Four-circuit protection valve pressure maintenance function - Checking

AR42.60-W-0050A

Four-circuit protection valve pressure maintenance function - Checking

9.12.10

6.12.10

Illustration showing Knorr four-circuit protection valve for constant pressure system and for code (BC3) Pressure control system (10 bar), added.

Step 12

BT42.60-W-0001-02A



Checking

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

1

Secure vehicle against rolling

2

Check coupling head for pressure test (A) on supply circuit coupling head (6)

 Only on vehicles with trailer control.



WF58.50-W-4260-05A

3

Connect test kit

 Required connections:

 Circuit 1 test connection (1)

 Circuit 2 test connection (2)

Also on vehicles with trailer control:

 Circuit 3 test connection (3)



*360589002100

4

Start engine and completely inflate air brake system with idle speed

5

Turn off engine

6

Switch on ignition

7

Release parking brake

8

Check protection pressure for circuit 1 and circuit 2

AR42.60-W-0050-01A

Static safety pressure (closing pressure), four-circuit protection valve for circuit 1 and 2

*BE42.10-N-1008-10B



*360589002100

 If the determined values deviate from the given specified values:



Replace 4-circuit protection valve.

9

Start the engine and inflate compressed air system at idle speed, until circuits 1 and 2 reach a reservoir pressure of > 9 bar

10

Turn off engine

11

Switch on ignition

12

Check protection pressure for circuit 3

On vehicles with trailer control

AR42.60-W-0050-02AA

On vehicles without trailer control

AR42.60-W-0050-02AB

Static safety pressure (closing pressure), four-circuit protection valve for circuit 3

*BE42.10-N-1009-10B



*360589002100

 If the determined values deviate from the given specified values:



Replace 4-circuit protection valve.



Function of four-circuit protection valve modified

BT42.60-W-0001-02A

13

Check pressure circuit inflating sequence

AR42.60-W-0050-05A



*360589002100

 If the determined inflation sequence deviates from the given inflation sequence:



Replace 4-circuit protection valve.

14

Switch off ignition

15

Disconnect test kit

Number

Designation

Model
375.1/3/
4 without code BC3

Model
375.1/3/4
with Code BC3

BE42.10-N-1008-10B

Static protection pressure (closing pressure), four-circuit protection valve, circuits 1 and 2 (without replenishment and 0 bar in defective circuit)

bar

4.5

4.5

BE42.10-N-1009-10B

Static safety pressure (closing pressure), four-circuit protection valve for circuit 3 and 4 (without replenishment and 0 bar in defective circuit)

bar

4.5

4.5

Number

Designation

Model
958.0/2/4

BE42.10-N-1008-10B

Static protection pressure (closing pressure), four-circuit protection valve, circuits 1 and 2 (without replenishment and 0 bar in defective circuit)

bar

4.5

BE42.10-N-1009-10B

Static safety pressure (closing pressure), four-circuit protection valve for circuit 3 and 4 (without replenishment and 0 bar in defective circuit)

bar

4.5

Number

Designation

Model
970, 972, 974, 975, 976
without code BC3

Model
970, 972, 974, 975, 976
with code BC3

BE42.10-N-1008-10B

Static protection pressure (closing pressure), four-circuit protection valve, circuits 1 and 2 (without replenishment and 0 bar in defective circuit)

bar

4.5

4.5

BE42.10-N-1009-10B

Static safety pressure (closing pressure), four-circuit protection valve for circuit 3 and 4 (without replenishment and 0 bar in defective circuit)

bar

4.5

4.5