DAF LF45, LF55 Series. Manual — part 245
©
200508
1-1
General
ZF 6S-850 GEARBOX
ΛΦ45/55 series
3
5
1. GENERAL
1.1 GENERAL
Gearbox type
Each gearbox has a type plate attached to it,
indicating the type of gearbox. You can also find
this data on the identity card for the vehicle
concerned.
ZF gearbox type plate
V300049
1
2
4
5
3
8
6
7
10
9
1.
Type of gearbox
2.
Serial no. (ZF)
3.
Parts list (ZF)
4.
Specification no.
5.
Pulse generator ratio
6.
Gearbox ratio
7.
Engine speed using PTO
8.
PTO speed
9.
Gearbox oil capacity
10.
Oil specification
ZF 6S-850 GEARBOX
1-2
©
200508
General
5
ΛΦ45/55 series
3
1.2 SYSTEM DESCRIPTION, ZF 6S-850 GEARBOX
The gearbox consists of six synchromesh forward
gears and one non-synchromesh reverse gear.
The first and second gears have double-cone
synchronisation.
The sixth gear is a direct drive or an overdrive,
depending upon the model.
V300466
©
200508
2-1
Description of components
ZF 6S-850 GEARBOX
ΛΦ45/55 series
3
5
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 6S-850 GEARBOX
2-2
©
200508
Description of components
5
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).
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.
W 3 03 046
2
3
5
1
4
7
6
8
1
8
2
2
7
4
7
1
6
2 3
3 2
5
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