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GENERAL
30 - 20
30
Three situations may appear:
1. CORRECT I NCORRE CTPerform the same rotations number of the tie rod
connecting rod on left side and on the right side until
obtaining the same value ”A”.
2. INCORRECTCORRECTAdjust the parallelism at the same value for left and
right side ensuring the same value “A” on both sides.
3. INCORRECTINCORRE CTPerform first the repartition in order to balance the
value “A” on each side, than adjust the parallelism
(see Case 2}.
NR. PARALLELISM REPARTITION CORRECTION WH ICH MUST PERFORMED
CRT.
PARALLELISM ADJUSTMENT
Loosen the lock nut (1) maintaining the tie
rod of steeri ng connecting rod (2) in a fi xed
position.
Act upon the tie rod of steering connecting
rod taking into account its rotation sense, in
order to obtain the convergence or divergence
and also the fact that one of its complete rotation
leads to an axial displacement of 1.5 mm.
After obtaining the correct parallelism, tighten
the lock nut to the required moment of 5 daNm.
2
1
F ront axles checking and adjustment
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GENERAL
30 - 21
30Front axles checking and adjustment
THE DEVIATION TO THE LEFT OR TO RIGHT
AT STABLE SPEED
Perform the preliminary checking:
Wheels (front, rear ) : Joints clearance:
- pressure - bushings
- dimensions
- types Checking points heights:
- balancing - symmetry
a.m. conditions
are respected
Correct the faults
The deviation persists
Checking finished
Check the fr ont axle st eering ge ometry
The deviation persists
NO
YES
NO
YES
YES
Check the rear axle
p arallelism and the alignmentA
Checking finished
NO
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GENERAL
30 - 22
30
A
The axle
adjustment is correct
Checking finishedReplacement of damaged
elements
NO
YES
Deviation
persists
Checking finished NOYES
Co
mmute the wheels
unt il the deviation is
balanced.
CAPTION :
To check
Performed operations
F ront axles checking and adjustment
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FRONT AX LES ELEMENTS
31
31 - 1
Chara cteristics
The front axle is composed of two joint half axles with independents wheels, designed for the
suspension type Mc.Pherson.
The joints of front half axle arm are done by means of an elastic bearing (chassis side) and by
means of a suspension ball joint (wheel side)
The transmission of the motion to the wheels is done by means of two planetary a xles, not
equal, with homocinetic tripod joints.
The wheel hub is assembled in the steering knuckle by means of a sealed bearing.
The brake disks a re ventilated.
TIGHTENING MOMENTS (daNm)
Wheel attachment screw 7.5
Suspension arm shaft nuts 10.5
Attachment nut of the ball joint screw 6.2
The nut of the attachment screw of the steering knuckle with the shock absorber 10.5
Transmissio n nut 28.0
Steering ball joint nut 4.0
Attachment anti roll bar screws 4.0
Connecting strap screws 2.7
Attachment screws of the suspension ball joint on the arm 7…..7.5
Attachment screws of the disk on the hub 1.4
Aux.connecting rod- assembled connecting rod end stop nut 5.0
Assembled connecting rod end- rack joint body 5.0
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FRONT AX LES ELEMENTS
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31 - 2
TIGHTENING MOMENTS (daNm)
Wheels attachment screws 7.5
Suspension arm shaft nuts 10.5
A ttachment nut of the ball joint screw 6.2
An ti – roll bar bearings screws 4.0
Ball joint attachment screws nuts on the arm 7….7.5
St raps attachment screws 2.7
Suspension arm
REMARK :
T he dismounting-remounting operations are identical for both half axles (specifying
that on the right side one strap is provided and on the left side two straps are provided).
DISMOUNTING
Disconnect the battery.
Loosen the front wheels attachment screws.
Lift the vehicle on an elevator with two columns.
Dismount the two wheels.
Dismount the anti roll bar attachment screws (1) on the suspension arms.
Detach the anti roll bar.
Dismou nt :
- the suspension upper ball joint screw (2) and nut on the steering knuckle;
- the upper attachment strap screw on the right/left wing lining;
- the nuts (3) and the arm a ttachment axles on the power train a nd the strap (straps);
- the arms.
12
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FRONT AX LES ELEMENTS
31
31 - 3
Suspension arm
REMOU NT I NG
REMARK :
Ensure the presence of t he protection pl ate (A) on the suspension ball joint axle.
Perform the operations in the following sequence:
− Arm attachment on the power train support without tightening to the required moment
the axles nuts (3) .
− Ball joint mounting in the steering knuckle
− Attachment of the ball joint screw and tightening its nut to the required moment ;
M ount the wheels, tighten the screws to the required moment, and then with the vehicle on
wheels, continue with:
– Remounting the anti roll bar by tightening to the required moment the attachment screws.
– Tightening the shaft a rm nuts a nd fixing the strap (straps) – (4) to the upper pa rt, by
tightening the screws to the required moment.
REMARK :
When remounting the attachment buffers on the anti roll bar, put inside them 1 g of
grease type MOYKOTE 33 MEDIUM.
When remounting the suspension arm axles, use new self-locking nuts.
3A
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FRONT AX LES ELEMENTS
31
31 - 4
The mounting of the arm attachment axles and of the straps on the frame, is different from left
side to right side.
RIGHT SIDE LEFT SIDE
Suspension arm
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FRONT AX LES ELEMENTS
31
31 - 5
Elastic bushings of the suspension arm
Necessary Special Tools
P. F. 601 Bushings mounting device
P. F. 602 Bushing extractor
REPLACEMENT
This operation implies bushings replacement one by one, in order to maintains their centering
as to the arm shaft. The operation is to be performed using a press (mechanical/ manual driving)
Dismount one of the bushings, by means of the PF 602 device, using a 31 mm outside diam-
eter rod.
Mount the new bushing, observing the value A =239 ± 0.4 mm.
Dismount the second bushing, proceeding in the same a.m. shown way, in order to maintain
the va lue A = 239 ± 0.4 mm
Mounting of the elastic bushings is performed by means of the device PF 601.
REMARK :
The elastic bushings are to be m ounted on the suspension arm by pressing, with
continuos pressing on the outside bushing, avoiding hammering.
A
φφ φφ
31
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