S0602170K
Page 103
Axle (ZF AP 420R)
3. Screw in adjusting nut (opposite the crown
wheel side) until the differential bearing
has no endplay.
4. Now, tighten adjusting nut further for 2
notches to obtained the required bearing
preload of the differential bearing 3 - 4 Nm
(26.5 - 35.4 in lb).
5. Check backlash again and correct if
necessary.
NOTE:
At this step make several
revolutions of the differential.
Determine yoke width.
6. Attach dial indicator on the plane face/
crown wheel, make at least one revolution
of the crown wheel and record the run-out.
NOTE:
Admitted run-out max. 0.08 mm
(0.0031 in).
NOTE:
See “Special Tools” on page 15.
7. Check contact pattern on the crown wheel
A. Cover some tooth flanks of the crown
wheel with gear marking compound.
B. Roll the clown wheel over the drive
pinion back and forth.
C. Take the contact pattern and
compare it with “Examples of Gear-
tooth-contact Patterns for the
Gleason Gear-tooth System” on
page 11.
D. In case of a greater contact pattern
deviation, a spacing error has been
made during the reassembly of the
drive pinion, which must be
corrected.
Figure 235
Figure 236
Figure 237
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