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DESCRIPTION AND OPERATION
Differential assembly
The differential assembly is supported at the front
and rear by taper roller bearings, the bearing outer
tracks being located in the front and rear output
housings. Bearing pre-load is achieved by means of
a selective shim located in the front output housing.
The differential rear shaft carries the low range gear,
high/low selector sleeve and hub, high range gear
and bush and the differential rear bearing; these
components being secured to the shaft by a special
nut.
The differential assembly comprises front and rear
half carriers with integral shafts and sun and planet
gears mounted on cross shafts within the half
carriers. Dished, non-selective thrust washers
control the engagement of the planet gears with the
sun gears whilst selective thrust washers are used
to control the engagement of the sun gears and load
to turn of the differential. The differential carrier
halves are bolted together, a retaining ring providing
positive location of the cross shafts.
The high/low selector shaft and fork are located at
the side of the differential, movement of the shaft,
fork and selector sleeve being controlled by the
high/low selector finger. A spring loaded detent ball
fitted in the main casing, locates in grooves in the
shaft.
For certain markets, a neutral warning lamp switch
operated by the high/low selector shaft and an
interlock solenoid are fitted in the main casing.
Front output housing assembly
The front output shaft is supported in the front output
housing by a single bearing and is splined into the
differential front shaft.
The high/low cross shaft is located in a housing
bolted to the top of the output housing and is
connected to the high/low selector finger which
locates in a slot in the selector shaft.
The differential lock selector housing is also bolted
to the top of the front output housing, the selector
finger passes through the housing, locating in a slot
in the differential lock selector shaft. The differential
lock selector shaft passes through the selector fork
which is located beneath a plate bolted to the side of
the output housing. A spring loaded detent ball fitted
in the output housing locates in grooves in the shaft.
A differential lock warning lamp switch, operated by
movement of the selector fork and shaft is screwed
into the top of the output housing.
Range Rover Classic only
- For certain markets, a
neutral warning lamp switch operated by the
high/low cross shaft is screwed into the side of the
housing.
Rear output housing assembly
The rear output shaft is supported in the rear output
housing by a single bearing and is splined into the
differential rear shaft. The output shaft also carries
the speedometer drive gear which meshes with the
driven gear located in the rear output housing.
Lubrication
Lubrication is by splash, oil filler/level and drain
plugs being located in the main casing. An oil
temperature switch is also fitted for certain
applications.