Remove/install automatic linkage adjuster

AR42.15-W-0010B

Remove/install automatic linkage adjuster

17.09.2015

Model

374, 375.3, 940, 942, 943, 944, 949, 950, 952, 953, 954, 958.2/4

Rear axle with drum brake

Model

930, 932, 933, 934

Rear axle with drum brake with brake wear sensor

Shown on rear axle 748.23

1

Pin

6

Thrust plate

11

Brake camshaft

2

Washer

7

Brake wear sensor

12

Adjustment screw

3

Cotter pin

8

Screw

13

Drifts

4

Screw

9

Control arm

14

Brake shoes

5

Retaining ring

10

Linkage adjuster

Pfeil

Direction of stop



Remove

1

Secure vehicle against rolling

2

Release parking brake

 To release the combination brake cylinder a reservoir pressure of at least 8 bar must be given.

3

Remove brake wear sensor (7)

AR42.10-W-1050A

4

Turn brake camshaft (11) and linkage adjuster (10) back to starting position using adjusting screw (12).

 Turn adjusting screw (12) counterclockwise. Creaking noises occur when turning screw.

5

Remove brake drum

AR42.10-W-1010A

6

Remove pin (1)

7

Remove bolt (8) from control arm (9)

8

Wedge brake shoes (14) using suitable drifts (13) and pull out brake camshaft (11) until linkage adjuster (10) can be removed

9

Remove linkage adjuster (10) from brake camshaft (11)



Automatic linkage adjuster modified

BT42.15-W-0001-01A

10

Remove shim from brake camshaft (11)

 The shim is not shown in the graphic. It is located between linkage adjuster (10) and bearing bracket.



Install

11

Slide shim onto brake camshaft (11)

12

Position linkage adjuster (10) on brake camshaft (11)



Automatic linkage adjuster modified

BT42.15-W-0001-01A

13

Slide brake camshaft (11) up to contact surface in stop direction (arrow)

14

Install bolt (1)

 It must be possible to insert pin (1) without resistance.

15

Push on washer (2) and secure bolt (1) using new cotter pin (3)

16

Adjust control arm (9) at linkage adjuster (10)

AR42.15-W-0010-02A

 Bolt, control arm to bearing bracket

*BA42.15-N-1003-01A

17

Check/adjust axial play of brake camshaft (11)

AR42.15-W-1050-02A

End play of brake camshaft between brake cam and brake carrier

*BE42.15-N-1001-01A

18

Install brake drum

AR42.10-W-1010A

19

Install brake wear sensor (7)

AR42.10-W-1050A

Test values for mechanical system

Number

Designation

Model 374, 375.3, 958.2/4

Model 930, 932, 933, 934, 940, 942, 943, 944, 950, 952, 953, 954

BE42.15-N-1001-01A

End play of brake camshaft between brake cam and brake carrier

mm

1,0

1,0

Test values for mechanical system

Number

Designation

Model 949

BE42.15-N-1001-01A

End play of brake camshaft between brake cam and brake carrier

mm

1,0

 Brake mechanical system

Number

Designation

Model 374

Model 375.3, 930, 932, 933, 934, 950, 952, 953, 954
Front axle

BA42.15-N-1003-01A

Bolt, control arm to bearing bracket

Nm

22

22

 Brake mechanical system

Number

Designation

Model 375.3, 930, 932, 933, 934, 950, 952, 953, 954
Rear axle

Model 940, 942, 943, 944
Front axle

BA42.15-N-1003-01A

Bolt, control arm to bearing bracket

Nm

22

22

 Brake mechanical system

Number

Designation

Model 940, 942, 943, 944
Rear axle

MODEL 958

BA42.15-N-1003-01A

Bolt, control arm to bearing bracket

Nm

22

22

 Brake mechanical system

Number

Designation

Model 949
Front axle

Model 949
Rear axle

BA42.15-N-1003-01A

Bolt, control arm to bearing bracket

Nm

22

22