Iveco EuroCargo (12 to 26 t). Manual — part 80
Electronic sensors provide information about the throttle posi-
tion, the driving range selected by the driver, the engine speed
and the turbine speed, the transmission output shaft speed and
the various system pressures.
Gear selection is controlled by an electronic transmission con-
trol system with a microcomputer.
The closed-loop control logic employed by the electronic con-
trol system allows the transmission to adapt to changes in the
load, terrain or ambient conditions and to automatically com-
pensate for fluctuations in engine power output and for com-
ponent wear.
168
ALLISON GEARBOX MD 3060P
E
URO
C
ARGO
T
ECTOR
12-26 t
Base - February 2003
TRANSMISSION
ALLISON
MD 3060 P
Type
Automatic
Forward runnings
Reverse running
6 forward gears and 1 reverse gears
Power take-off
Optional
Gears
With always-engaged helical teeth
Gear ratios (
:
)
First
Second
Third
Fourth
Fifth
Sixth
Reverse
3.49
1.86
1.41
1.00
0.75
0.65
5.03
Type of oil
Quantity
Tutela GI/A
(28 litres)
(
:
) The gear ratio does not include torque converter gearing up
This paragraph lists main operation anomalies that are not
identified by a diagnostic code.
For every problem, causes and related remedies are shown.
!
For the search of failures through a diagnostic code,
refer to section ”Electric/electronic system” of
”Allison automatic gearboxes” Manual (printout No.
603.42.409)
The operation anomalies being examined in this section are as
follows:
1 -
The vehicle fails to start (engine is not started up);
2 -
The gearbox does not perform forward range or reverse
gear selections (it remains idle);
3 -
The gearbox does not remain in forward gear or in rever-
se gear;
4 -
The gearbox does not insert a specific selection;
5 -
The gearbox does not correctly perform the selections;
6 -
No response from gear selector;
7 -
Clutch slippage and vibration in all ranges;
8 -
Low main pressure in all ranges;
9 -
Low lubrication pressure;
10 - Overheatings in all ranges;
11 - Some oil emerges from filling pipe and/or exhaust;
12 - Intermittent noises (hum);
13 - Oil leakage from output shaft;
14 - Dirty oil.
YES
YES
YES
Selector lever not in neutral.
Select N (neutral) and try again.
NO
1
Battery discharged.
Recharge the battery.
NO
Connect the battery
Battery disconnected.
THE VEHICLE FAILS TO START
(ENGINE DOES NOT START)
ALLISON GEARBOX MD 3060P
169
E
URO
C
ARGO
T
ECTOR
12-26 t
MAIN OPERATION ANOMALIES
YES
YES
Engine idle speed too high.
Adjust engine idle speed to between 500 and 800 rpm.
NO
Fluid level low.
Top up fluid to correct level.
NO
THE GEARBOX DOES NOT PERFORM
FORWARD RANGE OR
REVERSE GEAR SELECTIONS (IT
REMAINS IDLE)
2
YES
YES
Connectors loose or dirty.
Connect or clean.
NO
Speed sensors faulty.
Replace speed sensors.
3
Fluid leaking from solenoid valve unit.
Overhaul the solenoid valve unit.
YES
NO
Replace solenoid valve.
YES
Faulty solenoid valve.
THE GEARBOX DOES NOT REMAIN IN
FORWARD GEAR OR IN
REVERSE GEAR
170
ALLISON GEARBOX MD 3060P
E
URO
C
ARGO
T
ECTOR
12-26 t
Base - February 2003
Incorrect fluid level.
Adjust fluid level.
YES
NO
Replace speed sensors.
YES
Speed sensors faulty.
THE GEARBOX DOES NOT INSERT A
SPECIFIC SELECTION
4
YES
Fluid temperature sensor faulty.
Replace fluid temperature sensor.
NO
5
Engine idle speed too high.
Adjust engine idle speed to between 500 and 800 rpm.
YES
NO
THE GEARBOX DOES NOT CORRECTLY
PERFORM THE
SELECTIONS
Replace speed sensors.
YES
Speed sensors faulty.
(To be continued)
NO
Tighten speed sensor mounting bolts.
YES
Speed sensors loose.
ALLISON GEARBOX MD 3060P
171
E
URO
C
ARGO
T
ECTOR
12-26 t
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