Iveco EuroCargo (12 to 26 t). Manual — part 106

Use a magnetic-based dial gauge (1) to check that the crown
wheel (2) does not have any upper wobble above 0.20 mm.
If it does, disassemble the differential unit and find the cause.

49246

19453

Figure 100

Figure 101

Figure 102

Apply a light layer of Prussian blue on the crown wheel.
Turn the pinion and measure the impression of the contact of
the pinion teeth on the crown wheel teeth.
The following figures show possible contacts and how to
correct any errors.

Refit and repeat the adjustment operations described previ-
ously.

19451

Figure 103

Figure 104

Contacts too much on crown wheel teeth bottom land

Conditions C-D. Indicates that the pinion is fastened too
deeply and needs further adjustment.
To adjust the exact position of the pinion shims should be
added under the pinion support to obtain the exact contact.

Condition C. Measure the clearance and restore it after
adding shims.

Condition D. After adding shims, take the clearance towards
minimum.

19452

Contacts too much towards the crown wheel teeth top land

Conditions A-B. Indicates that the pinion is fastened to much
towards the outside and therefore needs further adjustment.
To adjust the exact position of the pinion, remove shims under
the pinion support to obtain the exact contact.

Condition A. After removing the shims, take the clearance
towards maximum.

Condition B. Measure the clearance and restore it after
removing shims.

19454

Clearance reduction

Clearance increase

1.

Release, concave side of tooth

2.

Top land

3.

Pulling, convex side of tooth

4.

Heel

PULLING. Central tending towards the top land on the tooth
face and central on the tooth profile.

RELEASE. Central tending to the heel on the tooth face and
central on the tooth profile.

Indicates that the pinion is fastened correctly.

The contact position can be further changed by changing the
pinion-crown wheel clearance.

Condition E. Lower the clearance.

Condition F. Increase the clearance.

THEROETICAL CONTACT AREA

1

2

3

4

E

URO

C

ARGO

T

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Figure 105

THEORETICAL CONTACTS

60676

PULLING

(CONVEX SIDE OF RING GEAR)

TIP

RELEASE

(CONCAVE SIDE OF RING GEAR)

TIP

HEEL

TOP

LAND

HEEL

HEEL

TOP

LAND

HEEL

HEEL

TOP

LAND

HEEL

HEEL

TOP

LAND

HEEL

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

- PULLING

:

CENTRAL TENDING TOWARDS THE TOP LAND ON THE TOOTH FACE
AND CENTRAL ON THE TOOTH PROFILE

- RELEASE

:

CENTRAL TENDING TOWARDS THE HEEL ON THE TOOTH FACE
AND CENTRAL ON THE TOOTH PROFILE

CONDITION “A”

PULLING

TIP

RELEASE

TIP

- PULLING RELEASE

:

CONTACTS TOO MUCH AT TIP

- PULLING

:

CONTACT TOO MUCH AT TOP LAND

- RELEASE

:

CONTACT TOO MUCH AT HEEL

- CORRECTIVE ACTION

:

REMOVE SHIMS AND INCREASE CLEARANCE TO MAXIMUM

CONDITION “B”

TIP

TIP

- PULLING - RELEASE

:

CONTACTS TOO MUCH AT TIP

- CORRECTIVE ACTION

:

MEASURE THE CLEARANCE AND RESTORE THE CLEARANCE

CONDITION “C”

TIP

TIP

- PULLING - RELEASE

:

CONTACTS TOO MUCH ON BOTTOM LAND

- CORRECTIVE ACTION

:

MEASURE THE CLEARANCE, ADD SHIMS AND RESTORE CLEARANCE

E

URO

C

ARGO

T

ECTOR

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Figure 106

CONDITION “D”

60677

TIP

TIP

HEEL

TOP

LAND

HEEL

HEEL

TOP

LAND

HEEL

HEEL

TOP

LAND

HEEL

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

BOTTOM LAND

- PULLING - RELEASE

:

CONTACTS TOO MUCH ON BOTTOM LAND

- PULLING:

:

CONTACT TOO MUCH AT HEEL

- RELEASE

:

CONTACT TOO MUCH AT TOP LAND

- CORRECTIVE ACTION

:

ADD SHIMS AND REDUCE CLEARANCE TO MINIMUM

CONDITION “E”

- PULLING

:

CONTACT TOO MUCH AT HEEL

- RELEASE

:

CONTACT TOO MUCH AT TOP LAND

- CORRECTIVE ACTION

:

REDUCE CLEARANCE

CONDITION “F”

- PULLING

:

CONTACT TOO MUCH AT TOP LAND

- RELEASE

:

CONTACT TOO MUCH AT HEEL

- CORRECTIVE ACTION

:

INCREASE CLEARANCE

TIP

TIP

TIP

TIP

E

URO

C

ARGO

T

ECTOR

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AXLES IN TANDEM (INTERMEDIATE)

47

Base - February 2003

77248

77249

Figure 107

Figure 108

Fit on the spring (1) and the fork (2) from inside the differential
casing.

Fit on the spring pin (1) and the split pin (3) to lock the ring
nuts (2-4).

77236

Figure 109

Figure 110

Position the fork (2) in the groove of the coupling (1) and fit
this on the toothing (3) of the differential gear.

77234

Mount the spindle (6). Lubricate the new seal (5) and fit it on
the piston (4) and insert this into the cylinder (3). Apply sealant
on the thread of the cylinder (3) and screw it down into the
differential casing, tightening it to the prescribed torque.

Screw down the screw (2) so as to provisionally prevent the
differential gear unlocking.

Remove the differential casing from the mounting and fit it
back on the axle housing as described under the relevant
heading.

!

If the spring pin or the split pin do not coincide with
their respective seats on the ring nuts, slightly turn
these so it is possible to insert the spring pin or the split
pin,

E

URO

C

ARGO

T

ECTOR

12-26 t

48

AXLES IN TANDEM (INTERMEDIATE)

Base - February 2003