How to use the
TRANSFER GEARBOX. Copied from the Disco 1 user manual.
The second gearbox (known as the transfer
box) is used to select either the high or low
range of gears and, in addition, also controls
the central differential (known as the DIFF
LOCK).
High range (H)
The high range of gears should be used for all
normal road driving and also for off-road
driving across dry, level terrain.
Low range (L)
Use low range gears in any situation where
low speed manoeuvring is necessary, such as
reversing a trailer or negotiating a boulder
strewn river bed; also for more extreme
off-road conditions where progress in high
range cannot be maintained.
WARNING
DO NOT attempt to change to LOW range
gears for normal road driving.
Diff lock central differential
Use the unlocked position for all normal
driving, and use the DIFF-LOCK position to
improve traction in extreme conditions where
wheel grip could be lost, such as: wet grass,
mud, sand, ice or snow. Return to the
unlocked position as soon as dry, firm,
ground is reached.
DO NOT use the diff lock unnecessarily!
USING THE TRANSFER GEARBOX
There are two ways of operating the transfer
gearbox lever; the normal method -
recommended for inexperienced drivers - and
the advanced method for experienced
drivers.
Normal method
Manual models:
With the vehicle stationary and the engine
running, depress the clutch and then move
the lever fully forward (or backwards) in TWO
distinct but positive moves - high to
neutral.... neutral to low (or vice versa).
If there is resistance to the gear engaging, do
not force the lever. Instead, with the main
lever in gear, release the clutch momentarily
and then try again.
Automatic models:
With the vehicle stationary and the engine
running, apply both foot brake and handbrake
and then move the automatic gearbox selector
to the N (neutral) position before moving the
transfer lever fully forward or backwards to
the required position.
Advanced method
Changing from high to low on the move:
With the vehicle slowing to a stop and
travelling NO FASTER THAN 5 km/h (3 mph),
depress the clutch and push the transfer lever
into neutral. Just before the road wheels stop
turning (and with the clutch still depressed)
push the lever fully forward into L (low).
NOTE:
Use positive and confident moves, but
do not rush the gear change.
Changing from low to high on the move:
Changing from L (low) to H (high) can be
achieved without stopping the vehicle, as
follows:
1.
Apply slight backward pressure to the
transfer gear lever in preparation for
changing.
2.
Then, in three simultaneous moves,
depress the clutch, release the accelerator
and pull the transfer lever into neutral.
3.
Release the clutch pedal for approximately
3 seconds before depressing it again and
moving the transfer lever firmly into the
high position.
4.
Finally, select a suitable main gear, release
the clutch and continue driving in the
normal way.
NOTE:
After a little practice, this operation
can be carried out smoothly and quickly by
using firm, positive moves.
On automatic models, reduce (or increase) the
speed of the vehicle to 8 km/h (5 mph) and
release the accelerator. Select N and move
the transfer lever quickly to the required H or
L position. Finally, reselect D with the main
gear selector and continue driving as normal.
THE DIFFERENTIAL LOCK
Unlike many four wheel drive vehicles, all
Land Rover products have permanent four
wheel drive. This is achieved by the inclusion
of a lockable differential between the front and
rear drive shafts. With the differential locked,
the drive shafts to front and rear axles are (in
effect) joined together, causing both to rotate
at the same speed. This is a normal feature
with all four wheel drive vehicles and
enhances traction on difficult off-road
surfaces. However, with the differential
unlocked the different running requirements
of the two axles can be accommodated,
thereby enabling Land Rover vehicles to
operate permanently in four wheel drive for
both road AND off-road use.
Selecting diff lock
The diff lock can be engaged or disengaged
either with the vehicle stationary, or when
driving at any road speed. However, with the
vehicle in motion it is ESSENTIAL to be
travelling on firm ground, in a straight line,
and without wheel slip.
WARNING
DO NOT engage the diff lock if one or more
wheels are slipping - this could damage the
transmission. If wheels are slipping, ease
off the accelerator before engaging the diff
lock.
To lock the differential:
Move the transfer gear lever to the left - from
either H (high) or L (low) gearbox (the
warning light on the instrument panel will
illuminate).
To unlock the differential:
Move the transfer gear lever to the right - to
either H (high) or L (low) gearbox as
required; when the diff lock disengages the
warning light will extinguish.
When to use the diff lock
As a general rule, the differential should only
be locked in order to drive off-road on loose
and slippery surfaces. ALWAYS unlock the
differential for normal road driving or as soon
as a hard grippy surface is reached whether
high or low gears are selected.
NOTE:
A valuable introduction to off-road
driving, which includes many useful
references to the transfer gearbox and diff
lock, is included in section 7 of the handbook.
WARNING
If the vehicle is driven on normal road
surfaces with the differential locked, the
steering will feel stiff, excessive tyre wear
will occur and the transmission will be
wound up putting excessive strain on the
transmission.
Diff lock warning light
The amber warning light on the instrument
panel illuminates when the diff lock is actually
engaged - rather than when it has been
selected. Similarly it will only extinguish when
the diff lock is actually disengaged. This
accounts for a slight delay between diff lock
deselection and the warning light
extinguishing, which is quite normal.
IMPORTANT INFORMATION
Transmission wind up
If the warning light is obviously reluctant
to extinguish after the diff lock has been
deselected, some transmission wind up
may be present.
Reversing the vehicle for a short distance
and then going forward will usually
unwind the transmission and extinguish
the light and the vehicle can then be
driven as normal. However, if after two or
three attempts to unwind the
transmission the light remains on,
consult your dealer AS SOON AS
POSSIBLE.