Remove/install complete rear axle

AR35.10-P-0010RFW

Remove/install complete rear axle

14.10.2019

Model

253.992/993 with engine 780

Modification notes

02.10.2019

Note on coolant AH20.00-N-2080-01A added.

Notes.

1

Rear axle

7

Holder for coolant lines

2

Retaining bracket for high voltage lines

8

Plug connections

3.1

High-voltage line

9

Ground cable

3.2

High-voltage line

11

Rear axle rear bolts

4

High-voltage line

12

Rear axle front bolts

5

Plug connections

F34/6

High-voltage distributor plate

6

Plug connections

13

Bolts

14

Electrical connector

1

Rear axle

16

Electrical connector

17

Electrical connector

1

Rear axle

9

Ground cable

1

Rear axle

18

Bolts

19

Bracket

 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

 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

Topical note

Notes on coolant

AH20.00-N-2080-01A

Topical note

Notes on fuel cell system

AH00.00-P-0022-01RFW

Topical note

Notes on coolant level

AH20.00-P-1142-01RFW

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

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

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

Release pressure in the FCS with vehicle diagnosis system.

AR06.00-P-1001RFW

If the diagnosis-based depressurization is not feasible,



Manually release pressure in fuel cell system

AR06.00-P-1000RFW

2

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

Topical note

Requirements for driving into the workshop

AH00.00-P-0021-01RFW

3

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



OF00.00-P-3000-21RFW

4

Shift drive unit into position N or into idle position.

5

Drain pressure of air suspension at rear axle using vehicle diagnosis system.



AD00.00-P-2000-04B

6

Perform manual enabling of high-voltage on-board electrical system.

AR47.70-P-1010RFW

 The diagnosis-based power disconnect is not possible in this case.

7

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

8

Raise vehicle and fix in place on vehicle lift.

AR00.60-P-0100CW

9

Remove rear wheels.

AR40.10-P-1102A

10

Remove fender liner from fenders at rear.

AR88.10-P-1400LW

11

Remove underfloor paneling in area of rear axle.

AR61.30-P-1001RFW

12

Remove rear fuel cell exhaust air pipe.

AR49.10-P-0004RFW

13

Remove retaining bracket high voltage lines (2).

14

Remove or unplug high voltage lines (3.1, 3.2, 4) from high voltage distributor plate (F34/6).

AR47.70-P-0004RFW

15

Seal open contacts or open electrical connectors.

 Set of protective covers

*001589019100

 Set of protective caps

*001589029100

16

Remove screws (18).

 Screw, holder to high-voltage distributor/axle drive module

*BA54.10-P-1010-03E

17

Route high voltage line with holder (19) out of rear axle (1) and let it hang down.

18

Drain off low-temperature circuit coolant.

AR20.00-P-1144RFW

19

Drain coolant for high-voltage battery cooling system.

AR08.50-P-0021RFW

20

Remove holder for coolant lines (7).

21

Disconnect connector coupling (5, 6, 8).

AR20.20-P-7441-01RQ

 Collect escaping coolant using suitably clean container.

22

Disconnect electrical connectors (16, 17).

23

Unscrew ground line (9) from rear axle.

 Nut, equipotential bonding line to ground point on rear axle

*BA08.10-P-1003-01I

24

Remove bolts (13) from right shock absorber and left shock absorber.

 Bolt, shock absorber to body

*BA32.25-P-1002-03P

25

Remove brake calipers from right and left rear axle, then place free of tension to one side and secure.

AR42.10-P-0080LW

 Removal: Do not unscrew or disconnect brake lines.

26

Remove hydrogen filler line.

AR47.60-P-0070RFW

27

Disconnect electrical connector (14).

28

Remove air springs.

AR32.22-P-1500RFW

29

Position lifting platform with mount on rear axle(1) and secure with tensioning strap.



000 588 03 62 00 Lifting platform

WS01.00-P-0091A

 Commercially available tools: Universal major assembly mount

30

Remove bolts from rear of rear axle (11).

 Installation: Replace bolts for rear of rear axle (11).

 Self-locking bolt securing front decoupling element of rear axle carrier to frame floor assembly

*BA35.10-P-1001-01H

31

Remove front bolts from rear of rear axle (12).

 Installation: Replace bolts at front of rear axle (12).

 Self-locking bolt securing rear decoupling element of rear axle carrier to frame floor assembly

*BA35.10-P-1002-01H

32

Carefully lower rear axle.



000 588 03 62 00 Lifting platform

WS01.00-P-0091A

 Check for freedom of movement.
Helper required.

33

Install in the reverse order.

 Electric motor

Number

Designation

Model 253.992/993

BA08.10-P-1003-01I

Nut, equipotential bonding line to ground point on rear axle

Nm

16

 Rear axle shock absorber

Number

Designation

Model 253

BA32.25-P-1002-03P

Bolt, shock absorber to body

Stage 1

Nm

15

Stage 2

Nm

36

 Rear axle carrier

Number

Designation

Model 253

BA35.10-P-1001-01H

Self-locking bolt securing front decoupling element of rear axle carrier to frame floor assembly

Stage 1

Nm

100

Stage 2: Loosen

°

180

Stage 3

Nm

100

Stage 4

°

90

 Rear axle carrier

Number

Designation

Model 253

BA35.10-P-1002-01H

Self-locking bolt securing rear decoupling element of rear axle carrier to frame floor assembly

Stage 1

Nm

100

Stage 2: Loosen

°

180

Stage 3

Nm

100

Stage 4

°

90

 High-voltage distributor

Number

Designation

Model 253
with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))

Model 253
with code ME02 (Fuel cell)

BA54.10-P-1010-03E

Screw, holder to high-voltage distributor/axle drive module

M8

Nm

-

15