DAF LF45, LF55 Series. Manual - part 246

©

 200508

2-3

Description of components

ZF 6S-850 GEARBOX

ΛΦ45/55 series

3

5

Double-cone synchronisation
As a result of the speed difference to be 

eliminated in the lower gears, the synchronisation 

forces may be considerable. In order to achieve 

effective synchronisation, a synchroniser with a 

double cone is used.

This synchroniser consists of an outer and an 

inner ring (synchromesh rings) connected to the 

main shaft of the gearbox by means of the 

selector sleeve support.

The ring between the two synchromesh rings is 

connected to the gear wheel by means of the 

selector ring.

When the selector sleeve moves into the selector 

ring, two synchronisation surfaces are active.

A

B

C

7 3

2

V301005

A.

Not connected

B.

Synchronise

C.

Connected

W 3 03 047

ZF 6S-850 GEARBOX

2-4

©

 200508

Description of components

5

ΛΦ45/55 series

3

©

 200508

3-1

Inspection and adjustment

ZF 6S-850 GEARBOX

ΛΦ45/55 series

3

5

3. INSPECTION AND ADJUSTMENT

3.1 CHECKING GEARBOX OIL LEVEL

To prevent skin injury, avoid 

unnecessary contact with the 

drained oil.

ZF 6S-850 gearbox
1.

Position the vehicle on a level surface.

2.

Wait for some minutes to allow the oil to flow 

back.

3.

Remove the level check plug and check the 

oil level.

4.

The oil level must reach the rim of the level 

check/filler opening (A).

5.

After checking the oil level, tighten the level 

check plug to the specified torque. See 

"Technical data".

}

B

M3038

A

ZF 6S-850 GEARBOX

3-2

©

 200508

Inspection and adjustment

5

ΛΦ45/55 series

3

3.2 INSPECTION AND ADJUSTMENT, INPUT SHAFT BEARING AXIAL PLAY

ZF 6S-850 gearbox
1.

Remove the gearbox. See "Removal and 

installation".

2.

Remove the gearbox front cover from the 

input shaft. See "Removal and installation".

3.

Press the outermost bearing race uniformly 

so that the bearing is free of play. Constantly 

rotate the input shaft while applying pressure 

so that the bearing is set.

4.

Use a depth gauge to determine the depth of 

the chamber in the gearbox front cover, 

distance A.

5.

Install a new gasket in the gearbox housing. 

Use a depth gauge to determine the height 

the ball bearing protrudes above the gearbox 

housing, distance B.

6.

Calculate the play as follows. See the table 

below.

7.

Compare the calculated value with the 

maximum permissible axial play. See 

"Technical data".

8.

If necessary, adjust the axial play by means 

of another adjusting ring.

9.

Fit a new gasket in the gearbox front cover 

and fit it on the gearbox. See "Removal and 

installation".

10. Fit the attachment bolts. Tighten the bolts to 

the specified torque. See "Technical data".

11. Fit the gearbox. See "Removal and 

installation".

B

A

V3 00 435

Distance A

8.05 mm

Distance B

- 7.90 mm

Play

0.15 mm