3B-2 STEERING GEAR BOX AND LINKAGE
SERVOSTEERING DIAGNOSTICS
Condition Possible cause Reference item
• Not enough oil
• Air in the system
• Pressure pump does not provide enough fluid
• Breakdown in the distribution valves group.
• Blockage in the oil tank inlet or outlet
• Both parts of the servo steering piston are
intercommunicated
• Mechanical faults at the steering system of the
vehicle
Servo steering
does not work.
Check oil level
Check for leaks, purge and fill oil
Authorized dealer revision.
Authorized dealer revision.
Remove tubings and clean them
Authorized dealer revision.
Revision and substitution
• The steering piston has no pressure
• Faulty operation of the distribution valve
Authorized dealer revision.
Authorized dealer revision.
Too much play on
the steering wheel
• Steering box gear attachments loose.
• Too much play between the piston and the
spindle
• Too much play on threadings
• Too much play on ball-and-socket joints
Tighten fixing nuts.
Authorized dealer revision.
Authorized dealer revision and
substitute.
Substitution
Intermittent
Stiffness of the
servo steering
• Distribution valve dirty
• Faulty operation of the pressure pump
• Not enough oil
• Oil dirty
Authorized dealer revision.
Authorized dealer revision.
Refill.
Change oil
Oil Leaks
• Faulty retention rings or assembly
deficiencies
Authorized dealer revision.
Stiff Servo
steering
• Faulty operation of the pressure pump
Authorized dealer revision.
The servo steering
does not come back
correctly
• Seizing up of the gyration system
• Servo steering pieces have become
deformed because of breakdown in the
distribution valves group
• Low pressure at the tyres
Revision, reparation, substitution
Authorized dealer revision.
Inflate tyres
Troubles, shakings
and noises in servo
steering
• Inadequate oil
• Dirtiness inside the pressure pump
• Blockage of the oil tank filter
• Tubings rubbing with bodywork
• Not enough oil in the tank
Empty and use the adequate one.
Authorized dealer revision.
Change filter.
Revision to avoid rubbing.
Fill to the adequate level and revise
installation.
Servo steering feels
stiff in one direc-
tion and normal in
the other one.
• Bad Adjustment of the distribution valve Authorized dealer revision.
Servo steering
turns alone when
the motor is
started.
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