Iveco Stralis AT/AD. Manual — part 172
77246
60636
77247
49248
Figure 95
Figure 96
Figure 97
Figure 98
Lubricate taper roller bearings (1) and fit outer races.
Screw in adjustment ring nuts (2).
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 97) 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 97);
measure and note the distance of the caps;
3.
further tighten the two adjustment lock rings (4,
Figure 97) to obtain a retraction of the caps (2, Figure 97),
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 bearings of 1.7 to 3.9 Nm (0.17 to 0.39 kgm).
2
nd
METHOD
A. Diagonally and centrally on the outer machined seats of
both caps (2, Figure 97) position two dial gauges (1) with
magnetic base as shown in Figure 97;
B.
proceed as described in point ”1”;
C. after eliminating the end float further tighten the two
adjustment lock rings (4) 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).
Adjust the axial clearance between the teeth of the pinion -
crown wheel unit which must be 0.25 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.
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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.
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19453
Figure 99
Figure 100
Figure 101
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
previously.
19451
Figure 102
Figure 103
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
AXLES IN TANDEM MERITOR RP 160 E (R 2478) (INTERMEDIATE)
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Figure 104
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
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CORRECTING THE CROWN WHEEL AND PINION CONTACTS (AFTER ASSEMBLY)
Figure 105
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
AXLES IN TANDEM MERITOR RP 160 E (R 2478) (INTERMEDIATE)
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