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38 Reel Mowers
Toro University Technical Training
Sharpening Methods
• Maintain proper ADJUSTMENT
• BACKLAP the bedknife and reel
• GRIND the reel and bedknife
There are several methods that may be used to
sharpen a cutting unit. The one that you choose will
depend upon the condition of the cutting unit. It
should also make the most sense for the anticipated
use. For example, if you are about to cut greens that
have been core aerated or top dressed, you may
not want to grind the reels and install new bed
knives.
By backlapping regularly, reel blade and bedknife
sharpness can be maintained longer between
grindings.
Backlapping cannot be used to sharpen a dull reel
or bedknife. Backlapping is an edge maintenance
practice.
As the reel blades run against the bedknife during
backlapping, a slight burr will appear at the front
cutting edge surface the full length of the bedknife.
Run a file or facing grinder across the front edge to
remove this burr.
Backlapping must be done after single blade
grinding. This is done to establish a land area and
to insure a perfect match between the bedknife and
the reel edge.
Backlapping is not intended to be a reconditioning
process to correct severely nicked or rounded
blades, rifling or taper. If, after approximately 5
minutes of lapping, the edge is not restored, it is
time to grind the reel and bedknife.
Backlapping is often a regularly scheduled
maintenance process, particularly with greens
mowers.