Iveco EuroCargo (12 to 26 t). Manual — part 159
Locked or clogged limiting valve.
Disassemble the valve, wash and check. The throttling
holes must not be clogged.
Insufficient oil pump flow rate
Replace the pump.
Poorly-sliding spider joint.
Make the joint slidable alternatively moving it many
times so that it can be slanted under its own weight.
NO
YES
YES
YES
YES
Inefficient internal gaskets.
Sent the steering to a ZF or TRW station.
Wrong hydraulic center position (if the steering wheel
is left free, the steering spontaneously goes to an
extreme position).
Make the hydraulic power steering adjusted by a ZF
or TRW station.
2
YES
HARD STEERING ONLY IN LEFT OR
RIGHT STEERING
YES
YES
Clogge limiting valve.
Disassemble the valve, wash and clean.
Insufficient hydraulic pump flow rate.
Revise or replace the hydraulic pump.
Presence of air in steering system.
Check suction pipe seal in pump shaft gasket and
top-up the oil. Drain the system.
3
YES
HARD STEERING WHEN THE STEER-
ING WHEEL IS QUICKLY ROTATED
NO
NO
NO
NO
E
URO
C
ARGO
T
ECTOR
12-26 t
STEERING
5
Base - February 2003
Cardan joint clearance.
Replace the cardan joint.
4
YES
WHEN ONE STEERS, STRONG IMPACTS
OCCUR ON STEERING WHEEL
YES
YES
NO
YES
Internal hydraulic power steering failure.
Send the hydraulic power steering to a ZF or TRW
station.
Insufficient system oil.
Top-up the oil and drain the system.
Wrong wheels attitude.
Carry out checks and adjustments according to
characteristic data included in “FRONT AXLE”
section.
Unbalanced wheels.
Carry
out
the
rebalancing
according
to
the
instructions included in chapter “Wheels and tires”.
Oil blow-by from hydraulic power steering circuit
fittings.
Check fittings gaskets efficiency replacing the worn
ones.
NO
NO
NO
YES
YES
YES
Loosened steering tie-rod heads on levers.
Replace the possibly worn parts.
NO
YES
Irregular hydraulic pump operation.
Replace the hydraulic pump.
NO
NO
E
URO
C
ARGO
T
ECTOR
12-26 t
6
STEERING
Base - February 2003
Check suction pipe and pump shaft gasket seal and
top-up the oil. Drain the system..
Wrong wheels attitude.
Carry out checks and adjustments according to
characteristics data included in “FRONT AXLE”
section.
YES
YES
NO
Clearance in ball joints and/or slow elastic supports.
Secure the supports.
Replace the ball joints.
Clearance in cardan joint.
Replace the cardan joint.
Internal hydraulic power steering failure.
Send the hydraulic power steering to a ZF or TRW
station.
NO
6
YES
YES
NO
Unbalanced wheels.
Carry out the balancing following the instructions
included in chapter “Wheels and tires”.
5
YES
TORSIONAL STEERING WHEEL
VIBRATIONS
YES
NO
Presence of air in hydraulic system.
EXCESSIVE STEERING WHEEL
CLEARANCE
E
URO
C
ARGO
T
ECTOR
12-26 t
STEERING
7
Base - February 2003
YES
YES
NO
Irregular hydraulic pump operation.
Revise or replace the hydraulic pump.
Oil blow-by from circuit fittings.
Check fittings gaskets efficiency replacing the worn
ones.
Insufficient tank oil level.
Restore the level simultaneously carrying out the
circuit drain.
NO
8
YES
YES
NO
The tank cover is loosened.
Secure the cover.
7
YES
Worn sealing gaskets.
Replace worn sealing gaskets, top-up the oil and drain.
OIL LEAKAGE
In any case it is necessary to establish where and why the hydraulic oil is lost, remove the reason and top-up the oil in the
tank with running engine till the upper level rod mark.
INSUFFICIENT CIRCUIT PRESSURE
YES
NO
Oil blow-by from circuit fittings.
Check fittings gaskets efficiency replacing the worn
ones.
Insufficient tank oil level.
Restore the level simultaneously carrying out the
circuit drain.
NO
YES
E
URO
C
ARGO
T
ECTOR
12-26 t
8
STEERING
Base - February 2003
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