DAF CF65, CF75, CF85 Series . Manual — part 308
3
CF65/75/85 series
General
GEARBOX - PNEUMATIC SECTION
1-15
1.4 SYSTEM DESCRIPTION, GATE PROTECTION
How gate protection works
1
2
3
4
+
V300715
Situation with separate air distribution block
V300860
5
4
1
2
3
Situation with integrated air distribution block
The gate protection only operates in the low
range. The low range is registered by the
low-range switch (2). It prevents shifting from
third or fourth gear (gate 3-4) to first or second
gear (gate 1-2) if the vehicle speed is too high.
This shifting error occurs if the driver fails to use
the range-change gear at the front of the gear
lever to switch to the high range before shifting
from fourth to fifth gear.
4
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3
GEARBOX - PNEUMATIC SECTION
General
CF65/75/85 series
1-16
The moment when the protection is engaged is
determined by the VIC electronic unit (3).
The moment when the protection is engaged is
dependent on the vehicle speed signal.
The gate protection valve (1) is energised if the
following conditions are met:
The vehicle speed is above the set speed, i.e.
the VIC electronic unit (3) supplies voltage to the
low-range switch (2).
The low-range switch (2) is closed if the gearbox
is shifted to the low range.
Pressure is sent to the locking cylinder (4) via
the electronic gate protection valve (1). As a
result, gate 1-2 can no longer be engaged. In
the case of a gearbox with a separate air
distribution block, the locking cylinder is
mounted at the back of the selector housing. In
the case of a gearbox with an integrated air
distribution block, the locking cylinder is
mounted at right angles to the selector housing.
However, if the high range is selected, the gate
protection valve (1) can no longer be energised
as the low-range switch (2) has been opened.
Gate 5-6 (1-2) can then again be engaged.
Note:
For reasons of safety, downshifting must always
be possible. Hence, by exerting additional
shifting power, it is still possible to reach gate
1-2 against the pressure of the locking cylinder.
4
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3
CF65/75/85 series
General
GEARBOX - PNEUMATIC SECTION
1-17
1.5 PNEUMATIC DIAGRAM, GEARBOX CONTROL
Pneumatic diagram of 16 S Direct Drive
Version
CF75/85, production date < 2003-21
N
V
1
21
22
1
22
21
GV
GP
H
L
H
L
H
L
4
1
21
22
V300420
1
5
4
3
6
26
H
L
25
2
+
1
2
8
7
L
H
1
41
H
L
4
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3
GEARBOX - PNEUMATIC SECTION
General
CF65/75/85 series
1-18
Version
CF75/85, production date ≥ 2003-21
N
V
1
21
22
1
22
21
GV
GP
H
L
H
L
1
2
H
L
4
1
21
22
26
H
L
25
V300712
1
5
4
3
7
6
2
L
H
1
41
H
L
4
ᓻ 200337
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