm sensor (L6/2) out of corresponding steering knuckle

12

Release line (5) of left front rpm sensor (L6/1) and of right front rpm sensor (L6/2) from corresponding bracket (6)

13

Detach left and right brake caliper and fasten to a suitable point with brake hose connected

Remove/install front axle brake caliper

AR42.10-P-0070RR


Do not kink the brake hose and do not leave the brake caliper hanging freely,
otherwise the brake hose could be damaged.

 Do not open the hydraulic circuit of the brake system.

14

Lower vehicle with lifting platform

15

Turn steering to center position and block steering wheel with holding device (7)


If the steering is not in the center position,
the fanfare horns and airbag clock spring contact could be damaged.

 Retainer device

*129589012100

16

Lift vehicle on vehicle lift

17

Support front axle carrier (8) using transmission jack and removal fixture, secure and remove screws (9) on left and right sides of front axle carrier (8)

 Removal fixture

*450589026200

18

Unscrew nut (10) at connection of steering column (11) with rack-and-pinion steering (12) and remove cam bolt (13)


Only the cam bolt (13) and nut (10) approved for model 452 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 (10) has been slackened, the cam bolt (13) rotates with it approx. half a revolution. However, it is not necessary to counterhold the cam bolt (13).

19

Lower front axle carrier (8) with transmission jack

 Removal fixture

*450589026200

20

Lower vehicle with vehicle lift until front axle carrier (8) makes contact with body

21

Unscrew nut (14) on left and right rebound buffer (15)


Only the nut (14) may be turned. The piston rod must be counterheld,
otherwise the shock absorber (21) will be damaged.

 If the nut (14) is jammed, push back the boot on the shock absorber (21) and fit the holding device (19) on the piston rod of the shock absorber (21). Counterhold the holding device (19) with the open-end wrench (20) and unscrew the nut (14) on the rebound buffer (15).

 Range of tools for stabilizer bar assembly

*450589001700

 Holding fixture

*451589006300

 Open end wrench

*450589010100

22

Remove left and right rebound buffer (15)

23

Unhook refrigerant line (16) from bracket (17)

On vehicles with code I01 (Air conditioning Plus)

24

Carefully lift vehicle with vehicle lift and guide front axle out from under the vehicle

 On vehicles with code (I01) Air conditioning Plus, the refrigerant line (16) must be guided past when lowering the front axle.



Install

25

Lift and position front axle using transmission jack

 On vehicles with code (I01) Air conditioning Plus, the refrigerant line (16) must be guided past when positioning the front axle.

 Removal fixture

*450589026200

26

Screw in screws (9) on left and right sides of front axle carrier (8) up to stop

27

Push front axle carrier (8) forwards, align centrally in this position and tighten screws (9) on left and right sides of front axle carrier (8)

 Bolt, front-axle carrier to body

*BA33.10-P-1001-01D

28

Install left and right rebound buffer (15), counterhold shock absorber (21) and tighten nuts (14)

Model 452.3/4,


Replace self-locking nut (14).

 Bolt, fastening shackle of shock-absorber strut to swivel bearing

*BA32.25-P-1003-04F

 Range of tools for stabilizer bar assembly

*450589001700

29

Connect rack-and-pinion steering (12) with steering column (11)

AR46.20-P-0600-01RR


Replace self-locking nut (10) and cam bolt (13).
Only the cam bolt (13) and nut (10) approved for model 452 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.

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

*BA46.10-P-1001-01F

 Retainer device

*129589012100

30

Install left and right brake caliper

AR42.10-P-0070RR


Do not kink the brake hose,
otherwise the brake hose could be damaged.

 It is not necessary to bleed the brake system.

31

Insert left front rpm sensor (L6/1) and right front rpm sensor (L6/2) into corresponding steering knuckles and tighten screws (4)

 Remove fouling on left front rpm sensor (L6/1) and right front rpm sensor (L6/2).

 Bolt, wheel speed sensor to steering knuckle

*BA42.30-P-1001-01D

32

Clip line (5) of left front rpm sensor (L6/1) and of right front rpm sensor (L6/2) into corresponding bracket (6)

33

Attach refrigerant line (16) to condenser

On vehicles with code I01 (Air conditioning Plus)

 Lines to condenser

*BA83.30-P-1004-01E

34

Attach refrigerant line (3)

On vehicles with code I01 (Air conditioning Plus)

 Nut on expansion valve

*BA83.30-P-1001-01E

35

Attach coolant hoses (2)

36

Mount front wheels

AR40.10-P-1100RR

37

Lower vehicle with lifting platform

38

Position bracket of ESP hydraulic unit on front axle carrier (8) and screw on nuts (1)

39

Install battery

AR54.10-P-0005RR

40

Evacuate and fill air conditioning system

On vehicles with code I01 (Air conditioning Plus)

AR83.30-P-1760RR

41

Pour in coolant

AR20.00-P-1142RR

42

Perform wheel alignment check

AR40.20-P-0200RR

43

Install underbody paneling

AR61.30-P-1001RR

44

Check brake system for leaks

AR42.10-P-0100-01RR

 Shock-absorber struts

Number

Designation

Model 452.3/4

BA32.25-P-1003-04F

Bolt, fastening shackle of shock-absorber strut to swivel bearing

Nm

–

 Front axle carrier

Number

Designation

Model 452.3/4

BA33.10-P-1001-01D

Bolt, front-axle carrier to body

Nm

85

 Front axle rpm sensor

Number

Designation

Model 452.3/4

BA42.30-P-1001-01D

Bolt, wheel speed sensor to steering knuckle

Nm

8

 Steering shaft

Number

Designation

Model 452.3/4

BA46.10-P-1001-01F

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

Nm

27

 Air conditioning

Number

Designation

Model 452.3/4

BA83.30-P-1001-01E

Nut on expansion valve

Nm

10

 Air conditioning

Number

Designation

Model 452.3/4

BA83.30-P-1004-01E

Lines to condenser

Nm

10