Exmark Lawn Tractor Operator's Manual page 24

To turn right while moving forward, move the right lever back toward neutral to
slow the right drive wheel.
To make a zero turn to the left, pull the left lever back beyond neutral while
holding the right lever slightly ahead of neutral.
To make a zero turn to the right, pull the right lever back beyond neutral while
holding the left lever slightly ahead of neutral.
Pulling the levers back from the neutral position will cause the respective drive
wheels to rotate in a reverse direction (spring tension can be felt when moving
into reverse from neutral).
To turn to the left while backing, move the left lever forward toward neutral. To
turn to the right while backing, move the right lever forward toward neutral.
POTENTIAL HAZARD
♦ Machine can spin very rapidly by positioning one lever
too much ahead of the other.
WHAT CAN HAPPEN
♦ Operator may lose control of the machine, which may
cause damage to the machine or injury.
HOW TO AVOID THE HAZARD
♦ Use caution when making turns.
♦ Slow the machine down before making sharp turns.
4.1.3 Tracking Adjustment Knob: Located under the seat on the RH pump control
link. Rotating this knob allows fine tuning adjustments so that the machine
tracks straight with the drive levers in the full forward position.
Stop machine and wait for all moving parts to stop. Engage park brake. Unhook
seat latch and tilt seat forward to gain access to the tracking knob. Rotate the knob
clockwise (as viewed from the rear of the machine) to cause the machine to track
more to the right and counterclockwise to cause the machine to track more to the
left. Adjust in quarter-turn increments until the machine tracks straight. Check that
the machine does not creep when in neutral with the park brakes disengaged.
IMPORTANT: Do not rotate the knob too far, as this may cause the machine
to creep in neutral. Refer to section 5.2.13 for control linkage adjustment.
4.1.4 PTO Engagement Switch: Located just left of center on the console (left side of
ignition switch).
Switch must be pulled out to the "ROTATE" position to engage the blades.
Switch is pushed in to the "STOP" position to stop the blades.
4.1.5 Choke Control: Located at lower center on the console (right side of ignition switch).
Choke is used to aid in starting a cold engine. The choke control is pulled out to
put the choke in the "ON" position and pushed in to put the choke control in the
"OFF" position. DO NOT run a warm engine with choke in the "ON" position.
4.1.6 Throttle Control: Located on console just right of center.
Throttle is used to control engine speed. Moving throttle lever forward will increase
engine speed and moving throttle lever to the rear will decrease engine speed.
4.1.7 Brake Lever: Located on left side of unit, just to the front of the console. The
brake lever engages a parking brake on the drive wheels.
Pull the lever up and rearward to engage the brake.
Push the lever forward and down to disengage the brake.
The unit must be tied down and brake engaged when transporting.
CAUTION
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