Exmark Lazer Z Operator's Manual page 26

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 (For Serial Nos. 370,000 and Higher): 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. 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: (All units except Kohler EFI) Located at lower center of console (right
side of ignition switch). Choke is used to aid in starting a cold engine. The choke
control is pulled out to be in the "ON" position and pushed in to be 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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