Four-circuit protection valve pressure maintenance function - Checking

AR42.60-W-0050D

Four-circuit protection valve pressure maintenance function - Checking

13.1.10

11.1.10

Switch on ignition, added.

Operation step 5, 10



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

Connect test kit

 Required connections:

 Circuit 1 test connection (1)

 Circuit 2 test connection (2)

 Circuit 3 test connection (3)



*360589002100



Dual-chamber air drier with integral pressure regulator modified, added.

 Only on vehicles with code (B62) Heated compressed-air drier (dual-chamber system).

BT42.60-W-0002-01A

3

Start engine and completely inflate air brake system with idle speed

4

Turn off engine

5

Switch on ignition

6

Release parking brake

7

Check protection pressure for circuit 1 and circuit 2

AR42.60-W-0050-01C

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

*BE42.10-N-1008-10B



*360589002100

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



Replace 4-circuit protection valve.

8

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

9

Turn off engine

10

Switch on ignition

11

Check protection pressure for circuit 3

AR42.60-W-0050-02C

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

*BE42.10-N-1009-10B



*360589002100

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



Replace 4-circuit protection valve.

12

Check compressed-air supply in circuit 4

 For example, by raising the driver seat using the controls.

13

Check pressure circuit inflating sequence

Vehicles without code (BC2) Electronic Air-Processing Unit (EAPU)

AR42.60-W-0050-05A

Vehicles with code (BC2) Electronic Air-Processing Unit (EAPU)

AR42.60-W-0050-05B



*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
930, 932, 933, 934, 944, 950, 952, 953, 954,
957

BE42.10-N-1008-10B

Static safety 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, circuits 3 and 4 (without replenishment and 0 bar in defective circuit)

bar

4.5