Iveco Daily Euro 4. Manual — part 194
Main hydraulic power steering operating faults:
1
-
Steering stiff when turning right and left;
2
-
Steering stiff only when turning left or right;
3
-
Steering stiff when the wheel is turned quickly;
4
-
When steering, heavy jolts are felt at the wheel;
5
-
Torsional vibration of the steering wheel;
1
YES
NO
YES
NO
YES
NO
YES
NO
YES
STEERING STIFF
WHEN TURNING
RIGHT AND LEFT
Insufficient oil in system
Open tank and check oil level. With engine running, top
up oil to upper mark on dipstick and bleed system.
Air in hydraulic circuit
Check suction tube and pump shaft seal for leaks. Bleed
system and top up the oil
Pump regulating valve jammed or blocked
Replace the power steering pump
Insufficient oil pump delivery
Overhaul or replace pump.
Universal joint not serviceable
Make joint free to slide by moving it to and fro several
times so that it tilts under its own weight
6
-
Excessive play at the steering wheel;
7
-
Loss of oil;
8
-
Insufficient pressure in the circuit;
9
-
The vehicle tends to move sidewards;
10 -
Hydraulic power steering pilot light always lighted.
NO
Internal power steering failure
YES
Replace the power steering unit
6
STEERING GEAR
D
AILY
E
URO
4
Check suction tube and pump shaft seal for leaks. Bleed
system and top up the oil
2
YES
STEERING STIFF ONLY WHEN
TURNING LEFT OR RIGHT
Incorrect position of hydraulic centre (when wheel is
released, the steering returns to one end of travel by
itself): (ZF steering case only).
Replace the power steering unit
YES
NO
YES
NO
YES
3
STEERING STIFF WHEN THE WHEEL
IS TURNED QUICKLY
Regulating valve in pump blocked
Replace the power steering pump
Insufficient pump delivery (gears worn)
Replace the hydraulic pump
Air in steering system
YES
Insufficient oil in system
Top up oil and bleed system
4
YES
NO
YES
NO
WHEN STEERING, HEAVY JOLTS
ARE FELT AT THE WHEEL
Play in universal joint
Fit a new seal
Replace the power steering unit
Internal failure of hydraulic power steering
(Continue)
STEERING GEAR
7
D
AILY
E
URO
YES
NO
YES
NO
YES
YES
NO
YES
NO
Front wheel geometry incorrect
Check and adjust according to specifications in the section
”Axles”
Wheels out of balance
Balance in accordance with instructions given in the
section ”Wheels and tyres”
Steering rod joints loose on the levers
Replace any worn parts
Irregular pump operation
Replace pump
Leakage of oil from hydraulic power steering circuit
couplings
Check coupling seals for serviceability, replacing any
which are worn
Adjust in accordance with characteristic data for
described in the section ”Axles”
Wrong wheel toe-in
5
YES
NO
YES
TORSIONAL VIBRATION OF THE
STEERING WHEEL
YES
NO
Wheels out of balance
Balance in accordance with instructions given in the
section ”Wheels and tyres”
Air in hydraulic system
Check suction tube and pump shaft seal for leaks. Bleed
system and top up the fluid.
8
STEERING GEAR
D
AILY
E
URO
4
Play in ball joints and/or elastic supports loosen
Play in universal joint
NO
YES
NO
YES
6
EXCESSIVE PLAY AT THE
STEERING WHEEL
Secure the supports
Replace the ball joints
Replace universal joint
Replace the power steering unit
Internal failure of hydraulic power steering
In any case it is necessary to determine the place and the reason why there is oil leakage, eliminate the cause, top up oil in
the tank with the engine started up to the upper mark of the dipstick.
7
YES
NO
YES
LOSS OF OIL
Tank cover not secured
Secure cover
Seal gaskets worn
Replace worn seal gaskets, top up oil and bleed
YES
8
INSUFFICIENT PRESSURE
IN THE CIRCUIT
Hydraulic pump not operating correctly
Replace the power steering pump
YES
(Continue)
STEERING GEAR
9
D
AILY
E
URO
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