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68OM-06/03
16
OPERATION
K. Ignition Switch (Model 68 DL shown)
ALWAYS SHUT OFF THE ENGINE
AND REMOVE THE KEY BEFORE
LEAVING THE MOWER SEAT.
The 68 DL ignition
switch is located on
the instrument
cluster. It is a three-
position switch.
Turn the key
clockwise to the
middle position to
activate the electrical
system. Turn the key
to the full clockwise
position to start the
engine. Turn the switch counterclockwise to shut off the
engine.
The 68 SR ignition switch (not shown) is located on the
steering column. It is a two-position switch.
Turn the key clockwise to activate the electrical system
and allow the engine to be started. Turn the switch
counterclockwise to shut off the engine.
L. Differential Shift Lever
Never shift while machine is in mo-
tion, as damage to the gears could
result. Always disengage engine clutch before attempt-
ing to shift.
Located on
the mower
differential,
this control
has three po-
sitions: For-
ward, Neu-
tral (center
position),
and Re-
verse. The
lever must be
pulled to-
ward the cen-
ter of the machine to clear the notch in the stop disc and
positioned securely in the new notch.
M. Parking Brake Lever
Provides a lock for the brake. Push brake lever forward,
over center, to lock. Pulling brake lever back, toward the
rear of the machine will disengage the brake.
N. Service
Brake
Depress the Ser-
vice Brake foot
pedal to slow the
mower and lock
the rear wheels
in the full stop
position.
Note: It is best to
slow the mower
with the throttle and then disengage clutch lever before
applying brake. This prevents excessive wear and engine
overload.
SAFETY SWITCHES
Your National 68 mower is equipped with safety switches
to monitor the operating conditions of certain machine
functions and stop the mower whenever unsafe conditions
are found.
It is necessary for both the main engine clutch and the
wing cutting unit clutch to be in their neutral position to
start the engine. The 68 DL also requires the operator be
in the seat. The 68 SR does not require the operator to be
in the seat to facilitate use of the hand recoil starter.
If you encounter difficulties starting the mower’s engine,
or keeping it running, check the chart in the Safety
Switches section of this manual to make sure you are not
causing the engine to kill or become unable to start.
CAUTION
WARNING