Case 580SR Service Manual page 411

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Assemble the adjuster ring nuts (3) and (7) to the
differential support.
Tighten both ring nuts (3) and (7) with special tool
380000406, till the backlash is eliminated and the
differential bearings are slightly preloaded.
Check that the differential bearings are well settled;
if necessary, knock slightly with a soft hammer, in
order to properly set the bearings in position.
Position a magnetic-base dial gauge on the differen-
tial support, so that the feeler stylus touches the sur-
face of one tooth of the ring gear with a 90° angle.
Lock the pinion and move the crown gear alterna-
tively and note the pinion-ring gear backlash, meas-
ured with the comparator.
Repeat the operation on 2 or more points (teeth), ro-
tating the crown gear, so that to obtain an average
value.
Check if the measured backlash value is within the
requested range:
Carry out the adjustment by operating on the ring
nuts with the appropriate tool 380000406.
Adjust the ring nuts (3) and (7), remembering that:
(A)- if the measured backlash is greater than the
given tolerance range, unscrew the adjuster
ring nut (3) and screw in the adjuster ring nut (7)
by the same measure.
(B)- if the measured backlash is less than the given
tolerance range, unscrew the adjuster ring nut
(7) and screw in the adjuster ring nut (3) by the
same measure.
SECTION 25 - FRONT AXLES
0.18÷0.25 mm
7
A
B
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59
3
F27292
F27293
F27294
A
B
F27295