Amity Technology 2720, Operating Manual

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6.14 Grabroll Bed
Grabroll beds provide the majority of the cleaning action within the harvester. Grabrolls with scroll-
ing provide an aggressive push to beets. Beets are continually turned and flipped over so that the
entire beet is cleaned. Scrolled grabrolls will also thoroughly remove mud and break up dirt clods.
The smooth grabrolls turn slightly faster than the scrolled and provide a wedging action to remove
dirt, tailings, and debris.
6.14.1 Front Grabroll Bed
The front grabroll bed separates trash and dirt from the beets
while transferring beets to the center of the machine and on-
to the jump chains.
The smooth grabrolls are spring mounted to allow relief for
rocks as they pass over the rolls. The bed has several adjust-
ments to optimize cleaning and minimize beet damage. See
sections 7.12, 7.13, and 7.14 for front grabroll spacing and
speed adjustments.
6.14.2 Rear Grabroll Bed
The rear grabrolls provide additional cleaning while
transferring beets to the rear center of the harvester to
discharge them into the scrub.
As with the front grabroll bed, the smooth grabrolls are
spring mounted to allow relief for rocks as they pass
over the rolls. Kickers, welded to the scrolled rolls, kick
the beets to keep them moving on the grabroll bed. The
beets can take full advantage of 75 sq. ft. (6.96 sq. m.) of
cleaning potential. Refer to sections 7.16, 7.17, and 7.18
for adjustments.
6.15 Extended Jump Chain Option
Extended jump chain is an option in lieu of
rear grabrolls. With this option, the jump
chain continues where the grabrolls would be
placed. This option is intended for harvesting
in lighter soils and offers a gentler handling of
the beets.
Figure 6 - 12: Front Grabroll Bed
Figure 6 - 13: Rear Grabroll Bed
Figure 6 - 14: Underside View of Extended Jump Chain