DAF CF65, CF75, CF85 Series . Manual — part 301
3
CF65/75/85 series
General
PNEUMATICALLY ASSISTED GEARBOX CONTROL
(SERVOSHIFT)
1-1
1. GENERAL
1.1 SYSTEM DESCRIPTION, PNEUMATICALLY ASSISTED GEARBOX
CONTROL (SERVOSHIFT)
The “Servoshift” pneumatically assisted gearbox
control is an assisted mechanical/pneumatic
gear selector system for the gearbox.
This system is identical to the mechanical
gearbox controls, from the gear lever to the
gearbox, however, the gearbox is pneumatically
assisted.
For details of adjustments to the selector
mechanism, refer to “Mechanical gearbox
control”.
The Servoshift unit is an important feature of
the pneumatically assisted gearbox control.
The Servoshift unit can be ventilated in two
ways:
1.
Ventilation via the neutral position
valve (4):
1.
Servoshift unit
2.
Selector rod
3.
Selector shaft housing
4.
Neutral position valve
V300409
3
4
2
1
2.
Ventilation via the splitter relay valve (2):
1.
Servoshift unit
2.
Splitter relay valve
3.
Selector shaft housing (with integrated air
distribution block)
As a result, pneumatic clutch support via the
Servoshift unit (1) can only be provided when
the clutch is fully depressed.
V300851
3
2
1
3
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3
PNEUMATICALLY ASSISTED GEARBOX CONTROL
(SERVOSHIFT)
General
CF65/75/85 series
1-2
Gate selection
Gates are selected mechanically.
To select a gate, move the gear lever to the left
or to the right, which moves the selector shaft to
the left or to the right.
Engaging gears
To engage the gears, move the gear lever
forwards or backwards.
Switching begins mechanically with the
operation of the selector valve in the
Servoshift unit. This valve controls the
double-acting pneumatic cylinder, and the
selection is pneumatically assisted.
Emergency selector
If there is no air pressure, selection can still be
done mechanically, i.e. non-assisted.
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CF65/75/85 series
Description of components
PNEUMATICALLY ASSISTED GEARBOX CONTROL
(SERVOSHIFT)
2-1
2. DESCRIPTION OF COMPONENTS
2.1 SERVOSHIFT UNIT OPERATION
15
14
12
13
11
10
9
8
7
6
5
4
3
2
1
V300335
1.
Supply pressure connection (circuit 4)
2.
Operating piston
3.
Venting valve
4.
Selector valve for operating piston, 1
st
, 3
rd
,
5
th
, 7th gear
5.
Valve seat, 1
st
, 3
rd
, 5
th
, 7th gear
6.
Valve, 1
st
, 3
rd
, 5
th
, 7
th
gear
7.
Valve, 2
st
, 4
rd
, 6
th
, 8
th
gear
8.
Valve seat, 2
nd
, 4
th
, 6
th
, 8
th
gear
9.
Selector valve for operating piston, 2
nd
, 4
th
,
6
th
, 8
th
gear
10. Piston selector valve
11. Selector valve spring
12. Servo-operating shaft
13. Retaining elements
14. Servo-lever
15. Selector valve lever
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3
PNEUMATICALLY ASSISTED GEARBOX CONTROL
(SERVOSHIFT)
Description of components
CF65/75/85 series
2-2
SERVOSHIFT SELECTOR SHAFT HOUSING
Situation with separate air distribution block:
V300345
27
29
28
26
23
24
25
42
40
35
39
33
34
37
41
43
36
47
46
38
44
45
32
31
30
3
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