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28 Reel Mowers
Toro University Technical Training
On DPA cutting units, bedknife angle and behind
center distance are maintained as the reel wears.
This keeps the attitude, or aggressiveness,
consistent throughout the life of the bedknife and
reel.
As you can see, the reel diameter gets smaller as the
reel wears. Note that all cutting units have a specified
wear limit diameter for the cutting reel. The reel must
be replaced when this wear limit is reach. A chart,
with this, and other specifications is provided later in
this program.
Rollers Parallel
to Reel
To achieve an acceptable quality of cut the rollers
must be parallel to the reel. Before adjusting roller
parallelism check for loose roller bearings. Adjust or
replace the bearings as necessary. First parallel the
front, or rear roller, which ever is not used for setting
the height of cut. This paralleling roller is set to match
the reel using a surface plate fixture. With the reel
blades resting on a raised bar on the plate, use a
feeler gauge along the bottom of the roller between
the roller and plate.
Newer DPA model cutting units, with a rigid, bolted
frame, normally do not require this procedure.
Height of Cut
(H.O.C.)
Set the height of cut to the desired height using an
accurate tool. This procedure must be done exactly
the same on each cutting unit. Before doing this
adjustment the bedknife and roller, the one not used
for height of cut adjustment, must be parallel to the
reel, as described on previous pages.
As reel cutting unit design and configuration continue
to evolve, height of cut settings may need modifying
to retain visual and playability goals.
Remember, the setting you are making here, the
“bench set height of cut”, is different from the
effective or actual height of cut in the turf