Range Rover Classic
BORG WARNER
1
DESCRIPTION AND OPERATION
DESCRIPTION
The Borg Warner transfer gearbox incorporates a
single epicyclic gear set which is driven by the main
gearbox output shaft to provide high, neutral or low
gear ratios.
With high or low gear selected, power is transmitted
by a Morse Chain to the front and rear output shafts
via a differential and a limited slip viscous unit.
The gear lever allows neutral, high or low to be
selected. A differential lock is not necessary as this
function is automatically performed by the viscous
coupling unit.
Lubrication is by a low pressure plunger type oil
pump, driven by the epicyclic gear set. Oil is delivered
to the gears and bearings via oilways in the
components.
The viscous coupling though partly immersed in
lubricating oil, is a self contained and sealed unit.
Illustration RR3548M showing the component parts of
the transfer box, is a useful cross reference when
studying the following power flow diagrams.
1. Epicyclic gear set
2. Morse chain
3. Differential
4. Viscous unit/front output shaft
5. High,neutral,low selection sleeve
6. Rear output shaft