Quality Of Cut 6; Quality Of Cut Troubleshooting; Washboarding; Step Cutting - Jacobsen 68098 Handbuch

6 QUALITY OF CUT
6.1

QUALITY OF CUT TROUBLESHOOTING _______________________________________

It is recommended that a "test cut" be performed to evaluate
the mower's performance before beginning repairs.
An area should be available where "test cuts" can be made.
This area should provide known and consistent turf
conditions to allow accurate evaluation of the mower's
performance.
Another "test cut" should be performed after the completion
of the repairs and/or adjustments to verify the mower's
performance.
6.2

WASHBOARDING__________________________________________________________

NOTE: Arrow indicates direction of travel.
Probable Cause
Mowing (ground) speed is too fast.
Grass build-up on roller.
Roller is out of round.
Mowing in the same direction.
Cutting units have too much or too little weight on them.
Insufficient engine speed, not set to specification.
Hydraulic system and/or rotary drive motor performance is
reduced.
6.3

STEP CUTTING____________________________________________________________

Before performing a "test cut" to diagnose cut appearance
and mower performance, the following items should be
verified to ensure an accurate "test cut."
1. Mowing (Ground) Speed
2. Blade Sharpness
3. Height-of-Cut (HOC)
4. Roller and Roller Bearing Condition
5. Blade Speed
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.
TN0159
Reduce mowing (ground) speed.
Clean the roller and scraper.
Replace roller.
Change mowing direction regularly.
Use weight transfer switch to transfer weight on or off cutting units.
(Refer to Parts & Maintenance Manual.)
Check/adjust engine speed. (Refer to Parts & Maintenance Manual.)
Check hydraulic system performance (pump output, motor operation,
valve operation, relief valve settings, etc.).

QUALITY OF CUT 6

Remedy
en-21