Iveco Stralis AT/AD. Manual — part 218
Figure 37
Working diagram of air suspensions for 6x2TX/P vehicles
73716
1. Check valve — 2. Rear and second steering axle electro-pneumatic control valve — 3. Central added axle suspension
pressure switch — 4. Second steering axle air spring — 5. Pressure test point — 6. Rear axle air spring — 7. Rear level sensor
8. Pressure sensor — 9. 15-litre air tank — 10. Manual condensate bleed valve — 11. Controlled pressure valve with limited
return (opening pressure 8.5 bars) — 12. 20-litre air tanks — 13. Pressure switch (opening pressure 8 bars)
— 14. MUX electric system.
40
SUSPENSIONS
S
TRALIS
AT/AD
Base - January 2003
Figure 38
Working diagram of pneumatic rear suspensions for 6x4 TZ/P vehicles
73719
1. Check valve — 2. Rear axle electro-pneumatic control valve — 3. Rear level sensor — 4. Rear axle air spring — 5. Pressure
test point — 6. Controlled pressure valve with limited return (opening pressure 8.5 bars) — 7. Manual condensate bleed valve
— 8. 30-litre air tanks — 9. Pressure switch (opening pressure 8 bars) — 10. MUX electric system.
SUSPENSIONS
41
S
TRALIS
AT/AD
42
SUSPENSIONS
S
TRALIS
AT/AD
Base - January 2003
DESCRIPTION
Controlled pressure valve
- Type: KNORR-BREMSE DR 4248 - WABCO 434 100 299
Opening pressure
8,5
+ 0
- 0,3
bar
Electro-pneumatic control valves
- Type: WABCO:
•
472 880 020 — 4 x 2 FP — 6 x 2p FP - 4 x 2 FP tractors
•
472 880 030 — 4 x 2 P Tractors (for rear axle)
•
472 880 001 — 4 x 2 FP/P — 4 x 2 FP tractors
•
472 880 103 — 6 x 2p P/FP
•
472 880 100 — 6 x 2 C Tractors
Supply voltage
24V
Nominal current
0.32A - 0.34A
Working pressure
5
÷ 13 bar
Level sensors
- Type: WABCO 441 050 012
Supply voltage
Pulse 5 to 16 V
Measuring principle
Inductive
Current input
Max 90 mA
Working range of lever
Max 100
°
Check valve
- Type: VOSS 56900209
Maximum working pressure
12 bar
Suspension pressure switch
- Type: WABCO 441 040 015
Supply voltage
8
÷ 32 V
Current input
Max 30 mA
Measuring range
0
÷ 10 bar
Permissible overpressure
Tightening torque
16 bar
27
± 2 Nm
Low air pressure switch
- Type: TDS F13046 S
Working voltage
12/24 V
Permissible electric load
0.001
÷ 1 A
Maximum working pressure
Tightening torque
Opening pressure
12 bar
30
± 2 Nm
8
± 0,2 bar
Manual condensate bleed valve
- Type: VOSS 52089975
Maximum working pressure
13 bar
Air tanks
Tanks
30 Litres
Tanks
20 Litres
Tanks
15 Litres
Electronic control unit
- WABCO 446170201 (4 x 2, 6 x 4 P vehicles)
- WABCO 446170202 (6 x 2 vehicles)
Supply voltage
24 Volt
The sensor comprises a coil, secured on the chassis frame, in
which a piston moves that is connected via a cam to the lever,
which is anchored to the vehicle axle.
With a change in height between the chassis frame and
vehicle axis, the lever turns, moving the piston that
accordingly changes the inductance of the coil wired to the
electronic control unit.
Level sensor
The level sensor constantly informs the electronic control
unit on the change in attitude of the chassis frame with the
road surface.
20437
73807
Figure 39
Figure 40
This limited return valve fulfils two functions:
- It cuts off the flow of compressed air supplying the tanks
when the pressure in the tanks falls under a certain level
(setting) after a breakdown or due to excessive drawing;
- It supplies these tanks as soon as the braking system
reaches a value ensuring fully efficiency for the brakes.
SUSPENSIONS
43
S
TRALIS
AT/AD
MAIN COMPONENTS OF THE PNEUMATIC SYSTEM
793824
Controlled pressure valve
Fault Diagnosis
TROUBLE
POSSIBLE CAUSE
REMEDY
Exhaust leak
Leakage from diaphragm
Overhaul the appliance, replacing worn parts
Air leak from joint of
half-bodies
Leakage from the diaphragm fitting
Delivery leak (into the
atmosphere) with supply
at a lower pressure than
the setting
Leakage from the inlet valve or its seat
Overhaul the appliance, replacing worn parts.
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