Borg Warner Transfer Box: Description and Operation
TRANSFER BOX
6
DESCRIPTION AND OPERATION
High and Low Range
High and Low range are selected by the driver from
a dashboard mounted switch on manual vehicles
and via the selector lever on automatic vehicles.
Transfer neutral is selected by inserting a 5 Amp
fuse in position 11 of the driver’s seat fuse box.
Refer to Owner’s Handbook.
Drive from the main gearbox is permanently
engaged to the sun gear of the epicyclic gear set.
When in High range (position B) the sun gear
transmits drive directly to the reduction hub. The
reduction hub and intermediate shaft rotate at the
same speed as the main gearbox output shaft.
When in Low range (position A) the reduction hub is
driven through the planet carrier. The reduction hub
and intermediate shaft rotate at a lower speed than
the gearbox output shaft. When in transfer neutral,
the reduction hub is positioned between the sun
gear and planet carrier.
Changing between ratios is achieved by the
reduction hub sliding along a splined section of the
intermediate shaft to engage with the required gear.
The ratio change mechanism comprises the ratio
control motor, reduction hub, interlock spool and
selector fork.
The interlock spool consists of a shaft which locates
in the front casing and protrudes through the rear
casing to engage with the ratio control motor. The
shaft carries an aluminium casting with a helical cam
track and two springs, which are anchored at one
end to the shaft and at the other to the cam track
casting.
