Iveco Stralis AT/AD. Manual — part 198
S
TRALIS
AT/AD
82
STEERING REAR ADDED AXLE 57080/D1 (N 8072)
Base - January 2003
TOOL NO.
DESCRIPTION
99374530
Drift to remove and refit kingpin bearings (use with 99370007)
99388001
Wrench (80 mm) for wheel hub bearing adjustment ring nut
99388002
Wrench for screws fastening the track rod arm and the drag link
arm to the stub axle
99389819
Torque wrench (0-10 Nm) with 1/4” square fitting
99395026
Tool for testing hubs rolling torque
(to be used with torque wrench)
73040
The functions of lifting and aid in the pickup phase can be
performed at speeds under 30 km/h with a load on the driving
axle of under 11.5 tonnes, otherwise the system will
automatically lower the added axle.
In order to ensure a greater safety during straight running, rear
axle steering starts when the wheels of the front axle have
exceeded a steering angle of 5º only.
The transmission of steering power from the front axle to the
additional rear axle is hydrostatic, thanks to a slave cylinder
fitted on the front and to a centring cylinder fitted on the
additional rear axle. A hydraulic accumulator stores and
keeps the oil in the system, depending on the centring
cylinder movements, without volume losses.
This system enables the driver to lift the additional axle when
the vehicle operating conditions require it and to move the
load to the driving axle during pickup in condition of poor grip
of the vehicle (assistance during pickup).
All the above operations, however, are bound to specific
conditions of operation and relevant system safety connected
to it.
Lifting, lowering and assistance during pickup are controlled
from a button strip in the cabin, located on the central
dashboard.
Axle lifting prevents tire sliding on ground, during vehicle
manoueuvres.
The device for assistance during pickup allows to totally or
partially transfer the load o the additional axle to the driving
axle so that, in the above describe grip conditions and in
compliance with local laws, friction on the ground is increased.
Keep to the procedure described in the chapter AXLE 55080/D as for wheel hub overhauling.
Adjustment data, tightening torques and tools are the one shown in this chapter.
PNEUMATIC LIFT
GENERAL
Figure 3
STEERING REAR ADDED AXLE 57080/D1 (N 8072)
83
S
TRALIS
AT/AD
REPAIRS
84548
Figure 4
1.
La
mp
-
2
.O
il
ta
nk
-
3
.O
il
p
ump
-
4
.Hyd
ra
ulic
accumula
to
r
-
5.
P
res
sure
ga
ug
e
-
6
.C
ent
ring
cylind
e
r
-
7.
P
res
sure
cont
rol
int
ak
e
s
-
8.
Sla
ve
cylind
e
r
-
9.
P
o
wer
st
eering
sys
te
m
S
TRALIS
AT/AD
84
STEERING REAR ADDED AXLE 57080/D1 (N 8072)
Base - January 2003
84549
Figure 5
1.
O
il
ta
nk
w
it
h
low
oil
lev
el
sw
it
ch
-
2
.Hyd
ra
ulic
p
ump
-
3
.P
res
sure
ga
ug
e
-
4
.Hyd
ra
ulic
accumula
to
r
-
5.
C
e
nt
ring
cylind
e
r
-
6.
P
res
sure
cont
rol
int
ak
es
-
7
.Pr
e
ssu
re
co
n
tr
o
l
in
take
s
-
8
.S
lave
cy
lin
de
r
-
9
.Po
w
e
r
ste
e
ri
n
g
sy
ste
m
(Illustrative)
STEERING REAR ADDED AXLE 57080/D1 (N 8072)
85
S
TRALIS
AT/AD
HYDRAULIC SYSTEM
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