Checking service pressures on four-circuit protection valve

AR42.60-L-0040B

Checking service pressures on four-circuit protection valve

6.7.09



Checking



Notes on four-circuit protection valve

AH42.60-N-0001-01A

1

Connect test kit

 Connect test kit to supply coupling head, test connections for circuits 3 and 4 (35.02), test connection (circuit 1) (H1) and test connection (circuit 2) (H2).

*360589002100

Test kit

*360589002100

2

Fill brake system with compressed air until pressure governor switches off

*BE42.10-N-1001-10C

Test kit

*360589002100

3

Check operating pressure of service brake circuits 1 and 2

*BE42.10-N-1003-10C

Test kit

*360589002100

 Brake pedal winch

*000589183100

 If the operating pressure deviates from the specified value:

Set operating pressure for brake circuits 1 and 2

AR42.60-L-0040-01B

If the setting range of the overflow valves for circuits 1 and 2 at the four-circuit protection valve (4.03) is not sufficient:

Check compressed air drier with integral pressure regulator (6.13).

AR42.60-L-0010A

If operating pressure exceeds specified value:

Check safety valve

If operating pressure is below specified value:

Check compressed-air system for leaks

AR42.60-L-0001-01A

Checking delivery rate of compressor

AR13.30-L-1001A

4

Check operating pressure of auxiliary consumer circuits 3 and 4

*BE42.10-N-1004-10C

Test kit

*360589002100

 Brake pedal winch

*000589183100

 If the operating pressure deviates from the specified value:

Set operating pressure for brake circuits 3 and 4

AR42.60-L-0040-02B

If the setting range of the overflow valves for circuits 3 and 4 at the four-circuit protection valve (4.03) is not sufficient:

Check compressed air drier with integral pressure regulator (6.13).

AR42.60-L-0010A

If operating pressure exceeds specified value:

Check safety valve

If operating pressure is below specified value:

Check compressed-air system for leaks

AR42.60-L-0001-01A

Checking delivery rate of compressor

AR13.30-L-1001A

5

Check safety pressure of circuits 1 to 4

 Simulate pressure loss (defect) in one of the brake circuits with approx. 0 bar. If the securing pressure of the other brake circuits deviates from the specified value:

*BE42.10-N-1006-10C

The four-circuit protection valve (4.03) must be replaced.

 The test must be repeated for each brake circuit.

Test kit

*360589002100

6.1

Check safety function of the four-circuit protection valve (4.03)

Only for Knorr four-circuit protection valve.

 Simulate pressure drop in circuit 21, in the process the four-circuit protection valve (4.03) must blow off audibly.

 The characteristics of this four-circuit protection valve (4.03) are that for a pressure drop in circuit 21 as of 4 bar (+ 0.5 bar) circuit 23 is vented to the atmosphere.

7

Check that four-circuit protection valve (4.03) fills circuits 1 and 2 as a priority.

 Bleed brake circuits 1 to 4 below the specified safety pressure

If brake circuits 1 and 2 are not filled as a priority: 

*BE42.10-N-1006-10C

The four-circuit protection valve (4.03) must be replaced.

Test kit

*360589002100

8

Disconnect test kit

 Detach test kit from supply coupling head, test connections of circuits 3 and 4 (35.02), test connection (circuit 1) (H1) and test connection (circuit 2) (H2).

Test kit

*360589002100

Number

Designation

Model
668, 670 with
code B16
Steel suspension
Solo and tractor vehicle
as of VIN 131965
up to VIN 134642

Model
668, 670 with
code B16
Steel suspension
Solo and tractor vehicle
as of VIN 134643

BE42.10-N-1001-10C

Cut-off pressure

bar

12,3

12,3

BE42.10-N-1003-10C

Operating pressure of service brake circuit 1 and 2

bar

10,2

10,2

BE42.10-N-1004-10C

Operating pressure, auxiliary consumer circuits 3 and 4

bar

10,2

10,2

BE42.10-N-1006-10C

Securing pressure circuits 1-4 (with replenishment in intact circuits, defective circuit 0 bar)

bar

>5,5

>5,5

Number

Designation

Model
668, 670 with code B16 and
code B43 Steel suspension
Towing vehicle
up to VIN 123600

Model
668, 670 with code B16 and
code B43 Steel suspension
Towing vehicle
as of VIN 123601
up to VIN 131964

BE42.10-N-1001-10C

Cut-off pressure

bar

8.5 (-0.4)

10,2

BE42.10-N-1003-10C

Operating pressure of service brake circuit 1 and 2

bar

8.5...7.1

8.5...7.1

BE42.10-N-1004-10C

Operating pressure, auxiliary consumer circuits 3 and 4

bar

8.5...7.2

8.5...7.1

BE42.10-N-1006-10C

Securing pressure circuits 1-4 (with replenishment in intact circuits, defective circuit 0 bar)

bar

6.7

>5,5