Remove/install DC/DC converter

AR47.70-D-1500TE

Remove/install DC/DC converter

17.01.2020

Engine

780.703 in model 910

1

DC/DC converter

4

Ground cable

7

Electrical connector

2

High-voltage plug

5

Positive line

8

Coolant hose

3

Coolant hose

6

Nuts

 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 death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

General information on handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

AH00.00-Z-0300-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

 

Remove/install

1

Remove AC charger for high-voltage battery.

AR47.70-D-1511TE

2

Release and disconnect high-voltage plug (2).

3

Cover electrical connections with suitable protective covers.

 Set of protective covers

*001589019100

4

Remove coolant hose (3).

AR08.50-P-0018-01EQ

 Seal connections. Collect coolant which flows out.

 Commercially available devices/tools
Collecting pan

 Set of protective covers

*001589019100

5

Remove ground line (4) and place to one side.

Check ground lines for high-voltage on-board electrical system potential equalization

AR47.70-D-1020-01TE

 Installation: Check ground line (4).

 Nut, potential equalization ground line to body

*BA47.70-N-1006-02TE

 Screw, potential equalization ground line to DC/DC converter

*BA47.70-N-1007-02TE

6

Remove positive line (5) and place to one side.

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 Nut, positive line to DC/DC converter

*BA47.70-N-1002-05TE

7

Remove nuts (6).

 Nut, DC/DC converter to DC/DC converter holder

*BA47.70-N-1001-05TE

8

Lift DC/DC converter (1) and place to one side.

9

Detach electrical connector (7).

10

Remove DC/DC converter (1).

11

Transfer coolant hose (8).

If a new DC/DC converter (1) is installed.

AR08.50-P-0018-01EQ

 Collect coolant which flows out.

 Commercially available devices/tools
Collecting pan

12

Install in the reverse order.

13

Perform commissioning of the DC/DC converter (1) with the vehicle diagnosis system.

If a new DC/DC converter (1) is installed.



Connect/disconnect diagnostic unit

AD00.00-D-2000-06TS

 DC/DC converter

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1001-05TE

Nut, DC/DC converter to DC/DC converter holder

Nm

23

 DC/DC converter

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1002-05TE

Nut, positive line to DC/DC converter

Nm

20

 High-voltage on-board electrical system potential equalization ground lines

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1006-02TE

Nut, potential equalization ground line to body

Nm

16

 High-voltage on-board electrical system potential equalization ground lines

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1007-02TE

Screw, potential equalization ground line to DC/DC converter

Nm

16