Disassemble/assemble suspension strut

AR32.25-S-1018E

Disassemble/assemble suspension strut

04.09.2020

Model

447, 448

except code CA4 (AIRMATIC)

Modification notes

01.07.2020

Method extended

Operation step 23

1

Suspension strut

5

Spring

2

Nut

6

End stop

3

Upper spring seat

7

Lower spring seat

4

Boot

8

Shock absorber

3

Upper spring seat

5

Spring

7

Lower spring seat

8

Shock absorber

9

Cap

10

Tensioning device

 Warning

Risk of injury caused by pinching or crushing when working on springs or spring bodies that are under tension

Use only approved tensioning devices; additionally screen off hazardous area if necessary. Check special tools for damage and proper operation (visual inspection). Wear protective gloves.

AS00.00-Z-0001-01A

Notes on shock absorber testing

AH32.25-N-0001-01A



Remove

1

Remove suspension strut (1).

AR32.25-S-1017E



Disassemble

2

Clamp tensioning device (10) into vise and insert clamping plates.

 Tensioning device

*203589013100

 Clamping plate

*203589016302

3

Insert suspension strut (1) into tensioning device (10).


The  clamping plates must be positioned such that at least three coils of the spring (5) are tensioned.
Malfunction or damage can occur otherwise.

 Clamping plate

*203589016302

4

Tension spring (5) until upper spring seat (3) is relieved.

 Tensioning device

*203589013100

5

Remove cover (9).

6

Remove nut (2).

 When doing so, counterhold piston rod of shock absorber (8).

7

Remove upper spring seat (3).


Do not separate upper spring seat(3) and pilot bearing.
Otherwise the guide bearing will be damaged.

8

Remove boot (4).

9

Remove end stop (6).

10

Remove shock absorber (8).

11

Move tensioning device (10) to removal position and remove spring (5).

When replacing springs(5).

 Only replace springs(5) in pairs.

 Tensioning device

*203589013100

12

Remove lower spring seat (7) from shock absorber (8).

13

Dispose of shock absorber (8) properly.

When replacing the shock absorber(8).



Assemble

14

Insert spring (5) into tensioning device (10) and tension spring (5).

When replacing springs(5).

 Clamping plate

*203589016302

 Tensioning device

*203589013100

15

Slide lower spring seat (7) onto shock absorber (8).

 Observe guide lugs (arrow a, arrow b) for positioning lower spring seat (7).

16

Insert shock absorber (8) into spring (5).

 Observe correct support position (arrow c) of spring (5) on lower spring seat (7).

17

Install end stop (6).

 Ensure that end stop(6) is seated correctly.

18

Install boot (4).

 Ensure correct seating of the boot(4).

19

Mount upper spring seat (3) and position relative to spring (5).

20

Attach nut (2).

 When doing so, counterhold piston rod of shock absorber (8).

 Nut, spring clamp plate to suspension strut

*BA32.25-N-1003-04C

21

Install cap (9).

22

Move tensioning device (10) into removal position.

 Tensioning device

*203589013100

23

Remove suspension strut (1) from tensioning device (10).

 Tensioning device

*203589013100

24

Remove clamping plates and remove tensioning device (10) from vise.

 Tensioning device

*203589013100

 Clamping plate

*203589016302



Install

25

Install suspension strut (1).

AR32.25-S-1017E

 Suspension struts

Number

Designation

Model 447, 448

BA32.25-N-1003-04C

Nut, spring clamp plate to suspension strut

Nm

56