Check main circuit coolant expansion reservoir cap

AR08.50-D-0042TE

Check main circuit coolant expansion reservoir cap

26.11.2019

Engine

780.703 in model 910

1

Cap

2

Adapter

3

Pressure pump

 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



Check

1

Remove cap (1) of the main circuit coolant expansion reservoir.

 Turn cap (1) counterclockwise only up to the safety catch and relieve overpressure. Then unscrew cap (1).

2

Check the cap (1) for corrosion.

If corrosion is present,



change the cap (1).

3

Attach the adapter (2) to the hose of the pressure pump (3).

 Adapter

*210589036300

 Pressure pump

*124589242100

4

Attach cap (1) to the adapter (2).

 Adapter

*210589036300

5

Slowly apply test pressure to the cap (1) and establish opening pressure.

 Build up the test pressure by max. 0.4 bar per second until the opening pressure is reached.
The test pressure must decrease once the opening pressure has been reached. When the valve is open, an escape of air with only a small flow volume is discernible. Overpressure valve closes max. 0.35 bar after opening pressure has been reached.

Test pressure, expansion reservoir cap

*BE08.50-N-1003-01TE

If specified values are not reached,



change the cap (1).

6

Remove the cap (1) from the adapter (2).

 Adapter

*210589036300

7

Attach cap (1) to the main circuit coolant expansion reservoir.

Cooling system

Number

Designation

Engine 780.703 in model 910

BE08.50-N-1003-01TE

Test pressure, expansion reservoir cap

Main circuit

bar

1,4 (0,1)

Auxiliary circuit

bar

1,4 (0,1)