Final epicyclic reducer
Disassembling the hub
1 - If the operation involves the bevel gear pair, removal is enabled
simply by extracting the two hub swivel pins; the hub can then be
distanced together with the halfshaft.
2 - If the operation involves the hub, proceed as follows:
— remove the protective cap located at the centre of the epicyclic
housing.
— remove the circlip from its groove.
— fit puller p/n 5.9030.618.4/10 and remove the flange (see fig
9).
— remove the circlip from the groove at the end of the halfshaft.
— screw two bolts into the holes indicated by the arrows (see fig
9) and separate the hub from the epicyclic housing.
WARNING: Use a non-ferrous metal hammer and punch to tap
on ferrous parts for removal if necessary.
Stripping down the epicyclic
Remove the ten securing bolts from the flange of the housing, then
remove the flange and the shims beneath.
Rest epicyclic reducer A on two wooden blocks as shown in figure
and using a press and a punch operate on planetary carrier case
centre B until the planetary carrier, bearing C and seal ring D can
be removed from the bottom.
NOTE: If oil leaks are noticed from seal ring D, this ring can be
removed from its groove without requiring the planetary carrier
case to be dismounted.
In any case, when seal ring D is removed the damage it usually
has to undergo is to such an extent to require replacement.
Tap with a hammer and a punch on bearings C and E when having
to remove, if necessary.
Take planetaries A securing pins B; remove the planetaries and
take roller cages C.
Installation
Re-install the disassembled bearing C (Fig.10), in the planetary
carrier case paying attention to the assembly direction.
Install planetaries B with bearings C (Fig.11) into the planetary
carrier case taking care to turn the pin dogs towards the hub
centre.
Make the planetary and the crown wheel teeth match avoiding any
damaging when inserting the planetary carrier into the external
case.
Install bearing C if previously disassembled, use a hammer and a
punch to tap slightly and evenly on the outer race surface.
Shimming epicyclic reducer bearings
Fit a number of shims between the planetary carrier flange and
the pin fixing plate, until the bearing rotate freely, even though a
slight bearing preloading can be felt, then remove one 0.05 mm
shim from the shim pack.
Fit a new seal ring .
Fig. 9 - Removing the hub flange with SAT no.
5.9030.618.4/10 tool.
Fig. 10 - Disassembling the epicyclic reducer.
A - Epicyclic reduction gear
B - Planetary carrier case
C - Bearing
D - Seal ring
E - Bearing
Fig. 11 - Epicylic reduction gear planetaries.
A - Pins
B - Planetaries
C - Roller cage
drive axles - axles
4-W.D. front axle
43
4
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