Front Differential - L322 Range Rover System Description and Operation (Page 245)
FINAL DRIVE
51-6
DESCRIPTION AND OPERATION
Front Differential – Sectional View
1 Crown wheel gear screw (10 off)
2 Planet gear
3 Taper roller bearing
4 Sun wheel (RH drive shaft output)
5 O-ring seal
6 Roll pin
7 RH casing
8 Input flange
9 Pinion nut
10 Oil seal
11 Taper roller bearing
12 Collapsable spacer
13 Taper roller bearing
14 Pinion gear
15 Planet gear
16 Oil seal
17 Taper roller bearing
18 Sun wheel (LH drive shaft output)
19 Shaft
20 Crown wheel drive gear
21 LH casing
22 Carrier.
The differential comprises a pinion shaft and hypoid bevel gear, a crown wheel drive gear with an integral cage which
houses two planet gears. Two sun wheels are also located in the cage and pass the rotational drive to the drive shaft
shafts.
The pinion shaft is mounted on two opposed taper roller bearings with a collapsable spacer located between them.
The spacer is used to hold the bearings in alignment and also collapses under the pressure applied to the pinion nut.
This allows the nut to be tightened to a predetermined torque, which collapses the spacer, setting the correct bearing
preload.
The pinion shaft has an externally splined outer end which accepts and locates the input flange, which is retained by
the pinion nut. The opposite end of the output flange has an internal spline which provides positive location for the
front propeller shaft. The flange has an external O-ring seal which seals against the front propeller shaft shroud
preventing the ingress of dirt and moisture into the splines. An oil seal is pressed into the LH casing and seals the
input flange to the differential unit. The pinion shaft has a hypoid bevel gear at its inner end which mates with the crown
wheel drive gear.
The crown wheel drive gear is located on the carrier and secured with ten screws. The carrier is mounted on taper
roller bearings located in each casing half. The bearings are press fitted into the casing and a spacer is located on
the outside face to apply preload to the bearing.
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