NMC-WOLLARD MB-4 200-DF, Operation, Maintenance And Parts Manual

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NOTE: Position wheels straight ahead be-
fore selecting steering mode.
2. Position selector valve lever, located to
the right of the shift control to select de-
sired steering mode. See figure 2-5.
3. Release the foot brake and depress the
accelerator pedal slowly and evenly. As
the tractor starts to move and increase
speed, move the transmission lever up
through the gears as engine rpm’s in-
crease. Do not over-rev or lug down the
engine.
4. When towing, allow tractor to deceler-
ate by releasing accelerator pedal be-
fore applying foot brake. It may be
necessary to use the trailer hand brake
in some cases. Apply the hand trailer
brake only when conditions warrant.
Secure the towing pintle
before moving the load.
When driving or towing, avoid the ten-
dency to oversteer and turn too sharply.
Allow enough clearance for the towed
load.
2.6 STEERING MODE SELECTION &
OPERATION
NOTE: Always be sure the wheels are
aligned with the tractor before selecting a
steering mode.
The operator has a choice of operating in
any of the three steering modes. By posi-
tioning the selector switch located to the
right of the dash panel, he may choose the
coordinating mode (COOR) which will auto-
matically steer the rear wheels as he oper-
ates the steering wheel. The action of the
rear wheels is proportional and opposite of
the action of the front wheels to give the
shortest turning radius.
NOTE: The front wheels are controlled by
the steering wheel in all three modes.
The operator may select to operate the
tractor in the two wheel (2W) or front steer-
ing mode. THE REAR WHEELS MUST BE
TURNED STRAIGHT AHEAD PRIOR TO
SELECTING THE TWO WHEEL
STEERING MODE. This will insure that the
tractor will “track” properly.
The third position of the steering selector
valve allows the driver to steer the rear
wheels in the same direction as the front
wheels (CRAB). This steering mode is used
for accurate positioning for trailer hook-up
or for crab steering around or away from
obstacles.
Before switching steering modes, the driver
must check the front and rear wheels to
make sure that the wheels are positioned
straight and ahead. The wheels must be
aligned straight ahead when changing
steering modes to synchronize the front and
rear axles. This will give the proper perfor-
M200 MB4 Tow Tractor Manual No. 42975
PAGE 2-6
JULY 31, 2004
FIGURE 2-5. STEERING MODE
SELECTOR SWITCH