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Reel Mowers 29
Toro University Technical Training
Bench Set vs. Effective H.O.C.
There can be a significant difference between a
bench set height of cut and the actual height of cut
when in the turf.
The bench set height of cut, is theoretical, based on
the assumption that the rollers will set at the same
place in the grass and that the turf is firm.
The turf can have varying densities. Different cutting
unit models can weigh more or less and the rollers
do not always set in the grass in the same manner.
In the circle above you see that after the grass is cut,
the remaining grass must make it under the bedknife.
Effective H.O.C.
and Bedknife Selection
HOC
Blade clearance
After the grass is cut, the remaining grass must make
it under the bedknife. There is not a lot of room for
that to happen.
If there is too much grass under the bedknife, it can
lift up on the knife causing rifling or the appearance
can vary due to the rollers lifting from the turf as the
bedknife becomes the support and pivot point for the
cutting unit.
On the other hand, if we have too thin of a knife or
the height of cut is set higher; there may not be
enough grass to aid in heat dissipation.
As you can see, selecting the proper bedknife for
your height of cut and turf conditions is important.
Bedknife selection will be discussed in more detail
later in the program