DAF LF45, LF55 Series. Manual - part 240

©

 200508

2-1

Description of components

ZF S5-42 GEARBOX

ΛΦ45/55 series

3

4

2. DESCRIPTION OF COMPONENTS

2.1 SYNCHRONISER

B-lock synchronisation

The synchroniser consists of the following parts:

1

8

2

2

7

4

7

1

6

2 3

3 2

5

1.

gear wheel

2.

selector ring

3.

synchromesh ring 

4.

selector sleeve

5.

pressure spring

6.

thrust piece

7.

selector sleeve

8.

main shaft

ZF S5-42 GEARBOX

2-2

©

 200508

Description of components

4

ΛΦ45/55 series

3

In neutral, the selector sleeve (7) is in the centre 

position.

Pressure springs (5) push the thrust pieces (6) 

into a wedge-shaped recess in the selector 

sleeve (7).

The gear wheels (1) and corresponding selector 

rings (2) move freely around the main shaft (8).

If the selector sleeve (7) is shifted to the right from 

the neutral position, the synchromesh ring (3) is 

pushed against the friction cone of the selector 

ring (2) by the thrust pieces (6).

The difference in speed immediately turns the 

synchromesh ring (3) as far as a stop on the 

selector sleeve support (4), which is not in the 

figure, and thus prevents further movement of 

selector sleeve (7).

W 3 03 046

2
3
5
1
4

7

6

8

©

 200508

2-3

Description of components

ZF S5-42 GEARBOX

ΛΦ45/55 series

3

4

As a result of continued pressure on selector 

sleeve (7) (friction), the speed of the gear (1) to 

be shifted with selector ring (2) matches the 

speed of the main shaft (8).

The bevelled sides of the teeth on the 

synchromesh ring (3) and selector sleeve (7) 

cause synchromesh ring (3) to be turned back 

slightly after synchronisation.

This releases the lock and allows selector sleeve 

(7) to be moved into the teeth of selector ring (2).

As a result, the relevant gear is engaged.

1

8

2

2

7

4

7

1

6

2 3

3 2

5

A

B

C

7 3

2

V301005

A.

Not connected

B.

Synchronise

C.

Connected

ZF S5-42 GEARBOX

2-4

©

 200508

Description of components

4

ΛΦ45/55 series

3