Iveco Stralis AT/AD. Manual — part 109
GEARBOXES ALLISON MD 3060 PR ALLISON 3066 MD PR
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5302
Gearboxes
Allison MD 3060 PR
Allison MD 3066 PR
Page
DESCRIPTION
175
. . . . . . . . . . . . . . . . . . . . . . . . . .
TECHNICAL DESIGNATION
178
. . . . . . . . . . . . . .
- Identification plate
178
. . . . . . . . . . . . . . . . . . . . . .
CHARACTERISTICS AND DATA
179
. . . . . . . . . . .
MAIN OPERATION ANOMALIES
180
. . . . . . . . . .
TIGHTENING TORQUES
188
. . . . . . . . . . . . . . . . .
TOOLS
188
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND REFITTING OF THE
TRANSMISSION
189
. . . . . . . . . . . . . . . . . . . . . .
- Removal
189
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- Refitting
189
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISCONNECTING AND CONNECTING
GEARBOX CONTROL MODULE AGAIN
192
. .
- Disconnecting
192
. . . . . . . . . . . . . . . . . . . . . . . . .
- Refitting
192
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPLACING SPEED SENSORS
192
. . . . . . . . . . . . .
- Replacing turbine speed sensor
192
. . . . . . . . . . . .
- Engine revolutions sensor replacement
193
. . . . . .
- Replacing the output speed sensor
193
. . . . . . . . .
REPLACING OIL LEVEL SENSOR
193
. . . . . . . . . . .
REPLACING OIL SUCTION FILTER
194
. . . . . . . . .
REPLACING THE SOLENOID VALVES
194
. . . . . .
REPLACING PLANE GASKETS IN GEARBOX
CONTROL MODULE
195
. . . . . . . . . . . . . . . . . .
REPLACING PRESSURE SWITCH F3
196
. . . . . . . . .
REPLACING THE SEAL RING ON
THE OUTPUT SHAFT
196
. . . . . . . . . . . . . . . . . .
Figure 1
DESCRIPTION
Allison MD 3060 PR-MD 3066 PR gearboxes are automatics
and provides six forward gears and one reverse gear through
an hydrodynamic torque converter, two clutches, three
brakes and three crown wheels.
The 5th and 6th gears are overgeared up.
The reverse gear has a ratio that is greater than the first gear
that allows a better speed control on slopes.
They are fitted with a power takeoff device and an integrated
retarder for noiseless and progressive braking.
61402
ALLISON AUTOMATIC GEARBOX
GEARBOXES ALLISON MD 3060 PR ALLISON 3066 MD PR
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The gearbox is equipped with the power takeoff gear. (5 -
Figure 2).
The power takeoff can be installed on the left or on the right
side of the converter box (7 - Figure 3; 3 - Figure 4).
Figure 2
61783
Clutches are pressure-balanced on both piston sides to
prolong the clutch life and for a more accurate control on the
whole range of gearbox gears.
Planetary gears always being engaged are of the helical teeth
type to allow a more silent gearbox operation.
The hydrodynamic torque converter, in addition to being
mandatory for vehicle start-up, allows a gearbox operation
without shakes reducing wear of members composing the
vehicle kinematic chain.
The torsional forces emitted by the engine are absorbed due
to the clutch/damper lockup so that they are not transmitted
to gears and the remaining parts of the transmission. The wide
lockup operation reduces fuel consumption and improves
braking efficiency.
ALLISON MD 3060 PR/3066 PR AUTOMATIC GEARBOX
1. Exclusion clutch/torsional damper lockup - 2. Converter turbine - 3. Converter pump - 4. Converter box -
5. Power takeoff gear - 6. Front support - 7. Clutch box - 8. Clutch - 9. Main box - 10. Brake - 11. Front planetary gear -
12. Brake - 13. Central planetary gear - 14. Brake - 15. Rear planetary gear - 16. Retarder stator - 17. Retarder -
18. Retarder rotor - 19. Output shaft - 20. Main shaft - 21. Hydro-electric controls - 22. Clutch - 23. Oil pump -
24. Oil pump driving stub - 25. Front support sleeve - 26. Converter stator - 27. Turbine shaft.
Gear selection is controlled by an electronic transmission con-
trol system with a microcomputer.
The closed-loop control logic employed by the electronic
control system allows the transmission to adapt to changes in
the load, terrain or ambient conditions and to automatically
compensate for fluctuations in engine power output and for
component wear.
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GEARBOXES ALLISON MD 3060 PR ALLISON MD 3066 PR
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Base - January 2003
MD 3060 PR AUTOMATIC GEARBOX REAR RIGHT VIEW
1. Assembly pads - 2. Exchanger arrangement - 3. Pressure control socket - 4. Electric gearbox wiring connector - 5. Identifying
plate - 6. Engine revolution sensor - 7. Power takeoff connection (available on both sides) - 8. Exhaust
Figure 3
MD 3060 PR AUTOMATIC GEARBOX FRONT LEFT VIEW
1. Start-up crown - 2. Front torque converter cover - 3. Power takeoff connection (available on both sides) -
4. Pressure control socket - 5. Retarder accumulator - 6. Oil filling pipe and level rod (available on both sides) -
7. Retarder - 8. Assembly pads
Figure 4
61786
61787
GEARBOXES ALLISON MD 3060 PR ALLISON 3066 MD PR
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