CUTTING UNITS
4203781 First Edition 8-9
8
Definition of Terms
The following terms are used to describe various cut
appearance symptoms.
Washboarding
NOTE: 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 in. (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.
Washboarding may also be caused by variations in the
turf.
Probable Cause Remedy
Mowing (ground) speed is too fast. Reduce mowing (ground) speed.
Improper tire pressure. Set front machine tires at 16–20 psi (110–138 kPa), rear machine
tires at 10–12 psi (69–83 kPa), and caster tires at 20–25 psi
(138–172 kPa).
Mowing in the same direction. Change mowing direction regularly.
Incorrect weight transfer adjustment, cutting units have too much
or too little weight on them.
Use weight transfer knob to transfer weight on or off cutting units.
(See “Weight Transfer Adjustment” on page 5-31.)
Insufficient engine speed, not set to specification. Check/adjust engine speed. (Refer to “Safety, Operation, and
Maintenance Manual.”)
Hydraulic system and/or rotary drive motor performance is
reduced.
Check hydraulic system performance (pump output, motor
operation, valve operation, relief valve settings, etc.). (See
“Instrument Test Procedure” on page 6-27.)
TN0159
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