Remove/install air spring

AR32.22-P-1500RFW

Remove/install air spring

23.05.2019

Model

253.992/993

Modification notes

23.05.2019

Pressure line to rear air suspension/valve unit

Model 253

BA32.22-P-1005-03G

4

Air spring

6

Spring control arm

5

Pressure line

7

Shock absorber

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Danger

Risk of explosion caused by escaping hydrogen or overheating of the fuel tanks when working on the hydrogen system. Risk of frostbite to body parts caused by escaping gas and by touching component parts carrying gas when emptying fuel tanks. Risk of asphyxiation caused by inhalation of air diluted by hydrogen. Risk of burn injuries by coming into contact with an invisible pale blue hydrogen flame.

AS00.00-Z-0030-01B

 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

Topical note

Notes on fuel cell system

AH00.00-P-0022-01RFW

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Notes on handling, transport and storage of composite brake disks

AH42.10-P-9406-12LF

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

AH00.00-P-0020-01A

Notes on level control

AH32.22-P-1001-02LWT

Notes on safety-relevant components

AH00.00-Z-0019-01A

Notes on repair work on suspension components

AH00.00-P-0100-01A

 

Remove/install

1

Ensure that the requirements for driving into the workshop are fulfilled.

Topical note

Requirements for driving into the workshop

AH00.00-P-0021-01RFW

2

Print out "tank system, fuel cell, form event log," fill out, and attach to the vehicle somewhere clearly visible.



OF00.00-P-3000-21RFW

3

Remove rear wheel.

AR40.10-P-1102A

4

Drain pressure from air spring (4) using vehicle diagnosis system.



AD00.00-P-2000-04B

5

Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).

6

Remove rear axle underfloor paneling.

AR61.30-P-1001RFW

7

Remove cover under spring link (6).

8

Remove rear fuel cell exhaust air pipe.

When removing right air spring (4).

AR49.10-P-0004RFW

9

Remove pressure line (5) from air spring (4) and seal openings using suitable stop plugs.

 Torque tool set

*003589050900

 Record plug

*129589009100

10

Remove shock absorber (7) at spring link (6) and push outward in lower area.

AR32.25-P-0110LW

11

Carefully pull air spring (4) downward by its upper plastic frame until the air spring (4) releases from the retaining clip.


Do not completely compress or extend the air spring (4).
Otherwise the air spring (4) may be damaged.

 The retaining clip is destroyed when the air spring (4) is removed.

12

Remove air spring (4) rearward.


Remove the air spring (4) carefully.
Otherwise the protective boot for the air spring (4) may be damaged.

13

Remove retaining clip.

Model 253.992/993
except code 489 (AIR BODY CONTROL)

AR32.22-P-1500-02RFW



Check

14

Check condition of air spring (4).


There must not be any intrusions on the protective boot.
Otherwise the movement of the spring will damage the spring bellows on the inside.

If problems occur,



Replace air spring (4).



Install

15

Install new retaining clip.

Model 253.992/993
except code 489 (AIR BODY CONTROL)

AR32.22-P-1500-02RFW

16

Position air spring (4) with air spring centering (arrow) at spring link (6).


Do not completely compress or extend the air spring (4).
Otherwise the air spring (4) may be damaged.

17

Position and engage air spring (4) at retaining clip.


Do not completely compress or extend the air spring (4).
Otherwise the air spring (4) may be damaged.

18

Attach shock absorber (7) to spring link (6).

AR32.25-P-0110LW

19

Remove all stop plugs.

20

Attach pressure line (5) to air spring (4).


The thread on the connection for the pressure line (5) may not be damaged.
Otherwise, leaks will occur.

 Pressure line to rear air suspension/valve unit

*BA32.22-P-1005-03G

 Torque tool set

*003589050900

 Torque wrench

*001589862100

If thread is damaged,



Repair connection for pressure line (5).

Model 253.992/993
except code 489 (AIR BODY CONTROL)

AR32.22-P-2001-01RFW

 Knife

*000589122800

21

Install rear fuel cell exhaust air pipe.

When installing right air spring (4).

AR49.10-P-0004RFW

22

Install cover under spring link (6).

23

Attach rear axle underfloor paneling.

AR61.30-P-1001RFW

24

Attach rear wheel.

AR40.10-P-1102A

25

Build up pressure in the air spring (4) using vehicle diagnosis system.



AD00.00-P-2000-04B


Build up pressure in air spring (4) as specified.
Otherwise, the air spring (4) may suffer initial damage and malfunction at a later stage.



Check

26

Check level control system for leak tightness.

AR32.33-P-0021RFW

 Air suspension

Number

Designation

Model 253

BA32.22-P-1005-03G

Pressure line to rear air suspension/valve unit

Nm

2