Remove/install check valve

AR47.25-P-0004RFW

Remove/install check valve

06.12.2018

Engine

780 in model 253.992/993

1

Check valve

5

Union nut

2

Union nut

6

High pressure pipe

3

Bracket

7

Union nut

4

Bolts

8

Gas distributor

S7

High-voltage disconnect device

 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 fuel cell system

AH00.00-P-0022-01RFW

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Notes on safety-relevant components

AH00.00-Z-0019-01A

 

Remove/install

1

Release pressure in fuel cell system with vehicle diagnosis system.

AR06.00-P-1001RFW

2

Manually release the pressure in the fuel cell system.

If the diagnosis-based pressure release cannot be performed.

AR06.00-P-1000RFW

3

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

Topical note

Requirements for driving into the workshop

AH00.00-P-0021-01RFW

4

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



OF00.00-P-3000-21RFW

5

Activate high-voltage disconnect device (S7), as shown in picture sequence (A, B, C), and lock it with a shackle-type lock.

 Installation:
Carefully connect high-voltage disconnect device (S7), as show in picture sequence (D, E, F).
Otherwise the high-voltage disconnect device (S7) will be damaged.

 For the electrical interruption of the tank components.

 Keep the key for the shackle-type lock of the high-voltage disconnect device (S7) in a separate location accessible to authorized personnel only.

 Installation: Check high-voltage disconnect device (S7) for damage.

If damage is present,



Remove contacts from coupling housing of high-voltage disconnect device (S7) and replace high-voltage disconnect device (S7).

Remove/install contacts from coupling housing of high-voltage disconnect device.

AR00.19-P-0120-31A

 New passenger car wiring harness repair kit

*220589049900

 Unlocker with ejector MLK 1.2_plug

*220589019925

 Wiring harness repair kit, basic

*000589139900

6

Remove rear right underfloor paneling.

AR61.30-P-1001RFW

 Installation: Do not install the underfloor paneling until the leak test has been completed.

7

Remove the rear right wheel.

AR40.10-P-1102A

8

Remove fender liner in right rear fender.

AR88.10-P-1400LW

9

Unscrew union nut (2) of check valve (1).

AR47.60-P-0070RFW

10

Unscrew union nut (7) of gas distributor (8).

 Union nut, hydrogen line to check valve/gas distributor

*BA47.60-P-1015-01B

11

Unscrew screw/bolts (4).

 Bolt, holder for check valve to assembly frame for rear fuel tank

*BA47.60-P-1013-01B

12

Remove the bracket (3) with check valve (1) and high-pressure line (6).

 Do not unfasten union nut (5).

13

Seal open lines and connections.

 Set of protective caps

*001589009100

 Record plug

*129589009100

14

Remove the bracket (3) of check valve (1).

When replacing check valve (1).

15

Install in the reverse order.



Check

16

Perform fuel system leak test.

AR47.60-P-0001RFW

 Tank system

Number

Designation

Engine 780 in model 253.992/993
with code ME02 (Fuel cell)

BA47.60-P-1013-01B

Bolt, holder for check valve to assembly frame for rear fuel tank

M6

Nm

8

 Tank system

Number

Designation

Engine 780 in model 253.992/993
with code ME02 (Fuel cell)

BA47.60-P-1015-01B

Union nut, hydrogen line to check valve/gas distributor

Nm

20