Textron JACOBSEN R-311 69166, Technical/Repair Manual

Page: 350 / 402

CUTTING UNITS
4203781 First Edition 8-15
8
Mismatched Cutting Units
NOTE: Arrow indicates direction of travel.
Mismatched cutting units cause a pattern of varying
cutting heights, resulting in a stepped cut appearance,
usually due to a different HOC (height-of-cut) adjustment
from one cutting unit to another.
Probable Cause Remedy
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).
HOC inconsistent from one cutting unit to another. Check/adjust HOC on cutting units to same height. (Refer to
“Safety, Operation, and Maintenance Manual.”)
Check condition of deck and/or frame. Repair or replace as needed.
Difference in rotary cutting unit speeds. Check operation of rotary cutting motor(s) and repair/replace as
necessary. (See “Cutting Unit System Test” on page 6-25.)
Tire mats down grass before it is cut. Change mowing direction often. Also check tire pressure.
Difference in mower ride height, side to side. Check/adjust for even mower weight distribution. (Refer to “Safety,
Operation, and Maintenance Manual.”)
TN1278