Rifling Or Tramlining; Mismatched Cutting Units - Jacobsen Fairway 250 JGZZ250 Operation And Maintenance Manual

12.8

RIFLING OR TRAMLINING ___________________________________________

NOTE: Arrow indicates direction of travel.
Possible Cause
The reel or the bedknife are worn at different levels.
The bedknife screws are not included or loose, or
over tightened.
The cut (ground) speed is higher than normal.
12.9

MISMATCHED CUTTING UNITS _______________________________________

NOTE: Arrow indicates direction of travel.
Possible Cause
HOC is different from one cutting unit to another cut-
ting unit.
Difference in mower ride height side to side.
12 QUALITY OF CUT
Rifling or tramlining is a pattern of different cutting
heights, that causes a cut appearance like a wave.
The cause of rifling can be a heavy contact point
across a reel or a bedknife.
Solution
Inspect the bedknife and reel. Sharpen or replace
the reel and bedknife as necessary.
Install, replace or tighten the bedknife screws to the
correct torque setting.
Decrease the cut (ground) speed.
Mismatched cutting units is a pattern of different cut-
ting heights, that give the grass a stepped appear-
ance. This appearance is normally because of a
mismatched HOC (height-of-cut) adjustment from
one cutting unit to another unit.
Solution
Check and adjust HOC on cutting units.
Check and adjust the pressure of the tyres.
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