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Fav 900
Transmission / Transmission control unit
Transmission control unit functional sequence
A
General
Fav 900 chassis number 23/3001 and up
6.8.2001
1005
000005
A
a
4/4
Capitel
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Transmission control unit functional sequence
Sensors
B010 - engine sensor 1 and B011 - engine sensor 2 measure the engine speed. Both sensors must
provide an identical signal. If one sensor fails, it is only possible to proceed in Emergency mode.
B014 - sensor, accumulator shaft and B015 - sensor, bevel pinion measure the rotational and
forward speeds and detect the rotational direction.
B008 - sensor, high-pressure transmits the instantaneous hydraulic pressure in the high-pressure
circuit to the electronics.
B029 - sensor, accelerator transmits the accelerator pedal position to the electronics and compares it
with the engine speed. This position sensor is required for automatic maximum output control.
B017 - sensor, clutch pedal electronically monitors the clutch pedal travel. Before the clutch is
engaged, the transmission ratio is reduced. Pulling away in speed range I approx. 5 km/h, pulling away
in speed range II approx. 10 km/h.
B016 - range sensor I / II electronically monitors the range control travel.
B009 - sensor, output temperature monitors the transmission oil temperature. Temperatures above
110
°
C are stored under fault code 4.1.53.
Actuators
The range control I and II solenoids charge the selector cylinders of range control I / II with hydraulic
oil.
Range control I / II can be actuated under the following conditions:
a) The tractor is stationary.
ETNum-list
Text-module
b) The tractor is moving.
ETNum-list
The transmission neutral / turboclutch valve solenoid controls the turboclutch operation. The
high-pressure valves open as a function of the engine speed.
The speed governor solenoid cancels the approx. 30 km/h speed restriction when the electronics
are operational. The speed restriction is cancelled when 800 ± 50 mA is applied to the solenoid.
The pressure-operated switch monitors clogging of the pressure filter on the ML transmission.
Handbrake switch , with the handbrake on, the two high-pressure valves are opened - both F/R lamps
flash. The transmission is switched to neutral.
Joystick in the right armrest .
1. The engine is running.
2. The neutral switch has been operated, LED N in the armrest is illuminated or the clutch pedal has
been actuated (which opens the high-pressure valves).
3. The tractor can drive at a maximum speed of 2.5 km/h.
4. The range control can be shifted from I to II or from II to I.
1. Speed above 5 km/h
2. The neutral switch has been operated, LED N in the armrest is off (which closes the high-pressure
valves). It is also possible to shift range with the clutch pedal depressed.
3. The transmission must not be under an excessive load (max. 150 bar in the high-pressure circuit).
4. It is only possible to shift from range I up to II.