Textron Jacobsen InCommand PGM 22 Technical/Repair Manual page 111

Rifling or Tramlining
NOTE: One cutting unit width shown. Arrow indicates
direction of travel.
Probable Cause
Reel and/or bedknife unevenly worn.
4157082 First Edition
Rifling or tramlining is a pattern of varying cutting heights,
resulting in a wave-like cut appearance, usually due to
heavy contact points across the reel and/or bedknife.
TN0987
Inspect bedknife and reel. Grind or replace as needed. (See "Reel
and Bedknife Inspection" on page 8-13.)
CUTTING UNIT
Remedy
8
8-11