3
AS TRONIC GEARBOX
Description of components CF65/75/85 series
2-2
The gearbox modulator is to ensure that the
gearbox shifts fast and correctly, depending on
the current driving conditions.
All functions that are necessary for selection and
checking of the correct gear are controlled
inside the gearbox modulator.
The gearbox modulator contains the following
components:
- The control unit (ECU)
- Pneumatic solenoid valves and engaging
cylinders
- Travel sensors to determine the current
position of all engaging cylinders
- Sensors for checking the gearbox and
modulator temperatures, rpm of input shaft
and pressure sensor for the air supply to the
pneumatic system
The integrated gearbox electronics are situated
in the upper modulator cover. The electronics
serve to actuate and control the entire
automated gear selector system (gearbox,
clutch, PTO), depending on the driving
conditions (correct gear, fully automatic mode,
operating condition of the vehicle).
Electropneumatic actuation of the gearbox
control is effected by 10 individual pneumatic
solenoid valves.
One solenoid valve functions as the main cut-off
valve for the air supply. A combination of 8
solenoid valves ensures that the engaging
cylinders (1, 2, 4 and 5) are actuated. One
solenoid valve actuates the transmission brake
via an air duct in the gearbox housing.
Engaging cylinder 1 engages the main box and
the selector cylinder (2) ensures that the right
gate is selected for the main box.
The splitter range (GV) is operated by engaging
cylinder 4. The rear-mounted range box (GP) is
operated by engaging cylinder 5.
14
ᓻ 200337
https://www.truck-manuals.net/
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