Differential Control - New Holland TC21D Operator's Manual

DIFFERENTIAL CONTROL

The differential lock pedal, 1, is located on the
left-hand foot platform on HST tractors and
right-hand foot platform on gear tractors. The
differential lock is used to obtain additional traction in
wet or loose soil.
When the differential lock pedal is depressed, both
final drive pinion gear shafts are locked together,
preventing one wheel from rotating independently of
the other.
Whenever one wheel begins to slip in wet or loose
soil, use the lock to obtain additional traction from the
opposite wheel.
WARNING
Steering the tractor is very difficult with the
differential locked.
Do not engage the differential lock when driving
the tractor on the highway, when ground speed
is above 8 kph (5 mph), or when turning the
tractor. If the lock is engaged when turning, a
loss of steering control will result.
To operate the differential lock, depress and hold the
pedal down until the lock is positively engaged. It is
best to engage the lock while the wheels are turning
slowly to minimize shock loads to the driveline. If a
wheel spins at high speed, such as on ice, reduce
engine speed to idle before engaging the lock or
damage may result. Release the pedal to disengage
the differential lock.
NOTE: In some instances, the lock may remain
engaged after the pedal is released. This can occur
if one rear wheel is turning at a faster speed than the
other. The lock can be disengaged in one of two ways
if this occurs.
Decrease the drawbar pull by raising or
•
disengaging the implement so that neither wheel
tends to slip.
Rapidly apply and release a light braking load to
•
the slipping rear wheel.
SECTION 2 - OPERATION
19983658
2-13
1
HST
25
1
GEAR
26