Jacobsen AR3, Техническое руководство по ремонту

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8-16 4181384 First Edition
CUTTING UNITS
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, but other
causes 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 roller. (See “Front Roller” on page 8-42.)
Mowing in the same direction. Change mowing direction regularly.
Use of a groomer on cleanup pass. Groomers should be used only in a straight line.
Cutting units have too much or too little weight on them. Use weight transfer switch to transfer weight on or off of the cutting
units. (Refer to “Safety, Operation, and Maintenance Manual.”)
Insufficient engine speed. Check/adjust engine speed. (Refer to “Safety, Operation, and
Maintenance Manual.”)
Hydraulic system or reel drive motor performance is reduced. Check hydraulic system performance (pump output, motor
operation, valve operation, relief valve settings, etc.) and
repair/replace as necessary. (See “Cutting Unit/Charge Pump
Test” on page 6-31.)
TN0159