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Reel Mowers 37
Toro University Technical Training
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Rifling
Streaks of uncut grass, will appear on the low
areas of a grooved or wavy (rifled) bedknife
When the cutting unit blades become dull and
quality of cut deteriorates, the tendency is to want to
tighten the bedknife to reel contact, resulting in
heavy contact.
Heavy bedknife to reel contact can cause rifling,
which appears as a grooved or wavy wear pattern
on the reel and or bedknife. This condition can only
be corrected by grinding the reel and bedknife.
BACKLAPPING WILL NOT CORRECT THIS
CONDITION. The bedknife will usually need to be
replaced rather than just ground.
Barrel Shaped Reel
A barrel shaped reel, caused by flexing of the
cutting unit frame will also require grinding to bring
the reel back to a cylindrical shape.
It is more likely that this will occur on cutting units
with welded frames and not on the newer DPA
model cutting units with more rigid bolted frames.
Flexing of the frame can cause uneven wear and
eventually lead to rifling.
If the reel wears unevenly, it becomes difficult to
keep the bedknife parallel across the entire width of
the reel. You may be able to pinch paper in the
middle, but not on the ends, or vice-versa. When
adjusting a cutting unit with this condition, the
tendency is to want to tighten the bedknife to reel
contact, so the paper can be pinched and cut
across the entire bedknife and reel, resulting in
heavy contact.
Cone Shaped Reel
Grinding will also be required if the reel is cone
shaped or tapered. Reels eventually become
tapered with use. If the reel is not ground to a
cylinder shape again, a mismatch, in the height of
cut between adjacent cutting units can result.