992
Model Code Page
64. Powered front axle
1. 1. 1994
6000--8750 644 10
C. Changing differential gears/crown
wheel
Note! Compare Op. B on page 644/1.
1. Remove the differential unit from the axle housing, see Op.
A paragraphs 1 --- 3 . Mark the halves of the differential carrier
to facilitate reassembling.
2. Unscrew the crown wheel bolts. Knock off the crown wheel.
3. Knock off the locating pins of the crown wheel. Open the
carrier and remove the various components.
4. Check the condition of the housing, differential gears and
bearing plates. Change all damaged parts. Lubricate all parts
with oil.
Note! The differential pinion shaft is lo cked by means of the
locking pin. The diff. pinions thrust---washers are fitted so that
the locking lugs engage in the grooves on the differential
carrier.
5. Reassemble the differential and fit the carrier halves so that
the marks are in the same places as they were before dis-
mantling. Fit the crown wheel and tighten the screws to 70
Nm.
Important! If you change the crown wheel, also the pinion
shaft must be changed. Removing, fitting and adjusting the
pinion shaft, see page 644/3 instr. B and C.
6. Fit the lockingpins. Firstthe bigger pin and then the smaller
pin inside with the split pointing towards the heads of the
screws.
7. Fit the differential, see instr. A paragraphs 10---15.
D. Changing differential be arings
Note! If you change the differential bearings, the bearing
pre---load should be adjusted and also the tooth backlash
between the crown wheel and the pinion shaft should be
adjusted, see instr. D on page 644/5.
1.Removethedifferential,seeinstr.A paragraphs 1 --- 3 .
2. Remove differential bearing outer races from both axle sec-
tions and remove any shims that may be fitted behind the
races.
3. Remove the roller bearings from the differential carrier.
4. Fit new bearings onto the differential carrier.
5. Press outer races against the bearings and use a vernier
caliper to measure the distance between them, measure-
ment D.
6. Read off measurement A (larger upper figure) marked
inside the longer axle housing. This is the distance between
the bottom of the differential bearing location and the axle
housing flange surface.
7. Read off measurement B marked inside the shorter axle
housing. This is the distance between the bottom of the bear-
ing hous ing and the axle housing flange surface.
8. The preload (P) of the differential bearings should be 0, 05
mm. Calculate the number of shims re quired as follows:
S = ( A + B ) --- D + P
9. Fit an equal number of shims under each differential bear-
ing.
10. Fit the differential into the axle housing and connect t he
axle sections with several screws (190 Nm).
11. Measure the pinion/crown wheel tooth backlash using an
indicatorgauge stylus against a screwon thedrive flange.The
backlash should be in the range 0,20---0,25 mm.
12. If the backlash is not correct transfer shims from onebear-
ing race to the other.
Note! If the backlash is too small transfer shims from the
shorter axle section side to the longer side and vice versa.
13. When the backlash is correctly adjusted, fit the differential
unit and reassemble the axle housing, see instr. A paragraphs
10---15.
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