Remove/install steering knuckle

AR35.50-G-0400A

Remove/install steering knuckle

21.07.2017

Model

000.069 with rear axle 749.306/307/308/309

Shown on trailer axle with horizontal steering knuckle arm at bottom front (old version)

3

Tie rod

10

Sealing ring

16

Lower steering knuckle bearing

5

Screw

11

Clamp nut

17

Sealing ring

6

Top cover

12

Steering knuckle

18

Thrust plate

7

Screw

13

Kingpin

19

Sealing ring

8

Lower cover

14

Upper thrust plate

9

Seal

15

Upper steering knuckle bearing

Shown on trailer axle with horizontal steering knuckle arm at top rear (new version)

3

Tie rod

10

Sealing ring

16

Lower steering knuckle bearing

5

Screw

11

Clamp nut

17

Sealing ring

6

Top cover

12

Steering knuckle

18

Thrust plate

7

Screw

13

Kingpin

19

Sealing ring

8

Lower cover

14

Upper thrust plate

9

Seal

15

Upper steering knuckle bearing

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A



Remove

1

Remove respective wheel

AR40.10-G-1100K

2

Remove each tie rod (3) from steering knuckle arm

AR35.50-G-0300A

3

Remove top cap (6)

 To do this, remove the bolts (5).

4

Remove lower cap (8)

 To do this, remove bolts (7).

5

Release clamp nut (11)

 To do so, release safety screw of clamp nut (11), release clamp nut (11) far enough until it is flush with the upper edge of the thread on the kingpin (13).

6

Tight safety screw of clamp nut (11) finger-tight

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

7

Knock out kingpin (13) until clamp nut (11) makes contact with steering knuckle


Use brass hammer.
This helps to prevent any damage to the kingpin (13).

If the kingpin (13) cannot be knocked out:



Heat axle beam end and, where applicable, steering knuckle (12) in area of kingpin (13) and knock out kingpin (13).

8

Unscrew clamp nut (11)

 To do so, release safety screw of clamp nut (11). Secure the kingpin (13) against falling down.

9

Remove steering knuckle (12)

 To do so, release top thrust plate (14) first and then remove the thrust plate (18), then pull out the kingpin (13). Do not turn the steering stop screw.

10

Remove lubricating nipple from steering knuckle (12)

11

Remove upper steering knuckle bearing (15) and lower steering knuckle bearing (16)

AR35.50-G-0400-01A

 Commercially available tools
- Workshop press



Clean

12

Clean steering knuckle (12)

 It is particularly important to ensure that the bearings and the lubricating nipple bores are cleaned properly.



Install

13

Install upper steering knuckle bearing (15) and lower steering knuckle bearing (16)

AR35.50-G-0400-01A

 Commercially available tools
- Workshop press

14

Screw lubricating nipple into steering knuckle (12)

15

Install sealing rings (17, 19) in steering knuckle (12)

16

Install steering knuckle (12) into axle beam end

 To do so, before mounting the steering knuckle (12) grease the area of the steering knuckle bearing.
Knock in kingpin (13) from below by applying light hammer blows while simultaneously screwing on clamp nut (11) until finger-tight so that thrust plate (18) and upper thrust plate (14) can then be installed.

MB multipurpose grease, 5 kg

*BR00.45-Z-1034-06A

17

Unscrew clamp nut (11)

18

Install thrust plate (18) and upper thrust plate (14)

 Grease the upper thrust plate (14) completely before installing.

MB multipurpose grease, 5 kg

*BR00.45-Z-1034-06A

19

Screw on clamp nut (11)

20

Adjust bearing play at steering knuckle (12)


The bearing should be free of play and it must be possible to move the bearing easily, otherwise the procedure must be repeated.
This prevents damage.

 To do so, tighten clamp nut (11) until bearing becomes sluggish. Release clamp nut (11) 1/3 to 1/4 turn and tighten safety screw of clamp nut (11).

 Safety screw for clamp nut to kingpin

*BA35.50-N-1010-03B

21

Install lower cap (8)

 Replace seal (9), mount lower cap (8) and screw in bolts (7).

 Bolts, lower cover to kingpin

*BA35.50-N-1008-03B

22

Install top cap (6)

 Replace sealing ring (10), mount top cap (6) and screw in bolts (5).

 Bolts, upper cover to kingpin

*BA35.50-N-1007-03B

23

Attach tie rod (3) to steering knuckle arm

AR35.50-G-0300A

24

Lubricate steering knuckle (12)



Lubrication points

AP00.20-G-0020LA

25

Fit each wheel

AR40.10-G-1100K



Measure

26

Check toe, correct if necessary



Trailing-steering axle - check toe

AP40.20-G-4065LA

 Steering axle

Number

Designation

REAR AXLE 749.306/307/308/309

BA35.50-N-1007-03B

Bolts, upper cover to kingpin

M81.5

Nm

20

 Steering axle

Number

Designation

REAR AXLE 749.306/307/308/309

BA35.50-N-1008-03B

Bolts, lower cover to kingpin

M101.5

Nm

40

 Steering axle

Number

Designation

REAR AXLE 749.306/307/308/309

BA35.50-N-1010-03B

Safety screw for clamp nut to kingpin

M101.5

Nm

40

Repair materials

Number

Designation

Order number

BR00.45-Z-1034-06A

MB multipurpose grease, 5 kg

A 001 989 34 51 10