8-4 4157082 First Edition
CUTTING UNIT
8
Definition of Terms
The following terms are used to describe various cut
appearance symptoms.
Washboarding
NOTE: One cutting unit width shown. Arrow indicates
direction of travel.
Washboarding is a cyclical pattern of varying cutting
heights, resulting in a wave-like cut appearance. In most
cases, the wave tip-to-tip distance is approximately 6—
8 inches (15—20 cm). Color variation (light-to-dark) may
also be noticed.
This condition is usually caused by a rocking motion in
the cutting unit(s). This condition is found mostly on
mowers with multiple (suspended) cutting units, but other
causes in walk-behind mowers can produce the same
result.
Washboarding may also be caused by variations in the
turf.
Probable Cause Remedy
Mowing (ground) speed is too fast. Reduce mowing (ground) speed.
Grass build-up on roller. Clean the roller and use scrapers or brushes.
Roller is out of round. Replace front roller. (See “Front Roller—Solid Tube and
Segmented” on page 10-9.)
Mowing in the same direction. Change mowing direction regularly.
Use of a groomer on cleanup pass. Groomers should only be used in a straight line.
TN0159
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