Honda HRZ216TDA Harmony II Owner's Manual page 22

OPERATION
Caster Wheel Lock Lever (HRZ)
Use the caster wheel lock lever to hold the front wheels in the straight
ahead direction. The lock lever can be moved anytime while moving
forward; however, if the lever is difficult to move to the RELEASE
position, do not force it. Push down on the handlebar enough to raise
the front wheels off the ground to release pressure on the locking pins.
Then move the lever to the RELEASE position.
The LOCK position must be used when mowing across slopes or when
straight cutting paths are desired. The RELEASE position is
recommended for maximum maneuverability on level terrain.
CASTER WHEEL LOCK LEVER RELEASE POSITION LOCK POSITION
With the lever in the RELEASE position, push the mower forward then
move the lock lever to the LOCK position. This will lock the wheels in
the trailing position and prevent the wheels from getting locked in the
leading position.
If the wheels are locked in the leading position cut quality may suffer
and additional stress may be transferred to the mower causing mower
damage.
TRAILING
LEADING
POSITION
POSITION
(correct)
(incorrect)
NOTICE
If the mower is operated with the front wheels locked in the leading
position, mower damage may result.
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