Remove/install axle modulator

AR42.25-W-3104C

Remove/install axle modulator

05.04.2017

Model

930, 932, 933, 934

with code ZX2 (EPB II)

Modification notes

31.03.2017

Remove assembly plate with mounted fifth wheel coupling, added.

Operation step 4.1

AR31.10-W-0001BB

31.03.2017

Remove fifth wheel coupling, added.

Operation step 4.2

AR31.10-W-0001BA

31.03.2017

Remove slider with mounted fifth wheel coupling, added.

Operation step 4.3

AR31.10-W-0001HB

1

Compressed air connector (brake cylinder)

2

Compressed air connector (reservoir pressure)

3

Compressed air connector (redundancy pressure)

4

Electrical connector (redundancy control)

5

Electrical connectors (power supply and CAN lines)

6

Electrical connector (rpm sensor)

31.13

Drive axle axle modulator

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear buttoned-up and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

Notes on checking axle modulator before replacement

AH42.25-W-0001-01A

 

Remove/install

1

Secure vehicle against rolling

2

Switch off ignition

3

Fully drain compressed-air system

4.1

Remove assembly plate with mounted fifth wheel coupling

Fifth wheel coupling with separate assembly plate
Only if access to the drive axle modulator (31.13) is difficult.

AR31.10-W-0001BB

4.2

Remove fifth wheel coupling

Fifth wheel coupling without separate assembly plate
Only if access to the drive axle modulator (31.13) is difficult.

AR31.10-W-0001BA

4.3

Remove slider with mounted fifth wheel coupling

Fifth wheel coupling with slider
Only if access to the drive axle modulator (31.13) is difficult.

AR31.10-W-0001HB

5

Detach electrical connectors (4, 5, 6) from drive axle modulator (31.13)

6

Mark compressed air connectors (1, 2, 3) as per labeling on drive axle modulator (31.13) and disconnect

AR42.10-W-0900C

 Installation: Pay attention to marking.

7

Remove drive axle modulator (31.13)

 Bolt, axle modulator to frame

*BA42.25-N-1004-01A

8

Install in the reverse order

Check

9

Start engine and completely fill air brake system at idle speed, then switch off engine

10

Switch off ignition

11

Operate brake pedal and lock in place using brake pedal jack

 Brake pedal jack

*000589183100

12

Check compressed air connectors at drive axle modulator (31.13) for leaks

 Use commercially available leak detector spray during visual inspection.

13

Remove brake-pedal winch

14

Perform function test on brake test stand

 Electropneumatic brake (EPB)

Number

Designation

Model 930, 932, 933, 934

BA42.25-N-1004-01A

Bolt, axle modulator to frame

Nm

90