Buhler 2180 - Manual (Page 105)

SECTION 2 - OPERATION
2-59
FOUR WHEEL DRIVE (FWD)
INTRODUCTION
The four wheel drive (FWD) axle comes in either
limited slip differential with Automatic Traction
Management or fully locking differential with Traction
Control System (TCS) Traction Management. Use
FWD Automatic or TCS when operating to obtain
maximum efficiency and traction under any field
conditions.
ENGAGING AND DISENGAGING FOUR
WHEEL DRIVE
Four wheel drive can be engaged and disengaged in
all gears (forward and reverse) during operation and
under full load.
Switch, 1, has three operating positions: Off,
Automatic or TCS and Full-time On.
Fully depress the rear of switch, 1, to disengage
FWD, 2.
Depress the front of the switch one notch to the
Automatic or TCS position, 3. The AUTO FWD
indicator lamp on the instrument console will
illuminate to indicate engagement of either Automat-
ic or TCS.
When the tractor is in Automatic or TCS mode, FWD
will automatically disengage when either brake pedal
is used to assist in turning or at transport speeds
above 24.2 km/h (15 MPH) which reduces tire wear.
The FWD will automatically reengage when
transport speed drops below 24.2 KPH (15 MPH)
and when the applied foot brake is released.
If the tractor is equipped with TCS, the FWD will also
disengage and reengage under the following
conditions:
At speeds of 0-10 kph ( 0-6 MPH) disengage at
turn angles of 30 degrees or higher and
reengage at angles less than 30 degrees.
Or between 10–20 kph ( 6–13 MPH) disengage
at turn angles of 25 degrees or higher and
reengage at angles less than 25 degrees.
Fully depress the front of the switch to the ON
position, 4, to engage full-time FWD. The indicator
lamp in the switch will illuminate to indicate that the
FWD is engaged.
In this mode FWD automatically disengages when
transport speed is above 24.2 KPH (15 MPH) which
will reduce tire wear. FWD will automatically
reengage when speeds drop below 24.2 KPH (15
MPH).
NOTE: FWD will automatically engage to improve
braking any time that both brake pedals are
depressed.
1
2
3
4
93
FWD OPERATING PRECAUTIONS
CAUTION
Four wheel drive greatly increases traction. Extra
caution is needed on slopes. Compared to
two-wheel drive, a fwd tractor maintains traction
on steeper slopes, increasing the possibility of
overturning.
When driving on icy, wet, or graveled surfaces,
reduce speed and make sure the tractor is
correctly ballasted to avoid skidding and loss of
steering control. For best control, engage four
wheel drive by using full-time on mode, rather
than auto mode for four wheel braking.
IMPORTANT: To increase front tire life, disengage
four wheel drive when transporting the tractor.
Disengagement is automatic at transport speeds
above 24.2 KPH (15 MPH). Always use front/rear tire
combinations specified to ensure acceptable tire
wear.
IMPORTANT: Disengage FWD when making
extremely tight turns. This action will increase front
tire life, decrease stress on the FWD axle and allow
tractor to achieve minimum turn diameters.