Iveco Stralis AT/AD. Manual — part 146
B.
proceed as described in point ”1”;
C. after eliminating the end float further tighten the two
adjustment lock rings (4, Figure 74) to obtain a retraction
of the caps (2) of 0.15 to 0.33 mm, which corresponds
to the sum of the readings on the dial gauges (1).
Figure 73
3.
further tighten the two adjustment lock rings (4, Figure 74)
to obtain a retraction of the caps (2, Figure 74), measured
on Axis X or on axis Y as described in point ”2” of: 0.15
to 0.33 mm which corresponds to a preload on the bear-
ings of 1.7 to 3.9 Nm (0.17 to 0.39 kgm).
60636
ADJUSTING THE CAP GAP
Adjusting and checking retraction of the caps can be done
with two methods:
1
st
METHOD
1.
Use wrench 99355025 (3, Figure 74) to tighten the
adjustment lock rings (4) of the bearings until eliminating
the pinion-crown wheel clearance and end float. At the
same time check that the crown wheel does not force
on the pinion;
2.
using a suitable micrometer positioned diagonally and
centrally in points (X-Y-arrows, Figure 73);
measure and note the distance of the caps;
2
nd
METHOD
A. Diagonally and centrally on the outer machined seats of
both caps (2, Figure 74) position two dial gauges (1) with
magnetic base as shown in Figure 74;
Figure 74
60635
34
REAR AXLE MS 13-175
S
TRALIS
AT/AD
Base - January 2003
Adjust the axial clearance between the teeth of the pinion
- crown wheel unit which must be 0.26 to 0.50 mm
proceeding as follows:
- stop the bevel pinion from turning using tool 99370317;
- position the magnetic-based dial gauge (1) as illustrated;
- using wrench 99355025 (3) slacken the adjustment lock
ring on the crown wheel side and tighten, to the same
extent, the adjustment lock ring (2) of the opposite side.
The purpose of this is to leave the previously-adjusted
cap retraction unchanged;
- proceed as described until obtaining the specified
clearance.
The clearance should be checked on 4 points the same
distance apart.
49248
49246
19451
Figure 75
Figure 76
Figure 77
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.
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.
Refit and repeat the adjustment operations described
previously.
REAR AXLE MS 13-175
35
S
TRALIS
AT/AD
19453
19454
Figure 78
Figure 79
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.
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.
19452
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.
Figure 80
THEROETICAL CONTACT AREA
1
2
3
4
36
REAR AXLE MS 13-175
S
TRALIS
AT/AD
Base - January 2003
Figure 81
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
REAR AXLE MS 13-175
37
S
TRALIS
AT/AD
CORRECTING THE CROWN WHEEL AND PINION CONTACTS (AFTER ASSEMBLY)
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