Iveco EuroCargo (12 to 26 t). Manual — part 182
78618
794310
PARKING BRAKE CONTROL
MANUAL DISTRIBUTOR
( V eh ic les ad ap t ed f o r t ow in g )
The device allows performing the safety and parking braking
of tractor and trailer.
The parking braking is mechanical for tractor and pneumatic
for trailer.
The device further allows checking the braking tractor effect.
Such operation is mandatory when the vehicle is parked
under high slope conditions.
The device is connected as follows:
1 -
From four-way protection valve
21 -
To spring cylinders
22 -
To trailer braking triple-control servodistributor.
Figure 49
Air leakage from
exhaust with control
lever:
In unbraking position
In braking position
Difficult control lever
rotation
Check and revise the device, replacing the faulty parts.
Accurately clean the various pieces composing it.
Check and revise the device, replacing the faulty parts.
Accurately clean the various pieces composing it.
Revise the device and wet all sliding parts.
INCONVENIENCE
POSSIBLE REASON
REMEDY
Faulty valve (5), related seat or sealing
ring
Deteriorated valve (9), pistons (5),
sealing rings and valve (7).
Interference inside the distributor
Diagnostics
E
URO
C
ARGO
T
ECTOR
12-26 t
PNEUMATIC SYSTEM - BRAKES
73
Base - February 2003
The device, controlled by the two independent tractor
circuits in duplex distributor and spring brake circuit, controls
trailer braking; moreover, a predominance adjusting device is
provided that is placed outside the lower part.
62373
60255
793332
TRIPLE CONTROL SERVODIS-
TRIBUTOR
Predominance adjustment
The apparatus is equipped with a predominance adjusting
device.
The operations to be carried out for adjusting the
servodistributor predominance are performed in the
following order:
- Unscrew screw (2) from silencer body.
- Insert a socket-head screw in the hole through silencer
body and operate on the hexagonal body (1) hole.
- By CLOCKWISE rotating a predominance increase is
obtained.
- By COUNTERCLOCKWISE rotating, a predominance
decrease is obtained.
Diagnostics
Sealing gaskets leakage.
Faulty discharge valve and seat.
Sealing gaskets air leakage.
Worn or faulty pistons and seats.
Yielded springs
Revise the device replacing the faulty parts.
Revise the device replacing the faulty parts.
Revise the device replacing the faulty parts.
Revise the device replacing the faulty parts.
Revise the device replacing the faulty parts.
Air leakage from
exhaust under rest
conditions
Output pressures
different from the
established ones
bar
Figure 50
Figure 51
Figure 52
The apparatus embeds a device that allows performing the
trailer braking even in case of control duct failure.
QUICK DISCHARGE VALVE
71952
Function of the component is discharging the compressed air
from front axle membrane brake cylinders to obtain a quick
unbraking.
INCONVENIENCE
POSSIBLE REASON
REMEDY
E
URO
C
ARGO
T
ECTOR
12-26 t
74
PNEUMATIC SYSTEM - BRAKES
Base - February 2003
52871
71953
71954
The brake cylinder transmits the force impressed by the
compressed air when operating the brake pedal to the
mechanical service braking device.
In case of anomalies, it is necessary to replace the complete
cylinder.
798510
COUPLING HEADS
- Moderate
- Automatic
Operation
The coupling operation consists in rotating a head with
respect to the other (tractor trailer), guided by a rib that runs
into a suitable guide till it locks. In this phase, seal gasket (C)
pushes downwards the shutoff valve from the other head (A),
by overcoming the resistance of spring (B). A communication
is thereby opened between the two heads guaranteeing their
seal. By uncoupling the heads, the valves are automatically
closed guaranteeing their seal.
The version for ”Moderate” duct is equipped with a red cover
and a safety projection (1), while the version for ”Automatic”
duct is equipped with a yellow cover and a lateral safety
projection (2). The safety projections are used to avoid
coupling errors.
PRESSURE PLUG VALVE
Pressure plugs are inserted into pneumatic system pipings or
tanks,
in
order
to
facilitate
connecting
diagnostics
manometers.
Figure 53
Figure 54
Figure 55
Figure 56
794911
MEMBRANE BRAKE CYLINDER
(for disc brakes and drum brakes)
72657
E
URO
C
ARGO
T
ECTOR
12-26 t
PNEUMATIC SYSTEM - BRAKES
75
Base - February 2003
Air leakage from
exhaust or check
band
Air leakage from
membrane section
supply
Braking force
decrease during
parking brakings
Broken or holed membrane.
Membrane lip breakage.
Check band locking screws loosening.
Deterioration of parts composing the
spring section.
Spring breakage.
Replace the membrane.
Tighten the screw.
Revise the device replacing the worn parts and if necessary
replace the complete cylinder.
Replace the complete cylinder.
Diagnostics
794922
COMBINED BRAKE CYLINDER
The device is composed of two parts: a membrane part for
service braking and a spring part for parking and emergency
braking in case of braking system failure.
Combined
cylinder
emergency
unbraking
device
Repair interventions
Figure 57
Figure 58
Figure 59
36744
36745
When it is not possible to pneumatically supply the combined
cylinder (1) spring section, it is possible to manually unbrake the
vehicle to allow its towing. In order to unbrake the vehicle, it
is necessary to unscrew screw (2) till its end of stroke.
35721
Before detaching the combined cylinder (1) from the vehicle,
perform the manual unbraking procedure of the combined
cylinder by unscrewing screw (2) till its end of stroke.
!
It is possible to disassemble only the membrane
section.
In case of anomaly of the cylinder spring section, do
not disassemble such part since the above operation
could be dangerous for the operator.
!
It is advisable, before proceeding with the
disassembly, to accurately clean the external parts
from earth and other impurities that by seeping
inside could damage the cylinder.
INCONVENIENCE
POSSIBLE REASON
REMEDY
E
URO
C
ARGO
T
ECTOR
12-26 t
76
PNEUMATIC SYSTEM - BRAKES
Base - February 2003
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