Iveco Daily Euro 4. Manual — part 99
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6 S 400 O.D. TRANSMISSION
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The 6 S 400 O.D. transmission is mechanical with synchronized
engagement of forward gears.
It is composed of a light alloy box (which also serves as a clutch
cover), a rear cover (where the speed engagement controls
and gearing are housed) and a control box.
There is an opening on the side of the transmission to apply
a power take-off.
Drive transmission is accomplished by a set of helical-toothed
constant mesh gears, for both forward and reverse gears.
The splined or machined gears are on four shafts: input, main,
transmission and reverse gear.
The input and main shafts are supported, in the transmission,
by watertight, non-adjustable ball bearings.
The transmission shaft is supported, in the transmission, by
roller bearings that can be adjusted axially by means of ring
shims.
6
th
, 5
th
, 4
th
, 3
rd
and reverse gears (new version transmissions)
are synchronised by means of single taper free synchroniser
rings; double taper wheels are used for 1
st
and 2
nd
gear.
Control inside the transmission is accomplished with five rods:
a main rod to select and engage gears; four rods equipped with
forks for engaging gears.
The external control is achieved by means of two levers:
(selection and engagement levers). The levers are actuated by
tie-rods through a transfer case, connected to the gear shift
lever located in the cab, by an assembly made up of two
flexible cables (BOWDEN cables).
The external engagement lever features two opposed
weights, used to dampen the flexible control cable
(BOWDEN) engagement thrust and, as a result, its noise.
Figure 1
108639
6 S 400 O.D. TRANSMISSION
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84147
84148
The combined action of the selector lever (2) and the engagement lever (1) cause the rotation and axial movement of the rod (4)
in two subsequent steps to engage the required gear by means of the rods (8-7-6 and 9).
Neutral arrangement and/or 3
rd
/4
th
gear
selection and engagement arrangement
3
rd
/4
th
gear selection
According to the angular position of the selector lever (2), the
slider (3) turns with the rod (4) (which is integral) and the
selector (5) arranges the slider on the 3
rd
/4
th
gear rod (9). At
the same time, the slider (3) moves the rod (10) to prevent
the simultaneous engagement of two gears, to keep the 3
rd
and 4
th
gear engagement rod (9) free and to prevent
movement of the other rods by engaging the grooves in the
rods.
3
rd
/4
th
gear engagement
According to the movement of the engagement lever (1), the
slider (3) axial moves the rod (4) (which is integral), the
selector (5) (previously arranged) and consequently the
chosen 3
rd
and 4
th
gear engagement rod (9).
Neutral position coincides with the 3
rd
/4
th
gear selection
arrangement.
In this case, the vertical axis of the selector lever (2) is exactly
at 90
° with respect to the horizontal axis of the control
corresponding to no angular variation of the rod (4).
This arrangement is obtained by moving the selector lever (2)
anticlockwise. In this way, the selector (4) is inserted in the
1
st
/2
nd
gear engagement rod (5).
By moving the lever (1), the slider (3) will axially move the
1
st
/2
nd
gear engagement rod (5).
1
st/
3
rd
gear selection election and engagement
arrangement
Figure 2
Figure 3
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6 S 400 O.D. TRANSMISSION
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84149
84150
5
th
/6
th
gear
selection
and
engagement
arrangement
This arrangement is obtained by moving the selector lever (2)
clockwise. In this way, the selector (4) is inserted in the 5
th
/6
th
gear engagement rod (5).
By moving the lever (1), the slider (3) will axially move the
5
th
/6
th
gear engagement rod.
This arrangement is obtained by moving the selector lever (2)
anticlockwise. In this way, the selector (4) is inserted in the re-
verse gear engagement rod (5).
By moving the lever (1), the slider (3) will axially move the re-
verse gear engagement rod (5).
Safety device
The transmission is equipped with a device which prevents the
simultaneous engagement of two gears.
It consists of a suitably shaped rod (6) fitted transversally in the
transmission box.
The slider (3), moves the rod (6) under the action of the lever
(2). This keeps the selected gear engagement rod free and
prevents movement of the other gears by engaging their
respective grooves.
Reverse
gear
selection
and
engagement
arrangement
Figure 4
Figure 5
SECTION A-A
SECTION A-A
6 S 400 O.D. TRANSMISSION
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